Minimum Hot Water Storage Capacity
60 °C
Domestic hot water storage systems must provide a minimum capacity to adequately supply hot water at a target temperature, typically 60°C
Domestic hot water storage systems must provide a minimum capacity to adequately supply hot water at a target temperature, typically 60°C. If appliances or specific usage patterns require greater volumes than the standard minimums, the storage capacity should be increased accordingly to meet these demands.
Basis in regulation
BS 8558
Read the source
How to check it on site
Verify the installed hot water cylinder volume matches the design requirements for the dwelling size and anticipated usage.
Common failure
Installation of an undersized hot water cylinder, leading to insufficient hot water for household needs.
Last updated 23 August 2026. This is our editorial summary of publicly available regulation, not building control approval or a warranty determination.