State GTS-310U Indoor/Outdoor NG/LP UltraLow NOx Tankless Water Heater
Get an endless supply of hot water from a compact, wall-mounted tankless water heater that will afford you substantial savings in energy costs.
Ships configured for Natural Gas, with Propane conversion kit included
The State GTS-310U is the most popular and versatile tankless heater from State Industries. It features a maximum flow rate of 8.0 GPM to provide enough hot water for three showers at the same time. It comes with a standard remote control. Complies with Ultra-Low NOx regulations (SCAQMD Rule 1146.2 and other air quality management districts with similar requirements for Ultra-Low NOx emissions requirements of 14 ng/J or 20 PPM). Meets ASHRAE 90.1b-1992 energy efficiency requirements.
Indoor models include an integrated temperature controller.
State Proline XE series tankless water heater features
Every tankless heater by State Industries has an internal freeze protection system, rated to protect the heaters in sub-freezing conditions. This prevents water temperatures in the heat exchanger from falling below a certain level, to prevent freeze damage.
This ensures that the water temperature does not exceed dangerous levels. It disengages the gas valves, which effectively shuts down the water heater.
Air-Fuel Ratio Sensor
State's unique sensor monitors and maintains optimal combustion at all times. The onboard computer adjusts the fan motor speed to make sure that air and fuel are mixed in the proper ratio to minimize emissions and maximize efficiency.
HRS35 Copper Alloy
The HRS35 copper alloy is heat-resistant, with additive elements which make it much stronger than the standard C1220 copper alloy commonly used in other heat exchangers. HRS35 is 8 times stronger than regular copper, even at high temperatures. It's also resistant to the damaging effects of erosion which is the leading cause of leaks in heat exchangers.
At every ignition cycle, thermal expansion causes heat exchangers to undergo heat stress. The thousands of ON/OFF cycles typical in commercial applications can be damaging to water heaters. This is why State Industry's commercial products utilize heat exchangers with drums that are 25% thicker to ensure durability. A thicker drum produces less strain for the heat exchanger.
316L Stainless Steel Secondary Heat Exchanger
The secondary heat exchanger, where the rest of the heat transfer happens, is made from high quality 316L stainless steel. Lower temperature causes acidic condensation, and stainless steel is needed to avoid corrosion. 316L stainless steel is more suitable in condensing heat exchangers because of the extreme environment (heat, chloride, acidic condensation) that the material is constantly subjected to.
Better Water Pathway Design
By redirecting and redesigning water flow, the heat exchanger drum and finned coil's temperature stay above dew point, making it more difficult for condensation to build up.
Widening the pitch at the heat exchanger fins not only improves durability by reducing blockage, but it also maintains higher temperature levels on the upper finned coils. Keeping an elevated temperature at these coils reduces the chances of condensation buildup.
Match the Unit to Your Needs
Flow Rate Guide (values are in gallons per minute, "GPM")
• Residential Use: 15 yrs limited heat exchanger, 5 yrs limited parts