Reliance Tankless Water Heaters
Review and Buying Tips

Reliance tankless water heaters are high-efficiency and Energy Star gas-powered units that are designed for on-demand water heating in residential and light commercial applications. Check out the features to look for and popular models.

Reliance tankless water heater

The Reliance manufacturer offers several sizes for you to buy, divided into three groups; standard, heaters with the low NOx gas emission and condensing, with an option for indoor and outdoor installation and use of natural gas or propane. 

All the Reliance tankless models have an attractive and modern look; while its low weight construction and small size makes them perfect for installation on the wall and homes that lack in space. 

Reliance tankless technology is based on Takagi technology, heating water on demand, and delivering hot water in endless supply.

Models

Standard series

All the Reliance tankless water heaters that are using conventional on-demand technology utilize one commercial-grade heat exchanger for long-lasting water heating, while the advanced electronics makes the process more accurate, reliable, and convenient. The energy factor (EF) of the standard tankless-type heaters is approximately 0.82, which is much higher than the EF found on conventional tank-type models.

So, even if you buy a non-condensing model which is cheaper than condensing, you will reduce your energy bill. Water heaters come from the 110, 310 and 510 series, and include the 15-year warranty. Indoor models offer two vent types, two-pipe and concentric system. 

Models/Specs BTU
Min/ 
Max
Efficiency
EF
Flow Rate
Max (GPM)
# of 
baths
Remote /
Controller
TS-110-GI/E
Indoor\Outdoor
19,500
140,000
0.82 6.6 1-2 Yes
TS-310-GI/E
Indoor\Outdoor
11,000
190,000
0.82 8.0 2-3 Yes
TS-510-GI/E
Indoor\Outdoor
11,000
190,000
0.82 10.0 3+ Yes

Low NOx series

Reliance tankless water heaters that are found in the low NOx group utilize the advanced modulating eco-friendly gas burner, designed to heat water efficiently and at the same time produce less greenhouse gases. The proper gas combustion, which is represented by the light blue and stable flame, can be seen and checked visually through the burner window located in the middle of the unit. Ultra-low NOx models are ideal for regions with strict emission rules. Customers have an option to buy an indoor or outdoor heater from 110, 310, and 510 series.

Models/Specs BTU
Min/ 
Max
Efficiency
EF
Flow Rate
Max (GPM)
# of 
baths
Remote /
Controller
TS-110-UI/E
Indoor\Outdoor
15,000
140,000
0.82 6.6 1-2 Yes
TS-310-UI/E
Indoor\Outdoor
15,000
190,000
0.82 8.0 2-3 Yes
TS-510-UI/E
Indoor\Outdoor
15,000
190,000
0.82 10.0 3+ Yes

Condensing series

Condensing units from Reliance are coming from 140, 240, 340 and 540 series using either natural gas or propane and for installation either indoor or outdoor. These are the most advanced water heaters that utilize two heat exchangers and produce hot water with the ultra-high efficiency of 0.95 for some extra savings. Another feature that makes them different from non-condensing models is the use of low-cost venting/exhaust system due to the low temperature of the products of combustion. Non-condensing models are using stainless steel vents. 540 models are coming with the recirculation pump for faster hot water delivery.

Models/Specs BTU
Min/ 
Max
Efficiency
EF
Flow Rate
Max (GPM)
# of 
baths
Remote /
Controller
TS-240-GIH/GEH
Indoor\Outdoor
13,000
160,000
0.95 6.6 1-2 Yes
TS-340-GIH/GEH
Indoor\Outdoor
13,000
180,000
0.95 8.0 2-3 Yes
TS-540-GIH/GEH
Indoor\Outdoor
13,000
199,000
0.95 10.0 3+ Yes
320 Indoor
T-H2S-DV
13,000
180,000
0.95 8.0 2-3 Yes
320 Outdoor
T-H2S-OS
13,000
180,000
0.95 8.0 2-3 Yes
520 Indoor
T-H2-DV
13,000
199,000
0.95 9.0 3+ Yes
520 Outdoor
T-H2-OS
13,000
199,000
0.95 9.0 3+ Yes

Features

Water flow

Reliance tankless water heaters with the small and medium capacities are coming from the 110, 310, 140, 240 and 340 series and have the water flow rate from 6.6 to 8 GPM, which provides a continuous supply of hot water to homes with one to three bathrooms. Models from 510 and 540 series have a higher water flow of 10 GPM and are recommended for homes with up to four showers (warmer regions).

The 510 and 540 models also use the Easy Link system, the communication cable, which allows connection of up to four of the same models and therefore increase the power and water flow. If none of the Reliance tankless water heaters can meet the demand for hot water of your home, an Easy Link system is the right solution. Models from 540 series can also use the Multi-link option to connect up to 20 units.

Pump control

Condensing water heaters have an option to attach the recirculating pump to the pump control and work in four control modes. The benefits include faster hot water delivery, the higher recovery rate for storage tank applications, and greater energy savings.

Remote controller

All the units can use the temperature controller for easy temperature adjustment and diagnostics for faster troubleshooting. The temperature can be set in the range from 99 F to 167 F, or 185 F on some models, while the diagnostic feature provides an error code whenever there is a problem with the unit.

If the remote controller is not provided or connected to the heater, the temperature of the hot water can be adjusted by changing the dip switch setting on the computer board. There are four settings (from 113 F to 140 F) for 110 and 310 models and eight settings for the 510 model (from 104 F to 185 F).

Venting

A venting system is designed in a way, so the proper air supply is provided at all times without obstructions. Improperly used or damaged venting can lead to increased levels of carbon monoxide. By installing the direct vent kit, tankless water heaters will bring in all required combustible air from outside the home, while the termination is through the wall.

The air intake pipes can be made of various materials such as ABS, PVC, galvanized with a diameter of 3” while the exhaust system uses 4” Category III on non-condensing models. Pipes can run horizontally or vertically, and the maximum length is 50 ft. 

Some indoor models use a dual-pipe system while other concentric venting, which makes the installation easier.

The outdoor models, which are for the outside installation only, do not use the venting pipe system and are recommended for homes located in areas with the mild temperature climates.

Other features

  • Reliance tankless water heaters are appropriate for heating potable water and space heating.
  • Standard ¾” gas connection makes installation easy.
  • Electric ignition allows reliable start.
  • Freeze protection system guards the water heater from low temperatures, only if the electrical power is provided and inside elements.
  • Indoor and outdoor models available providing more options to the customers.
  • The self-diagnostic system is used for safety, fast, easy, and convenient troubleshooting. The error codes are shown on the remote controller, if installed, or if not the 7-seg LED (320, 510 and 520 models) and blinking red LED for the 110 and 310 models.
  • The computer board modulates gas and water valves so the unit can produce hot water with the correct temperature and reduced fluctuation.

Choose a tankless water heater wisely. You don’t want to buy something that won’t meet the comfort level you would expect. Reliance tankless water heaters from the 110 and 140 series are the smallest, designed for use in homes with up to 2 bathrooms (warmer regions), while models from 510 and 540 are the most powerful and advanced, with the highest water flow rating, delivering enough hot water to up to 4 fixtures at the same time, or more when linked.

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