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    Location of central heating timeswitch

    Why not update to a RF programmable room thermostat? you can put it pretty much anywhere you want then. They cost about a hundred quid.
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    Combi-boilers, condensing combi-boilers

    Yes, condensing ones. By order of the Deputy Prime Minister.
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    Combi-boilers, condensing combi-boilers

    The boiler can go in the airing cupboard but will probably need to be flued vertically through the roof. It may be a better option to put the boiler up in the loft if possible. It is not an option to get a high efficiency boiler in most cases - you have to have one unless you qualify for...
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    So how much will a new Combi system cost then?

    You had a conversion done and I wouldn't have thought that you were overcharged - it's a lot of work!
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    Blockage in hot water pipes

    The easiest way to do this is to use your washing machine hoses:- Turn off both hot and cold washine machine valve taps. Undo the cold hose at the machine end and the hot hose at the valve end. Have a bucket ready to catch the small amount of water that will inevitably come out. Connect...
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    Newly installed combi

    You need TRVs on all rads except the one closest to the (working) room thermostat. TRVs by themselves are not enough as they will cause the boiler to cycle unnecessarily. If you are replacing the TRVs, don't forget to add new inhibitor. It's all quite cheap and relatively easy to do...
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    Can't get my central heating to refill

    You almost certainly have a blocked cold feed, as previously mentioned. One temporary workaround is to backfill the system using a hose stuffed up the open vent over the header tank. You will still need to manually open the 3PV and bleed the radiators. You should be able to get enough...
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    Ariston 20 MFS Combi - no domestic hot water occasionally

    Is there a question in there somewhere? :)
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    Piping

    yes
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    Pump not running

    Power from boiler to pump OK, power not reaching pump. Have you tried checking the wiring centre?
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    Best Combi Boilers

    Yep, but their reputation is not particularly good on this board. Personally I think they OK for middle of the range gear. And, I'm fitting the 5 year guarantee one next week - 5 years for a combi? I wouldn't expect it to last more than about 7 or 8 tops!
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    Heat loss calculations - advanced sums - clever dick needed!

    Cheers Chris :)
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    Heat loss calculations - advanced sums - clever dick needed!

    Chris I'm not sure that I understand this fully (now I'm sober!). Temperature differential - no problem Where does the figure of 0.5kW per hour per degree come from? How does this relate to total heat loss already calculated? obviously volume is now out of the picture since heat loss was...
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    Heat loss calculations - advanced sums - clever dick needed!

    Chris, fantastic - thanks very much
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    Bathroom rads hot but thermostat is off and hot water is off

    Right you have an "S" plan system. What was the problem again?
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    Baxi Boston Combi Boiler extinguishing flame

    I think he has left the building!
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    Heat loss calculations - advanced sums - clever dick needed!

    Cheers oilman, I know it's a bit of a poser. But I was sort of hoping that there was a standard set of figures or assumptions that could be made based on the known U values for a property.
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    Heat loss calculations - advanced sums - clever dick needed!

    Any interest on this one gentlemen? 8)
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    Baxi Boston Combi Boiler extinguishing flame

    You've just knackered your main burner pressure settings.
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    Mains Water Supply - 15mm Pipe Causing Pressure Problem??

    If you previously had a combi, what was the pressure like before it was replaced?
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