The water heater’s power is measured in kilowatts (kW), which usually refers to the power of the electric heating tube in the water heater. The greater the power, the more heat is generated. This means less heating time is required and there is a higher load on the wire.

The power of common water heaters on the market are 6.5kW, 9kW, 14kW, 18kW, etc.

When purchasing an electric tankless water heater, you can choose your preferred power level for what you need, the number of faucets, and the water consumption habits.

Normally, the climate in the south is warmer and the requirements for the heat load ( power) of the water heater are lower. From an economic point of view, 14kW water heaters can meet the requirements of comfortable bathing. Meanwhile, in the north, the water temperature is lower, especially in winter when the heat load ( power) of the water heater is required to be large enough to meet the requirements of comfortable bathing, so families in the north should choose an 18kW water heater.

If you have multiple showers, choose a high-power capacity water heater or try to install multiple water heaters.

Click here to learn how to choose the right electric tankless water heater.