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What bar should my boiler be?
Does the boiler pressure change at different times of the year? I'm not sure if the boiler pressure is getting low. What should it be at when running and then when off as well?
Expert Trade Answers
"Between 1 - 1.5 bar when boiler is cold. pressure will rise when a demand is put on the boiler."
Answered on 13th Apr 2026 - Member since Apr 2023 -
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"Between 1-1.5 when cold .
When running the pressure should fluctuate any more than 2 bar ideally"
When running the pressure should fluctuate any more than 2 bar ideally"
Answered on 13th Apr 2026 - Member since Apr 2026 -
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"Usually between 1 and 1.5 bar when cold. This pressure will rise with expansion when the system is hot."
Answered on 13th Apr 2026 - Member since Mar 2023 -
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"It should be between 1 to 2Bar ( green line) if it’s dropping or rising too fast then there must some issue.
Thanks"
Thanks"
Answered on 13th Apr 2026 - Member since Jan 2024 -
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"You should set your pressure at1bar and when boiler is running you will see pressure go up and drop but as long as it stays on 1 bar when not running you will be fine"
Answered on 13th Apr 2026 - Member since Feb 2026 -
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