The ThermoMate is a natural gas tankless water heater rated at 75,000 BTU and up to 2.9 GPM, sized for one or two fixtures at a time rather than a whole house. Its oxygen-free copper heat exchanger transfers heat well and resists corrosion, and the flow-sensor control holds output within about ±1°F. It carries a long list of safety cutoffs: boil-dry, overheat, leak, freeze, flame-failure and high-pressure protection. Against larger gas tankless units it gives up flow capacity, so it suits a cabin, apartment, addition or point-of-use install more than a busy family home. Owners rate it highly, though only a small number have reviewed it.
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Owners who rated it give it high marks, and the recurring points are steady hot water and the safety features.
This is a 75,000 BTU natural gas tankless water heater for indoor residential use. It heats water on demand, so there is no warm-up time. It delivers up to 2.9 gallons per minute, enough to serve 1-2 fixtures at the same time, such as a shower, a sink, or laundry.
The heat exchanger is made of oxygen-free copper, which offers heat transfer and corrosion resistance compared to stainless steel models. A water flow sensor and a built-in chip adjust heating power 20,000 times per second. This keeps water temperature within ±1℉.
The heater measures 21" high x 13" wide x 7" deep. Its compact size fits in small utility rooms or closets. Safety protections include boil-dry, overheat, water leak, anti-freeze, flame failure, and high water pressure protection.
