Cylinders

A hot water cylinder is usually made from stainless steel with insulation surrounding it and an outer casing. Inside the cylinder, there will be one or more coils which transfer the heat generated by the heat source into the water contents of the cylinder. Cylinders are designed to store the hot water which then feeds to the taps in your home. Unless you have a combination boiler, it is likely that you will have a separate cylinder for your domestic hot water. All air source heat pumps, solar thermal systems and hybrid installations require a separate cylinder.

Cylinders typically come in sizes from 150litres up to 300litres. The size of hot water cylinder that you require will depend on the number of occupants in your home and your demand for hot water. For example, a family of four will have a larger hot water demand compared to a single occupancy home because they will use the taps, showers or bath more often. If you are researching a new heating system for your home, please speak to your installer who will be able to advise you about the most suitable size of cylinder you will need.

Yes, you need to have your Grant hot water cylinder serviced on an annual basis and the Benchmark book (supplied with your cylinder) should be filled out as evidence that the service has been completed. Your cylinder should be serviced by a competent person in accordance with the installation and servicing instructions. If your original installing engineer is unable to service your cylinder, you can either find an alternative service engineer via our online search or you can contact the Grant UK ServicePlan Team.