What is a Combination Boiler?
A combination, or combi, boiler offers high efficiency space heating and domestic hot water (DHW) while boasting a small footprint. These units install easily and require little maintenance. The water heating process begins with a hot water tap being opened, which causes water to flow through the heat exchanger. Heated boiler water from the fire tube heat exchanger transfers heat to the domestic water to raise it to the desired temperature. A diverter valve moves the heated boiler water to an external space heating loop when space heating is needed.