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Thread: Central Heating but no hot water

  1. #21
    Automated Home Jr Member
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    Default Re: Central Heating but no hot water

    Nope, no joy at all - had everyone and his dog look at it now, everyone is completley stuck............it should be working!!! Got a friend coming around this week though, to quote me for a new boiler, condensing? seen as we spent 200 putting in a new hot water cylinder. Probably going to be expensive i would think, but at least we should be able to get hot water without the immersion!!

  2. #22
    Moderator sunbeam's Avatar
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    Default Re: Central Heating but no hot water

    did you try the boil tank?

  3. #23
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    Default Re: Central Heating but no hot water

    Sunbeam, I am a little afraid to do it to be honest! I have shown your posting to my friend and he is going to do it for me as a last resort. If i do it, i would probably break the boiler as i am a bit of a clutz!! I will let you know how I get on when he does it.

  4. #24
    Automated Home Jr Member
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    Default Re: Central Heating but no hot water

    Well after 2 months of the saga starting, I now have hot water through the boiler!!! and not through the immersion heater!!

    I have had a new (didnt have one there before) pump fitted to the pipes on the hot water tank in the airing cupboard.

    So in laymans terms (as I am one). The fire in the living room, heats the water, the boiler pumps the hot water up the wall (only it doesnt seem to), so the new pump sucks the water up the pipes into the hot water cylinder etc etc etc... it nearly didnt work as well all the pipes were getting very hot with the water but no hot water was still coming out. So i bled a small amount of air out of a venting tap i put in near the hot water cylinder and hey presto!! The return pipe started to get hot and i now have lovely hot water!! Two months of hard work and basically putting in a new system, piece by piece. So I guess with this pump in place I now have pumped system rather than a gravity fed??

    Thanks to everyone who replied with their suggestions!!

  5. #25
    Automated Home Jr Member
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    Default Re: Central Heating but no hot water

    Actually seens as you are all so helpful on here, heres another one for you. Now the radiators upstairs (only) get semi hot when I have the hot water on. Switch the central heatiing on they get very hot very quickly. Great. But why do the radiators get warm when i have hot water on?? I really dont have any diverter valves or anything, trust me (please read the full thread ) This doesnt really bother me so much now i have gas hot water but if it someting that can fixed quite easily I'll give it a go!! 8O

    Thanks again...

  6. #26
    Moderator sunbeam's Avatar
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    Default Re: Central Heating but no hot water

    when you have your boiler on hot water only, the water returning from the cylinder back to the boiler is finding it's way round the heating.

    the only sure way of stopping this is to trace the hot water return pipe and make sure it's the last tee into the boiler.

  7. #27
    Automated Home Legend TimH's Avatar
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    Default Re: Central Heating but no hot water

    I think this is a common feature of gravity hot water systems. The same thing happens in my parents house, where the bathroom radiators warm up when on the DHW is on.

    I guess, if you've only added a pump and no automated valves, that it's doing as Sunbeam suggests. You could change the pipework, or add a couple of valves, but maybe it's not worth the bother, at least until the spring anyway.

    Glad you've got it sorted finally :-)

    Cheers,

    Tim.

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