【Note】Make sure this water heater is sized for your hot water needs: 18 kW; 240 volts, circuit breaker required 2 x bipolar 40 amps; unit dimensions 13.8" x 3.1" x 18.7"; water connection 3/4" NPT. 2-year limited warranty. Suitable 2-3 point of use throughout the whole house. 【Energy and Space Saving】You can adjust the desired temperature, when the water heater reaches the set temperature, it will automatically adjust the heat needed to heat the water, making the water maintain a certain temperature, with an efficiency of up to 99.8%, which saves up to 60% of the cost of water heating compared to traditional tank-type water heaters. Wall-mounted installation, compact size, no tank, easy to use in any space, saving floor space, suitable for small spaces. 【Convenient Use】The tankless water heater comes with a knob controller so temp setting is an easy job. Now turn on the tap and let the smart unit do the rest, you needn’t go through a hard lesson about temp setting by a mixer tap without any hint. 【Durable】The heating element is separated from the water pipe, greatly reducing scale, corrosion, and mineral buildup on the element, achieving better performance and lower maintenance costs.IPX4 waterproof and over-temperature protection. The control panel is made of iron, more durable and easier to operate. 【Instant Unlimited Hot Water】 It utilizes an 18 kW heating system that delivers higher levels of instant, stable, constant hot water in a short period of time without having to wait to warm up or worry about temperature fluctuations. Automatically adjusts energy consumption based on revenue water temperature and flow rate to ensure maximum efficiency, consistently stable temperatures, and optimal power usage. The digital temperature display adjusts in 1° increments from 68°F to 122°F.