Updated:May, 2026

10 Best Best Tankless Gas Water Heaters of 2026

Best Choice

9.9

Outstanding

NOVIEEX

Tankless Water Heater, Novieex On Demand Water Heater Natural Gas, Up to 4.3 GPM, 100,000 BTU Instant Hot Water Heater with LED Display, Indoor Installation, 2-4 Point Use for Family Bathroom Kitchen

Why We Love It

Note This 4.3GPM on demand water heater requires natural gas
Reliable Hot Water on Demand With 100,000 BTU power, this on demand water heater delivers up to 4.3 GPM instant hot water. You can comfortably run a shower, kitchen faucet, and bathroom sink simultaneouslyall without any noticeable temperature drop.
Precise Temperature Control Enjoy consistent water temperature with a wide adjustable range from 95°F to 149°F, ±1 temperature control . The built-in digital thermostat of the tankless water heater ensures your water stays at the desired setting, delivering comfort and safety for every shower and household task.
High Efficiency, Lower Bills Say goodbye to the energy and electricity waste of traditional heaters that reheat water nonstop. By leveraging a selectional burner system, our tankless water heater gas precisely adjusts the flame for the water temperature. You will see a noticeable drop in your energy bills, making it an efficient and cost-effective choice.
All-Round Security SystemOur built-in multi-protection system safeguards against gas leaks, overheating, dry-firing, and freeze damage, offering ultimate safety and comfort for families with temperature-sensitive elderly or kids with delicate skin.
Compact & Space-SavingCompared to bulky traditional tanks, our natural gas on demand water heater is wall-mounted, saving over 50% of space and blends seamlessly into utility rooms, basements, or closets. Its sleek appearance and LED touchscreen interface allow for easy and intuitive operation.
Usage Reminder For safe and efficient use, this indoor on demand water heater requires natural gas and professional installation by a licensed technician using 1/2" NPT fittings (Exhaust pipe included).

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Why We Love It

Note This 4.3GPM on demand water heater requires natural gas
Reliable Hot Water on Demand With 100,000 BTU power, this on demand water heater delivers up to 4.3 GPM instant hot water. You can comfortably run a shower, kitchen faucet, and bathroom sink simultaneouslyall without any noticeable temperature drop.
Precise Temperature Control Enjoy consistent water temperature with a wide adjustable range from 95°F to 149°F, ±1 temperature control . The built-in digital thermostat of the tankless water heater ensures your water stays at the desired setting, delivering comfort and safety for every shower and household task.
High Efficiency, Lower Bills Say goodbye to the energy and electricity waste of traditional heaters that reheat water nonstop. By leveraging a selectional burner system, our tankless water heater gas precisely adjusts the flame for the water temperature. You will see a noticeable drop in your energy bills, making it an efficient and cost-effective choice.
All-Round Security SystemOur built-in multi-protection system safeguards against gas leaks, overheating, dry-firing, and freeze damage, offering ultimate safety and comfort for families with temperature-sensitive elderly or kids with delicate skin.
Compact & Space-SavingCompared to bulky traditional tanks, our natural gas on demand water heater is wall-mounted, saving over 50% of space and blends seamlessly into utility rooms, basements, or closets. Its sleek appearance and LED touchscreen interface allow for easy and intuitive operation.
Usage Reminder For safe and efficient use, this indoor on demand water heater requires natural gas and professional installation by a licensed technician using 1/2" NPT fittings (Exhaust pipe included).

How We Find the Top Picks

We use smart data tools to review thousands of products and stores, analyzing ratings, reviews, and popularity trends to highlight what truly matters to shoppers like you.

Our experts then refine the results, blending AI insights with real user experiences to deliver accurate, up-to-date rankings that help you choose with confidence.

9.5

Excellent

LiberLive

Natural Gas Tankless Water Heater, Indoor Max 3.6 GPM, 80,000 BTU On Demand Instant Hot Water Heater Natural Gas with LED Temperature Control Panel, 1/2" NPT Connector Size, Gray

Main Highlights

Powerful On-Demand Heating This tankless water heater gas model delivers 80,000 BTU & 3.6 GPM, supporting 23 water points simultaneously. Enjoy endless tankless hot water heater performance with no waiting perfect for daily household use
Precision Temperature Stability Unlike conventional gas water heater units, our advanced temperature control eliminates sudden hot/cold spikes. Adjustable range ensures consistent warmth, safe for infants, kids, and elders no more unexpected cold blasts
Energy-Efficient & Space-Saving Design This gas tankless water heater cuts standby energy waste (a major flaw of traditional tanks). Features an oxygen-free copper heat exchanger and compact wall-mounted design ideal for apartments, small homes, or tight laundry rooms
All-Round Safety As a leading natural gas tankless water heater, it includes dry burning, overheating, flame-out, CO leakage, and water pressure protection. Powerful fan ensures safe operation. Use with total peace of mind
Easy Compatibility & Professional Installation This tankless gas water heater fits standard 3" OD vents, 120V AC, and 1/2" NPT fittings works with most U.S. homes. Must be installed by a licensed plumber; not recommended above 2,000 ft elevation
Reliable 2-Year Warranty & Full Support Our tankless water heater comes with a comprehensive warranty covering the entire unit. Dimensions: 22.1 x 14.2 x 6.7 inches, LED screen control. Dedicated customer support always ready to assist

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Main Highlights

Powerful On-Demand Heating This tankless water heater gas model delivers 80,000 BTU & 3.6 GPM, supporting 23 water points simultaneously. Enjoy endless tankless hot water heater performance with no waiting perfect for daily household use
Precision Temperature Stability Unlike conventional gas water heater units, our advanced temperature control eliminates sudden hot/cold spikes. Adjustable range ensures consistent warmth, safe for infants, kids, and elders no more unexpected cold blasts
Energy-Efficient & Space-Saving Design This gas tankless water heater cuts standby energy waste (a major flaw of traditional tanks). Features an oxygen-free copper heat exchanger and compact wall-mounted design ideal for apartments, small homes, or tight laundry rooms
All-Round Safety As a leading natural gas tankless water heater, it includes dry burning, overheating, flame-out, CO leakage, and water pressure protection. Powerful fan ensures safe operation. Use with total peace of mind
Easy Compatibility & Professional Installation This tankless gas water heater fits standard 3" OD vents, 120V AC, and 1/2" NPT fittings works with most U.S. homes. Must be installed by a licensed plumber; not recommended above 2,000 ft elevation
Reliable 2-Year Warranty & Full Support Our tankless water heater comes with a comprehensive warranty covering the entire unit. Dimensions: 22.1 x 14.2 x 6.7 inches, LED screen control. Dedicated customer support always ready to assist

9.5

Excellent

APUS

APUS Tankless Water Heater Natural Gas, Up to 4.42 GPM, Indoor Tankless Water Heater, 95,000 BTU on Demand Instant Hot Water Heaters with Smart Digital Display,Space Gray

Main Highlights

Powerful & High-Capacity: This high-performance gas tankless water heater delivers 95,000 BTU heating capacity with 4.42GPM high flow rate, featuring innovative 0.66GPM low-flow start technology. As a versatile natural gas tankless water heater, it meets simultaneous hot water demands for 2 showers plus 1 sink while maintaining stable temperatures even during peak usage.
Precise & Steady: With high-precision sensors and smart CPU technology, this tankless gas water heater maintains water temperature within ±1°F of your desired setting (adjustable from 95°F-140°F). No more sudden hot/cold shocksjust perfectly steady water for showers, washing, and more, even with multiple faucets running. Enjoy worry-free comfort every time!
Efficient & Durable: Featuring oxygen-free copper heat exchangers and innovative segmented combustion technology, this tankless water heater achieves exceptional 85%+ thermal efficiency. Designed for maximum performance, it delivers 30% greater energy savings than conventional tank water heater models.
Compact & Space-Saving: This compact gas water heater saves space without sacrificing performance, featuring an intuitive LED touchscreen and sleek dimensions of just 20.55"H × 13.27"W × 5.91"D. As a tankless gas water heater, it delivers instant hot water on demand while operating at a quiet 36dBquieter than most household appliances.
Built-in intelligent freeze protection automatically activates in low temperatures. Please note: When the ambient temperature approaches or falls below 41°F (5°C) for extended periods, or if the water heater will be unused for a long time, the unit must be completely drained of water to prevent internal components from freezing and cracking.
Safe & Reliable: Our reliable natural gas water heater includes multiple-layer safety protection and a 2-year coverage. This propane tankless water heater automatically shuts down if risks are detected, providing complete peace of mind with its instant, on-demand hot water comfort.

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Main Highlights

Powerful & High-Capacity: This high-performance gas tankless water heater delivers 95,000 BTU heating capacity with 4.42GPM high flow rate, featuring innovative 0.66GPM low-flow start technology. As a versatile natural gas tankless water heater, it meets simultaneous hot water demands for 2 showers plus 1 sink while maintaining stable temperatures even during peak usage.
Precise & Steady: With high-precision sensors and smart CPU technology, this tankless gas water heater maintains water temperature within ±1°F of your desired setting (adjustable from 95°F-140°F). No more sudden hot/cold shocksjust perfectly steady water for showers, washing, and more, even with multiple faucets running. Enjoy worry-free comfort every time!
Efficient & Durable: Featuring oxygen-free copper heat exchangers and innovative segmented combustion technology, this tankless water heater achieves exceptional 85%+ thermal efficiency. Designed for maximum performance, it delivers 30% greater energy savings than conventional tank water heater models.
Compact & Space-Saving: This compact gas water heater saves space without sacrificing performance, featuring an intuitive LED touchscreen and sleek dimensions of just 20.55"H × 13.27"W × 5.91"D. As a tankless gas water heater, it delivers instant hot water on demand while operating at a quiet 36dBquieter than most household appliances.
Built-in intelligent freeze protection automatically activates in low temperatures. Please note: When the ambient temperature approaches or falls below 41°F (5°C) for extended periods, or if the water heater will be unused for a long time, the unit must be completely drained of water to prevent internal components from freezing and cracking.
Safe & Reliable: Our reliable natural gas water heater includes multiple-layer safety protection and a 2-year coverage. This propane tankless water heater automatically shuts down if risks are detected, providing complete peace of mind with its instant, on-demand hot water comfort.

9.2

Excellent

FOGATTI

FOGATTI Natural Gas Tankless Water Heater Outdoor - Max 8.1 GPM 180,000 BTU, CSA Certified Compact Design On Demand Instant Hot Water Heater - Instagas Comfort 180S Series, New Upgraded

Main Highlights

Instant Hot Water: Say goodbye to preheating delays! FOGATTI tankless water heater delivers continuous hot water instantly, powered by 180,000 BTU and up to 8.1 GPM flow rate. Whether its for showers, sinks, or appliances, even for 3-5 outlet points, it ensures uninterrupted hot water
Built for Outdoor Durability: Designed specifically for outdoor installation, this tankless water heater gas features a remote control panel for convenient indoor operation. The bottom-mounted fan enhances safety, durability, and lifespan by preventing smoke backflow and ensuring stable combustion, making it reliable in all seasons
Precision Temperature Control: With advanced water servo technology and temperature sensors, the tankless gas water heater precisely adjusts water flow and gas intake to maintain a temperature difference within ±1. The four-stage combustion system ensures consistent comfort, whether its a chilly winter or a hot summer
Quick and Easy Installation: The compact design measuring 26.2 x 17.1 x 7.1 inches makes installation hassle-free. The gas tankless water heater is compatible with low water pressure from 15-150 PSI, ensuring smooth operation even in areas with weaker water pressure. Simply connect to a standard 120V AC for seamless operation
Trusted Quality and Support: Built with a high-efficiency oxygen-free copper heat exchanger and 304 stainless steel burner, this tankless water heater gas outdoor offers exceptional durability and performance. Certified by CSA and equipped with multiple safety features, it meets the highest safety standards, ensuring reliable and secure operation
Reliable Protection and Support: FOGATTI water heater includes 2 years of full coverage for the entire unit and 5 years of coverage for the heat exchanger. Our dedicated customer support team is ready to assist with any questions or concerns, providing peace of mind for you
Note: Natural gas tankless water heater is equipped with active heating anti-freeze device, If enviroment temp drop below 5 or not be used for long period, drain the water inside to prevent damage. For optimal performance, recommended for use below 2000 feet altitude

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Main Highlights

Instant Hot Water: Say goodbye to preheating delays! FOGATTI tankless water heater delivers continuous hot water instantly, powered by 180,000 BTU and up to 8.1 GPM flow rate. Whether its for showers, sinks, or appliances, even for 3-5 outlet points, it ensures uninterrupted hot water
Built for Outdoor Durability: Designed specifically for outdoor installation, this tankless water heater gas features a remote control panel for convenient indoor operation. The bottom-mounted fan enhances safety, durability, and lifespan by preventing smoke backflow and ensuring stable combustion, making it reliable in all seasons
Precision Temperature Control: With advanced water servo technology and temperature sensors, the tankless gas water heater precisely adjusts water flow and gas intake to maintain a temperature difference within ±1. The four-stage combustion system ensures consistent comfort, whether its a chilly winter or a hot summer
Quick and Easy Installation: The compact design measuring 26.2 x 17.1 x 7.1 inches makes installation hassle-free. The gas tankless water heater is compatible with low water pressure from 15-150 PSI, ensuring smooth operation even in areas with weaker water pressure. Simply connect to a standard 120V AC for seamless operation
Trusted Quality and Support: Built with a high-efficiency oxygen-free copper heat exchanger and 304 stainless steel burner, this tankless water heater gas outdoor offers exceptional durability and performance. Certified by CSA and equipped with multiple safety features, it meets the highest safety standards, ensuring reliable and secure operation
Reliable Protection and Support: FOGATTI water heater includes 2 years of full coverage for the entire unit and 5 years of coverage for the heat exchanger. Our dedicated customer support team is ready to assist with any questions or concerns, providing peace of mind for you
Note: Natural gas tankless water heater is equipped with active heating anti-freeze device, If enviroment temp drop below 5 or not be used for long period, drain the water inside to prevent damage. For optimal performance, recommended for use below 2000 feet altitude

9.0

Excellent

FOGATTI

FOGATTI Natural Gas Tankless Water Heater Indoor - Max 7.5 GPM 170,000 BTU, CSA Certified Compact Design On Demand Instant Hot Water Heater - Instagas Comfort 170S Series

Main Highlights

Powerhouse Performance: The FOGATTI tankless water heater takes up a third of the space of traditional tank heaters but delivers 5 times the performance. With a high heating power of 170,000 BTU and a flow rate of 7.5 GPM, it provides endless hot water on demand, perfect for multitasking households
Instant Heating: Unlike traditional tank heaters, this tankless water heater gas delivers instant and endless hot water as water flows through. Whether its for showers, sinks, or appliances, even for 3-5 outlet points, it ensures uninterrupted hot water whenever you need it
Precision Temperature Control: With advanced water servo technology and temperature sensors, the gas tankless water heater indoor precisely adjusts water flow and gas intake to maintain a temperature difference within ±1. The four-stage combustion system ensures consistent comfort, whether its a chilly winter or a hot summer
Quick and Easy Installation: The compact design measuring 25 x 16.3 x 7.3 inches makes installation hassle-free. Tankless gas water heater is compatible with low water pressure from 15-150 PSI, ensuring smooth operation even in areas with weaker water pressure. Simply connect to a standard 120V AC for seamless operation
Trusted Quality and Support: Built with a high-efficiency copper heat exchanger and 304 stainless steel burner, this water heater offers exceptional durability and performance. Certified by CSA and equipped with multiple safety features, it meets the highest safety standards for reliable operation
Reliable Protection and Support: The FOGATTI natural gas tankless water heater includes 2 years of full coverage for the entire unit and 5 years of coverage for the heat exchanger. Our dedicated customer support team is ready to assist with any questions or concerns, providing peace of mind for you
Note: Important Usage Guidelines: Tankless water heater natural gas is equipped with active heating anti-freeze device, If enviroment temp drop below 5 or not be used for long period, drain the water inside to prevent damage. For optimal performance, recommended for use below 2000 feet altitude

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Main Highlights

Powerhouse Performance: The FOGATTI tankless water heater takes up a third of the space of traditional tank heaters but delivers 5 times the performance. With a high heating power of 170,000 BTU and a flow rate of 7.5 GPM, it provides endless hot water on demand, perfect for multitasking households
Instant Heating: Unlike traditional tank heaters, this tankless water heater gas delivers instant and endless hot water as water flows through. Whether its for showers, sinks, or appliances, even for 3-5 outlet points, it ensures uninterrupted hot water whenever you need it
Precision Temperature Control: With advanced water servo technology and temperature sensors, the gas tankless water heater indoor precisely adjusts water flow and gas intake to maintain a temperature difference within ±1. The four-stage combustion system ensures consistent comfort, whether its a chilly winter or a hot summer
Quick and Easy Installation: The compact design measuring 25 x 16.3 x 7.3 inches makes installation hassle-free. Tankless gas water heater is compatible with low water pressure from 15-150 PSI, ensuring smooth operation even in areas with weaker water pressure. Simply connect to a standard 120V AC for seamless operation
Trusted Quality and Support: Built with a high-efficiency copper heat exchanger and 304 stainless steel burner, this water heater offers exceptional durability and performance. Certified by CSA and equipped with multiple safety features, it meets the highest safety standards for reliable operation
Reliable Protection and Support: The FOGATTI natural gas tankless water heater includes 2 years of full coverage for the entire unit and 5 years of coverage for the heat exchanger. Our dedicated customer support team is ready to assist with any questions or concerns, providing peace of mind for you
Note: Important Usage Guidelines: Tankless water heater natural gas is equipped with active heating anti-freeze device, If enviroment temp drop below 5 or not be used for long period, drain the water inside to prevent damage. For optimal performance, recommended for use below 2000 feet altitude

8.8

Very Good

Rinnai

NEW Rinnai RX199iN Condensing Smart Sense Natural Gas or Propane Tankless Water Heater, Indoor or Outdoor Water Heater, Up to 11.1 GPM, 199,000 BTU

Main Highlights

One Model, Anywhere: This Rinnai tankless water heater is installable indoors or outdoors thanks to our new Versa Vent and powered by either propane or natural gas thanks to a Smart Sense gas control system; RX-OVC vent cap required for outdoor install
Never Run Out of Hot Water with this Compact Tankless Gas Water Heater: This condensing propane and natural gas tankless water heater from Rinnai is only the size of a small suitcase, but provides up to 11.1 GPM (7 fixtures at once)
Smart, Efficient Design: This water heater's modern design includes an easy-to-use interface, Quick Flush feature for simplified flushing, as well as a super-high energy efficiency factor of UEF .98; See Controlr module for WiFi control (not included)
Professional Installation Recommended: Visit the Find a Rinnai PRO page on our website to find a qualified technician to install your tankless water heater, and use the Rinnai Central App for help with setup, service & troubleshooting; We do not recommend installing a water heater without a technician
Find Your Rinnai: See our product guides, manuals, energy guide, warranty information, videos, and tables to find the right tankless water heater size for your home; Check our Ground Water Temperature Map to see if this heater is optimal for your region

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Main Highlights

One Model, Anywhere: This Rinnai tankless water heater is installable indoors or outdoors thanks to our new Versa Vent and powered by either propane or natural gas thanks to a Smart Sense gas control system; RX-OVC vent cap required for outdoor install
Never Run Out of Hot Water with this Compact Tankless Gas Water Heater: This condensing propane and natural gas tankless water heater from Rinnai is only the size of a small suitcase, but provides up to 11.1 GPM (7 fixtures at once)
Smart, Efficient Design: This water heater's modern design includes an easy-to-use interface, Quick Flush feature for simplified flushing, as well as a super-high energy efficiency factor of UEF .98; See Controlr module for WiFi control (not included)
Professional Installation Recommended: Visit the Find a Rinnai PRO page on our website to find a qualified technician to install your tankless water heater, and use the Rinnai Central App for help with setup, service & troubleshooting; We do not recommend installing a water heater without a technician
Find Your Rinnai: See our product guides, manuals, energy guide, warranty information, videos, and tables to find the right tankless water heater size for your home; Check our Ground Water Temperature Map to see if this heater is optimal for your region

8.6

Very Good

APUS

APUS Natural Gas Tankless Water Heater 140,000 BTU Indoor Installation Up to 6.8 GPM, Zero Cold Water for Technology Instant Hot Water on Demand, Smart Wi-Fi App Control

Main Highlights

Instant Hot Water: This upgraded smart natural gas tankless water heater delivers consistent performance with its 140,000 BTU burner and durable oxygen-free copper heat exchanger. With the latest intelligent heating technology, it provides hot water in just 1 second, giving you instant comfort without the wait.
Zero Cold Water Tech - Instant Hot WaterOur tankless water heater gas system features APUS exclusive single-circulation technology that eliminates cold water wait time. This on demand water heater delivers instant hot water while its 24/7 ECO smart cycle saves 40% more energy than conventional hot water heaters.
Built-in Booster Pump: Increases water flow by up to 130%, delivering a maximum of 6.8 GPM. Gas tankless water heater easily supports 2 showers and 2 sinks running at the same time without temperature fluctuations, ensuring a powerful and continuous hot water supply for the whole home.
Smart WiFi Remote Control: Control your tankless water heater gas anytime via mobile app (Works with Tuya APP). With one tap, busy professionals can preheat on the way home and step right into a comfortable hot shower after work. Adjust temperatures from 95°F140°F, monitor performance, and receive alerts.
Smart Season Comfort Mode: Automatically adjusts outlet temperature based on incoming water, delivering consistent hot water all year round. With ±1°F precise temperature control, youll never worry about sudden cold water shocksjust steady comfort every time you turn on the tap.
Advanced Safety Features: Bottom turbo fan design (30% quieter than standard tankless water heaters); 8 protection systems including freeze and overheat protection; ECO mode optimizes this gas tankless water heater model for maximum efficiency.Compact & Easy Installation: Our space-saving tankless water heater (21.3×13.6×7.1") installs easily with standard 1/2" NPT connections. This propane tankless water heater is ideal for whole-house use and comes with customer service 24/7 US support.
Built-in intelligent freeze protection automatically activates in low temperatures. Please note: When the ambient temperature approaches or falls below 41°F (5°C) for extended periods, or if the water heater will be unused for a long time, the unit must be completely drained of water to prevent internal components from freezing and cracking.

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Main Highlights

Instant Hot Water: This upgraded smart natural gas tankless water heater delivers consistent performance with its 140,000 BTU burner and durable oxygen-free copper heat exchanger. With the latest intelligent heating technology, it provides hot water in just 1 second, giving you instant comfort without the wait.
Zero Cold Water Tech - Instant Hot WaterOur tankless water heater gas system features APUS exclusive single-circulation technology that eliminates cold water wait time. This on demand water heater delivers instant hot water while its 24/7 ECO smart cycle saves 40% more energy than conventional hot water heaters.
Built-in Booster Pump: Increases water flow by up to 130%, delivering a maximum of 6.8 GPM. Gas tankless water heater easily supports 2 showers and 2 sinks running at the same time without temperature fluctuations, ensuring a powerful and continuous hot water supply for the whole home.
Smart WiFi Remote Control: Control your tankless water heater gas anytime via mobile app (Works with Tuya APP). With one tap, busy professionals can preheat on the way home and step right into a comfortable hot shower after work. Adjust temperatures from 95°F140°F, monitor performance, and receive alerts.
Smart Season Comfort Mode: Automatically adjusts outlet temperature based on incoming water, delivering consistent hot water all year round. With ±1°F precise temperature control, youll never worry about sudden cold water shocksjust steady comfort every time you turn on the tap.
Advanced Safety Features: Bottom turbo fan design (30% quieter than standard tankless water heaters); 8 protection systems including freeze and overheat protection; ECO mode optimizes this gas tankless water heater model for maximum efficiency.Compact & Easy Installation: Our space-saving tankless water heater (21.3×13.6×7.1") installs easily with standard 1/2" NPT connections. This propane tankless water heater is ideal for whole-house use and comes with customer service 24/7 US support.
Built-in intelligent freeze protection automatically activates in low temperatures. Please note: When the ambient temperature approaches or falls below 41°F (5°C) for extended periods, or if the water heater will be unused for a long time, the unit must be completely drained of water to prevent internal components from freezing and cracking.

8.3

Very Good

APUS

APUS 190,000 BTU Outdoor Tankless Water Heater, 8.1 GPM Natural Gas Instant Hot Water Heater with WiFi & Remote Control, High Efficiency for Supports 5 Outlets

Main Highlights

Whole-Home Hot Water: This high-efficiency gas tankless water heater delivers 190,000 BTU and 8.1 gallons per minute of instant hot water, making it the perfect on demand water heater for whole-house use. Our advanced tankless water heater gas system effortlessly supplies 3 showers + 2 faucets simultaneously, while the ultra-low 0.79 GPM minimum flow ensures this hot water heater performs reliably even with weak water pressure
Smart Temperature Control: Remotely adjust your tankless hot water heater via App (Works with Tuya APP) or wired controller (95°F149°F). Enjoy precise on-demand heating with a stable ±1°F temperature accuracy
Compact Outdoor-Friendly Design: With a space-saving size of 22.48 × 15.51 × 6.54 inches, this unit is easy to install outdoors while keeping your indoor space uncluttered. It connects directly to a 120V AC power source for straightforward setup, and features standard 3/4" water and gas connections for smooth integration with most home systems
Advanced Heat Exchanger: The heart of our tankless water heater gas system features 100% oxygen-free copper (30% more efficient than conventional water heaters) combined with intelligent staged combustion technology. This gas tankless water heater delivers 20% energy savings while outperforming standard gas water heaters in durability and performance
All-Weather Performance: Engineered for harsh conditions, this rugged outdoor tankless water heater gas unit features wind-resistant construction (10-level wind rating) with electric anti-freeze protection. As a true all-climate hot water heater, it maintains flawless operation even in extreme weather conditions - the ultimate on demand water heater solution for outdoor installations
Complete Safety Protection: Your investment in this premium tankless water heater is protected by comprehensive freeze/overheat/flame failure safeguards. This tankless water heater gas comes with a 2-year full warranty on all hot water heater components, ensuring years of trouble-free operation

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Main Highlights

Whole-Home Hot Water: This high-efficiency gas tankless water heater delivers 190,000 BTU and 8.1 gallons per minute of instant hot water, making it the perfect on demand water heater for whole-house use. Our advanced tankless water heater gas system effortlessly supplies 3 showers + 2 faucets simultaneously, while the ultra-low 0.79 GPM minimum flow ensures this hot water heater performs reliably even with weak water pressure
Smart Temperature Control: Remotely adjust your tankless hot water heater via App (Works with Tuya APP) or wired controller (95°F149°F). Enjoy precise on-demand heating with a stable ±1°F temperature accuracy
Compact Outdoor-Friendly Design: With a space-saving size of 22.48 × 15.51 × 6.54 inches, this unit is easy to install outdoors while keeping your indoor space uncluttered. It connects directly to a 120V AC power source for straightforward setup, and features standard 3/4" water and gas connections for smooth integration with most home systems
Advanced Heat Exchanger: The heart of our tankless water heater gas system features 100% oxygen-free copper (30% more efficient than conventional water heaters) combined with intelligent staged combustion technology. This gas tankless water heater delivers 20% energy savings while outperforming standard gas water heaters in durability and performance
All-Weather Performance: Engineered for harsh conditions, this rugged outdoor tankless water heater gas unit features wind-resistant construction (10-level wind rating) with electric anti-freeze protection. As a true all-climate hot water heater, it maintains flawless operation even in extreme weather conditions - the ultimate on demand water heater solution for outdoor installations
Complete Safety Protection: Your investment in this premium tankless water heater is protected by comprehensive freeze/overheat/flame failure safeguards. This tankless water heater gas comes with a 2-year full warranty on all hot water heater components, ensuring years of trouble-free operation

8.1

Very Good

Ranein

Ranein Natural Gas Tankless Water Heater, Indoor Max 8.5 GPM, 190,000 BTU Instant Hot Water Heater

Main Highlights

Fans Placed Underneath: It will be more secure in terms of safety, and no smoke backflow will occur. The blower has large power and can automatically adjust the rotating speed according to the change of external wind pressure and the change of water temperature to provide sufficient oxygen for gas combustion, ensuring full combustion and safer use. Low noise and longer service life.
No Waiting Required: Unlike traditional tank water heaters, tankless water heaters eliminate the need for a 30-minute preheating wait time, allowing you to have unlimited hot water on demand.
Easy to Assemble and Use: Uses standard 3/4" NPT water inlet fittings and air inlets for quick installation. Its compact size of 24.25"L x 15.08" W x 8.07"H takes up almost no space. If you have any questions about installation and operation, please do not hesitate to contact us and we will serve you wholeheartedly.
Wide Application: 190,000 BTU high heating capacity and maximum 8.5 GPM. It is suitable for 4-6 outlet points, which can satisfy whole family.
Note: We provide a 2-year warranty for the water heater. If you encounter any issues, please contact us. In cold weather, if the water heater is not used for a long time, the pressure relief valve needs to be opened to drain the remaining water in the water heater. Not recommended for areas over 2,000 feet.

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Main Highlights

Fans Placed Underneath: It will be more secure in terms of safety, and no smoke backflow will occur. The blower has large power and can automatically adjust the rotating speed according to the change of external wind pressure and the change of water temperature to provide sufficient oxygen for gas combustion, ensuring full combustion and safer use. Low noise and longer service life.
No Waiting Required: Unlike traditional tank water heaters, tankless water heaters eliminate the need for a 30-minute preheating wait time, allowing you to have unlimited hot water on demand.
Easy to Assemble and Use: Uses standard 3/4" NPT water inlet fittings and air inlets for quick installation. Its compact size of 24.25"L x 15.08" W x 8.07"H takes up almost no space. If you have any questions about installation and operation, please do not hesitate to contact us and we will serve you wholeheartedly.
Wide Application: 190,000 BTU high heating capacity and maximum 8.5 GPM. It is suitable for 4-6 outlet points, which can satisfy whole family.
Note: We provide a 2-year warranty for the water heater. If you encounter any issues, please contact us. In cold weather, if the water heater is not used for a long time, the pressure relief valve needs to be opened to drain the remaining water in the water heater. Not recommended for areas over 2,000 feet.

8.1

Very Good

Rheem

Rheem RTG-84XLN-3 High Efficiency Non-Condensing Outdoor Tankless Natural Gas Water Heater 8.4 GPM, 180,000 BTUs

Main Highlights

High-efficiency tankless gas water heater delivers up to 8.4 GPM, perfect for 23 bathroom homes with multiple hot water needs like showers and laundry.
Powered by natural gas with 180,000 BTUs, this durable tankless unit ensures fast, reliable hot watereven during peak household demand.
Designed for outdoor installation, this high-efficiency tankless natural gas water heater features a durable metal cabinet and supports easy wall mounting by a qualified installer.
Hot-start programming prevents cold water bursts, making this tankless natural gas water heater ideal for back-to-back showers.
Rheem RTG tankless gas water heaters offer high-efficiency, space-saving designs with multiple models to fit any home size, fuel type, and hot water demand.

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Main Highlights

High-efficiency tankless gas water heater delivers up to 8.4 GPM, perfect for 23 bathroom homes with multiple hot water needs like showers and laundry.
Powered by natural gas with 180,000 BTUs, this durable tankless unit ensures fast, reliable hot watereven during peak household demand.
Designed for outdoor installation, this high-efficiency tankless natural gas water heater features a durable metal cabinet and supports easy wall mounting by a qualified installer.
Hot-start programming prevents cold water bursts, making this tankless natural gas water heater ideal for back-to-back showers.
Rheem RTG tankless gas water heaters offer high-efficiency, space-saving designs with multiple models to fit any home size, fuel type, and hot water demand.

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