Install or replace hot water cylinder

Install or replace hot water cylinder

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If I want to install or replace a hot water cylinder, will the building regulations apply?

YES - If you are installing or replacing a hot water cylinder within an unvented hot water storage system, i.e. a system supplied directly from the water mains with no open-ended pipe for venting and with a storage capacity greater than 15 litres.  The requirements are for hot water to be safely stored under pressure and for the installation to be energy efficient. The cylinder should be installed by a person competent to do so. 

YES - If you are installing or replacing a hot water cylinder within a vented hot water storage system, i.e. a system fed from an open-ended pipe for venting.   

For either type of system your installer should leave you with a completed installation record and commissioning certificate such as the one produced by the BENCHMARK scheme. Some manufacturers attach BENCHMARK certificates to cylinders ready for installers to complete.

If you use an installer registered as a competent person, this would result in not needing to apply to building control. Click here for further information.