Do I need a water tank

Do you need a water tank in the loft with a combi boiler?

Asked by Luke on 19th Aug 2025
Expert Trade Answers
"No whoever fitted the combi should have linked the cold down service to the mains water"
Answered on 26th Aug 2025 - Member since Aug 2025 - report
"No you do not need a water tank in your loft for a combination boiler"
Answered on 19th Aug 2025 - Member since Jun 2024 - report
"Hi Luke, no you wouldn't require tanks in the loft with a combi boiler."
Answered on 19th Aug 2025 - Member since Aug 2025 - report
"No you don’t need any water storage tanks if you have a combi boiler installed"
Answered on 19th Aug 2025 - Member since Aug 2023 - report
"No you don’t need a water tank any longer with a combi boiler as it is fed directly from you’re mains water supply."
Answered on 19th Aug 2025 - Member since Jun 2025 - report
"Hi, no header tank required in the loft for your heating or hot water, with a combination boiler the boiler is mains water fead and the heating side is a completely sealed system. Hopes this helps. Thanks Steve."
Answered on 19th Aug 2025 - Member since Jul 2025 - report
"No you won’t, it comes straight off of the mains, so a water tank is no longer needed"
Answered on 19th Aug 2025 - Member since Sep 2024 - report
"No you don't need a water tank with a combi boiler it's instant hot water"
Answered on 19th Aug 2025 - Member since Nov 2024 - report
"Hi Luke. No water storage tanks are required in your property for a combi boiler to function. It runs directly from your mains water supply."
Answered on 19th Aug 2025 - Member since Oct 2024 - report
"No you dont require a water tank in the loft with a combi boiler"
Answered on 19th Aug 2025 - Member since Oct 2024 - report
"No, if the combi has a pressure vessel it will heat the system instantaneously. but you can find that if someone runs a tap elsewhere it can fluctuate depending on the boiler. If the boiler does not contain a pressure vessel you will need to install one on the system for the heating side."
Answered on 19th Aug 2025 - Member since Jul 2025 - report
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