
18kW Touch Control Electric Tankless Water Heater – 240V, Self-Modulating
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The ThermoMate 18kW is an electric tankless water heater that heats water only as it flows, so there is no tank to refill and no standby heat loss. It delivers up to 4.4 GPM at 240V and uses self-modulating control to match power draw to demand, with touch controls on the unit. It suits indoor point-of-use and whole-home setups where the electrical panel can carry the load: it needs at least 150 amps of total service, two dedicated 40-amp double-pole breakers and two runs of 8 AWG copper wire. Against gas tankless models it avoids venting and gas lines, but its output is capped by the 18kW element and by how cold the incoming water is, so in cold climates it covers fewer fixtures at once than larger electric units.
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This 18kW electric tankless water heater heats water only when it is needed, so there is no storage tank to refill. It delivers up to 4.4 GPM for showers, bathroom sinks, kitchen sinks and other indoor residential uses. How many fixtures it can support depends on the incoming water temperature, the desired outlet temperature and each fixture's flow rate.
A self-modulating system monitors water flow and inlet temperature in real time and adjusts power output to keep the water temperature stable. The touch control panel sets the outlet temperature from 80°F to 140°F. Thermal efficiency is up to 99%.
The heating block is cast aluminum with iron-chromium-aluminum alloy heating elements and a water-and-electricity separation structure. The unit mounts on the wall and measures 13.15 inches wide, 17.09 inches high and 3.15 inches deep. It is ETL listed and designed to meet UL 499 and CAN/CSA C22.2 safety standards. Each unit is factory tested.








