State Tankless Water Heaters Review

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State tankless water heaters are gas-powered appliances that are designed to heat potable water, on demand, in endless and continuous supply in residential and light commercial applications. This review is about State tankless and it covers the main features and benefits.

All the water heaters from State are wall-hanging, small in size and with the nice attractive design, so they can be installed anywhere inside the house, for point-of-use and whole-house water heating. The advanced built-in features allow high efficient, long lasting and reliable service during the time of its 15-year warranty, even longer.

There are two types of tankless appliances from State; condensing and non-condensing, both with an indoor and outdoor installation. Indoor models are installed only inside the building, while outdoor are designed ventless, for the outside installation, on the exterior wall or in the recess box.

The indoor models use the vent pipe to get the fresh combustion air in and move the exhaust gases out. Some of the indoor models can be converted to use direct venting. The use of PVC, ABS and other cheap materials make condensing venting cheaper than venting found on non-condensing.


Air-fuel ration sensor

State tankless water heaters are equipped with the air-fuel ratio sensor that adjusts the proper fan motor speed and therefore allow proper air/fuel mixture for ideal gas combustion. This is what maximizes the efficiency and reduces the emission of greenhouse gases.

Safety features

The tankless units are very safe. If only one of the requirements is not met or one element doesn't work, the water heater will turn off. Safety features include the high limit switch to prevent exposure to high temperatures, overheat cut off and internal freeze protection system that turns on if the temperature of surrounding air drops and increase the risk of freezing.

Increased water flow option

The water flow can be increased by grouping two or more water heaters into one system. This is available through the Easy-Link system that allows connection of up to 4 units for 510, 510U and 540H series and Multi-unit system that allows connection of up to 20 units for 510U and 540H series, in residential applications.


Modulating gas control valve adjusts the gas flow rate so the water heater can use only the amount of energy that is required to meet the set temperature, so the energy loss is minimal.

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Types and Models

Non-condensing series

State non condensing tankless water heaters

All non-condensing tankless water heaters from State have the energy factor of 0.82, which makes them Energy Star compliant and high efficient with reduced gas emission (“U” series are Ultra Low NOx models).

Non-condensing models from 510 series have one heat exchanger only that is made tough to withstand high thermal stress and last long. It is made of strong HRS35 copper alloy that is durable and stronger than HE found in water heaters of other manufacturers.

Every unit from non-condensing group has the remote controller included and built-in temperature controller to monitor and adjust the temperature and for troubleshooting.

110 series

State tankless water heaters from 110 series include GTS-110 and GTS-110U models, which have the smallest size and capacity. With the maximum water flow rate of 6.6 GPM, tankless heaters can provide enough hot water for one to two showers, or smaller homes, apartments, condos, cottages and offices.

310 series

310 series includes GTS-310 and GTS-310U models, which, with the water flow of 8.0 GPM, are able to supply up to three-bath homes.

510 series

510 series consist of the GTS-510 and GTS-510U models, or standard and low NOx models that have the maximum water flow rate of 10 GPM making it good for homes with 2-4 bathrooms.

Condensing series

State condensing tankless water heaters

Condensing water heaters are also Energy Star but provide more savings due to the ultra-high energy factor of 0.91.

Condensing models have two heat exchangers where the secondary element is made of heavy-duty stainless steel that is resistant to corrosion and acidic condensation of the flue gases. There are several condensing models available: standard 320 and 520 and ultra-low NOx models; 240H, 340H and 540H.

As it can been seen from the above, State tankless water heaters are about technology, efficiency, savings and flexibility. The models can be used in variety of applications mainly due to its flexibility in venting installation, when used in recirculation systems, combination with storage tanks, home heating system, solar heating, as one unit or combined in multiple system.

(Pictures courtesy of State)