The cylinder (or hot water tank) is the part of your heating system that stores hot water. It’s typically found in the loft or an airing cupboard.

Select ‘Yes’ if you have one and wish to keep it.
Choose ‘Yes – Remove it’ if you’d like to replace it with a combi boiler.
Select ‘No’ if you already have a combi boiler or do not have a hot water cylinder.
If you’re unsure, select ‘Not Sure’.