Split design allows you to install the outdoor unit outside, which is much quieter. The installation can be more flexible.
The enamel is brushed inside the water tank which is of high resistance and of great pressure bearing, because the enamel makes the welding line of the stainless panel separate with the water. That prolongs the working life for the unit.
The maximum outlet water temperature of the units can be up to 60 °C, which means the units are able to meet water requirement in a large amount.