State Tankless Water Heaters
Review and Buying Tips

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 for home use, and it covers the main features and what benefits the customers are going to get.

All the on-demand water heaters from State manufacturer are wall-hanging, small in size and with the nice attractive design, which allows installation 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 options. Indoor models (NI) are installed only inside the building, while the outdoor (NE) are designed ventless, for the outside installation, on the exterior wall or in the protective 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.

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Air-fuel ratio sensor

State tankless water heaters are equipped with the air-fuel ratio sensor that adjusts the fan motor speed and therefore allows proper air/fuel mixture for the ideal gas combustion. This is what boosts the performances, 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 the element exposure to high temperatures, overheat cut off and internal freeze protection system that turns on if the temperature of surrounding air drops and there is a 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 of the 510, 510U and 540H series and Multi-unit system that allows connection of up to 20 units of the 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. The highest turndown ratio is found on 510 series; the minimum power is 11,000 BTU while the maximum is 199,900 BTU.

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Types and models review

State non-condensing tankless water heaters

State non-condensing tankless water heaterNon-condensing type

All non-condensing tankless water heaters from State manufacturer have the energy factor of 0.82, which makes them high efficient with the reduced gas emission (ā€œUā€ series are Ultra Low NOx models).

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

Every unit from the 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 consists 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 suitable for homes with 2-4 bathrooms.

All three groups of tankless water heaters have a compact size and small weight ranging from 33 to 39 pounds.

State condensing tankless water heaters

State condensing tankless water heaterCondensing type

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Condensing water heaters are also Energy Star but provide more savings due to the ultra-high energy factor ranging from 0.93 to 0.95 (240, 340 and 540 series).

Condensing models have two heat exchangers where the secondary element is made of heavy-duty stainless steel, 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.

The maximum gas power is slightly lower than the power found on 540 series, it is 199,000 BTU while the hot water flow is the same, 10 GPM. Due to the presence of the secondary heat exchanger, the weight of a condensing tankless water heater is significantly higher, the maximum weight is 59 lbs.

As can be seen from the above, State tankless water heaters are about technology, efficiency, savings, and flexibility. The models can be used in a variety of applications mainly due to its flexibility in venting installation when used in recirculation systems, a combination with storage tanks, home heating system, solar heating, as one unit or combined in multiple systems. Due to an endless supply of hot water and great peak-time performance, State tankless are ideal for demanding families.

All State tankless water heaters, either non-condensing or condensing come with the 15-year warranty on the heat exchanger and in residential applications, and 10 years in commercial applications.

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