How does a system boiler work?

A system boiler, or sealed system, is a great option if you have more than one bathroom or your household has a high demand for hot water.

How does a system boiler work?

A system boiler contains all the major components of the heating system, including the pump and expansion vessel, which means installation is quick, neat and efficient. The boiler heats the water in a hot water storage cylinder, which in turn heats the water in the central heating system via a coiled heat exchanger and provides hot water to taps and showers.

Do I need a system or combi boiler?

If you have a high demand for hot water, for example, if you have more than one bathroom or shower room, a system boiler may be the perfect choice for you.

Will I need a separate expansion tank in the loft?

There is no need for a feed and expansion cistern in the loft if you have a pressurised unvented hot water storage cylinder. If you have an open vented hot water cylinder, you will need a cold water storage cistern in the loft.

Can system boilers supply several taps at once?

A system boiler is perfect for homes with multiple bathrooms; hot water is provided by a storage cylinder, so no matter how many taps you turn on, water will not run cold elsewhere in the house.