19 Top Rated of Best Gas Tankless Water Heater 2021 [Bestseller $ Buying Guide]

Endless Hot Water: Enjoy unlimited hot water flow throughout the house; compact, durable, and easy to install; professional installation recommended

Energy and Space Efficient: Space-saving design conserves energy as it heats only when necessary

Optimal Water Pressure: Up to 11 GPM hot water flow rate for a powerful, constant stream

Instant Heating: Equipped with Circ-Logic - Pair with an external pump to reduce wait time for hot water via scheduled or on-demand recirculation

Guaranteed to Last: 15-, 5-, and 1-year residential for heat exchanger, labor, and parts, respectively. Wifi monitoring.

Compact,Light Weight Portable Design-12.8 (L)*6.1(W)*21.65(H) inch ,Weight-23.85 lb. Compact and portable design perfect for barns,cabins,outdoor instant hot shower and road trips.

Easy Installation for Instant Hot Water-It only takes you a few minutes to get 2.64 gallons per minute of instant hot water. The camplux portable water heater lights when water pressure between 3.6-110 PSI, low water pressure is perfect for campings and remote cabins.

Multiple Protection Ensure Your Safety-Flame failure device, anti-freezing protection, over heating protection to ensure the family safety. The anti-freezing drain plug discharges the residual water to avoid freezing in cold areas for long-time maintenance. Gas supply automatically shut off when high water temperature protection over 167 °F.

Power Efficient & Energey Saving -Maximum power output 68,000btu/hour, you will get instant endless hot water easily wherever you are. Compact and lightweight structure with 11.5% energy saving technology. The propane water heater exchanger and main burner are desinged with advanced combustion technology to decrease gas consumption and burning noise.

Important Tips -To avoid gas leakage caused by improper sealing of the water heater, DO NOT TWINE TEFLON TAPE between gas regulator and gas inlet pipe. The tankless water heater will "caught on fire "with improper operation. Always check gas leakage before operation.

Original Design: Tankless hot water heater only heats when necessary to conserve energy; For the latest in non-condensing technology and a cleaner layout that speeds up service and installation, check out our new RE180iN model

Never Run Out of Hot Water with this Compact Tankless Gas Water Heater: Non-condensing tankless hot water heater from Rinnai is only the size of a small suitcase and fits in a wide variety of spaces, but provides up to 7.5 GPM (5 fixtures at once)

Smart, Durable Design: Enhanced scale detection helps prevent serious, long-term damage to unit; Includes 15-, 5-, and 1-year residential guarantee for heat exchanger, labor, and parts, respectively; See Controlr module for WiFi control (not included)

Professional Installation Recommended: Visit the Find a Rinnai PRO page on our website to locate a qualified technician in your area to install your tankless water heater; 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 for your home; Check our Ground Water Temperature Map to see if this heater is optimal for your region

Stable Hot Water Flow - There is Stable Hot Water Flow When You Take Shower for Tankless Water Heater Propane, Enjoy Happy Shower Time.

CSA Certified Gas Connector, No Leaking Gas - This Propane Water Heater Tankless with CSA Certified Gas Quick Connector, Approved in USA and Canada. Installation is safety, Quickly and Convenient, No Leaking Gas, No Fire.

Sturdy and Durable - Stainless Steel Shower Head, Hot and Cold Hose; 0.2mm(0.07inch) Panel, 100% Copper Valve, to Keep Propane Water Heater Tankless in Long-life and Quality.

More Better Heating - Heat Exchanger of the Portable Water Heater is 100% Pure Copper with Tinned Finish, to Keep Heat Energy Inside, Heating Faster and Better, Save Time.

More Protections, More Safety- Tankless Propane Water Heater with Over-heating(75℃/167 °F) and Anti-frozen and 20 mins Automatic Shutoff Protection, LED indicator, 100% Inspection before ship out, 1 years Warranty.

CSA Certified

LED Touch Screen Computerized Safety

Flow activation

Oxygen free copper heat exchanger

Stainless Steel Venting Exhaust

Anti-Freeze Protection

UL listed

DOE

Original Design: Tankless hot water heater's Circ-Logic technology offers recirculation patterns that match your habits; For the latest in non-condensing technology that speeds up service and installation, check out our new RE180eN model

Never Run Out of Hot Water with this Compact Tankless Gas Water Heater: Non-condensing tankless hot water heater from Rinnai is only the size of a small suitcase and fits in a wide variety of spaces, but provides up to 9.8 GPM (6 fixtures at once)

Smart, Durable Design: Includes 12-, 5-, and 1-year residential guarantee and 5-, 5-, and 1-year commercial factory warranty for heat exchanger, labor, and parts, respectively; See Controlr module for WiFi control (not included)

Professional Installation Recommended: Visit the Find a Rinnai PRO page on our website to locate a qualified technician in your area to install your tankless water heater; 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 for your home; Check our Ground Water Temperature Map to see if this heater is optimal for your region

No more waiting for the water tank to warm up or running out of warm water halfway through your shower. With this amazing machine, you can have a steady stream of hot water flowing to your faucets or shower without waiting for the tank to warm up.

There is a forced exhaust structure that keeps the air safe and clean while and after entering the combustion chamber. There is also a dust net to make sure no dirt gets into the tankless water heater.

There is a low water pressure startup, which helps to protect the heater and make it easier to use.

Exclusive Water Savings technology conserving up to 1, 100 gallons per year

157, 000 BTU (gas consumed per hour)

Exclusive Hot Start Programming minimizes cold water burst by staying in ready-fire state

Recirculation pump ready kit ready

For use outdoors with freeze protection up to -30 degrees

Fuel Type: Natural Gas

Hot water without the wait - or the waste

Low operating cost - High energy efficiency and water savings setting

Space Savings - Compact, space-saving design. Perfect for a tank replacement.

Water & Gas Leak Detection will shut down unit and provide an error code

For use indoor only

3.18 GPM Instant Constant Water Heater -Camplux 3.18 GPM tankless water heater natural gas delivers 3.18 gallons per minute of on-demand endless hot water ensures constant comfortable instant hot water for 2-3 persons whole house. 3.18-GPM heater is activated by water flow rather than water pressure; Minimum activation water capacity rate: 0.65 GPM-4.8 GPM; Maximum input rating: 82,000 BTUs; Water connection location/size: Bottom/0.5-inch NPT.

Convenient, Easy Installation -The tankless water heater uses standard 1/2" BSP water fitting and gas inlet. The water heater comes with1/2 " BSP female to 1/2" NPT male gas connector adapter then you want hook this water heater to natural gas pipe directly.It also comes with 2.3" horizontal vent pipe,ensures efficient power ventilation. You can take Camplux customized wall thimble-WT236 for perfect indoor use.

Modern Design,Easy Operation -Trendy and modern design with unique white glassy front panel，easy to control the water temperature with LED touchscreen (Fahrenheit and Celsius switch optional).The compact size on demand water heater saves more space than traditional tanks.

Outstanding Features- The Camplux tankless gas water heater comes with oxgen-free copper heat exchanger and v-type stainless steel burner,high heating efficiency up to 89.98 %; 90°wind isolation design, this tankless natural gas water heater can anti backflow wind in high floors, the S/S 2.36 ” vent pipe exhaust harmful gases quickly.

6-In-1 Protection Ensure Your Safety- Dry combustion,flame failure device, anti-freezing protection, over heating protection to ensure your safety. Fully automatic temperature controls with an energy saving mode and child lock technology.

Note- The standby electric power of is 2W, working electric power is 42W. Natural gas input pressure is 0.25 psi. There is a pressure relief valve at the water inlet of water heater. It is necessary to manually unscrew the pressure relief valve to drain the water inside the machine in time after using the machine to avoid freezing and blew up when the temperature is lower than 32 ° F in winter.