What Is an Indirect Boiler System

An indirect water heater uses the main furnace or boiler to heat a fluid that’s circulated through a heat exchanger in the storage tank. … The energy stored by the water tank allows the furnace to turn off and on less often, which saves energy.

What is the difference between direct and indirect heating systems?

Direct heating – the water is heated directly from the heat source either by an immersion heater or by the boiler. Indirect heating – the central heating and the hot water are separate. The water is heated via a coil (heat exchanger) from a boiler. … It helps the system cope with the expansion of water in the system.

Is a combi boiler a direct or indirect system?

Direct design The pump on the boiler only runs when the heating is on. When a hot tap is running the pump stops running and the mains water running through the boiler on its way to the tap is heated up. Thats how a Direct Combi Boiler design works.