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  • FIRST POST
    • georgez
    • By georgez 8th Feb 18, 6:38 AM
    • 1Posts
    • 0Thanks
    georgez
    Boiler pressure
    • #1
    • 8th Feb 18, 6:38 AM
    Boiler pressure 8th Feb 18 at 6:38 AM
    Hi, really confused. When switched off, my boiler pressure is zero. But, when i switch the heating on, the pressure rises and everything seems to work as normal ie radiators ok and hot water ok. Should I still be concerned, don't want to cause any damage to boiler. Thank you
Page 1
    • TeamPlum
    • By TeamPlum 8th Feb 18, 6:58 AM
    • 182 Posts
    • 431 Thanks
    TeamPlum
    • #2
    • 8th Feb 18, 6:58 AM
    • #2
    • 8th Feb 18, 6:58 AM
    When you say switched off, do you mean 'without power' or do you mean 'the central heating isn't on'?

    I wouldnt be concerned as boilers will disable themselves when pressure is too low
    • MikeEngTech
    • By MikeEngTech 8th Feb 18, 8:15 AM
    • 42 Posts
    • 8 Thanks
    MikeEngTech
    • #3
    • 8th Feb 18, 8:15 AM
    • #3
    • 8th Feb 18, 8:15 AM
    Not all boilers have a low or high pressure cut off. If it!!!8217;s below 0.8 bar when cold then top it up. If it climbs above 2.5 then you need to call someone out.
    Your boiler will have user instructions that will tell you want the pressure should be.
    • malky39
    • By malky39 8th Feb 18, 9:42 PM
    • 652 Posts
    • 162 Thanks
    malky39
    • #4
    • 8th Feb 18, 9:42 PM
    • #4
    • 8th Feb 18, 9:42 PM
    Most boilers will sit at about 1-1.5 bar when cold/heating is off. When the heating is on this will rise maybe by 0.0-1 bar. But should never go over 3 bar, or as mentioned you have other issues going on. When the boiler is cold top up the pressure to about 1-1.5 bar. Then leave it to run. You may want to bleed the rads at the same time as doing this.
    The hot water is not affected by the pressure.
    • boliston
    • By boliston 8th Feb 18, 9:45 PM
    • 2,538 Posts
    • 2,110 Thanks
    boliston
    • #5
    • 8th Feb 18, 9:45 PM
    • #5
    • 8th Feb 18, 9:45 PM
    Most boilers will sit at about 1-1.5 bar when cold/heating is off. When the heating is on this will rise maybe by 0.0-1 bar. But should never go over 3 bar, or as mentioned you have other issues going on. When the boiler is cold top up the pressure to about 1-1.5 bar. Then leave it to run. You may want to bleed the rads at the same time as doing this.
    The hot water is not affected by the pressure.
    Originally posted by malky39
    Surely the system pressure needs a basic level of pressure eg 0.5 bar for the heat exchanger to work?
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