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Never run out of hot water again. This 27 kW tankless electric unit delivers up to 4.4 GPM—enough to run two showers and a sink simultaneously—without the bulk, standby loss, or temperature swings of a traditional 50-gallon tank. Advanced self-modulating technology adjusts power draw in real time so you only pay for the energy you actually use, cutting water-heating bills by up to 60 %. The 27kW tankless water heater electric delivers up to 4.4 GPM for 2–3 uses at once, such as showers, sinks, or laundry. No preheating, no waiting, and no temperature drops Adjust your preferred temperature between 86°F–140°F using the LED digital display with 1°F accuracy. The electric water heater built-in memory keeps your settings even after power outages. Self-modulating technology optimizes power usage based on flow rate, ensuring stable temperature and lower energy waste Achieving 99.8% thermal efficiency, this electric hot water heater on-demand water heater heats only when water flows—cutting up to 60% on energy bills. Zero standby heat loss and an anti-scale interior extend lifespan and maintain strong performance for eco-conscious households This tankless hot water heater ultra-slim wall-mounted heater (17.72" × 11.42" × 3.54") saves up to 90% more space compared to traditional tanks. With 3/4" NPT connections and 240 V compatibility（requires 3×40 A breakers,6×10 AWG cable), installation is easy and flexible—ideal for whole-house or point-of-use setups in bathrooms, kitchens, or laundry rooms Water heater type Tankless Water Heaters Fuel type Electric Brand LTMATE Features Easy Installation Rec location Bathroom, Kitchen Rec. room Bathroom, Kitchen, Laundry Room Dimensions 3.54 x 11.40 x 17.70 in Watts 27 kW Amps 40 Amps Volts 240 V Weight 18.9 lb Has nrtl listing certification N Model WM-WH-DSK270-G13-4(U001)