Increasing radiator output and improving CH performance

Mathew Newton · 2010-10-14T11:14:28+00:00

I would appreciate some advice regarding my thinking-out-loudassessment of our heating system, and the best way to improve itsomewhat if at all possible.I've recently bought a relatively new (2007) 3-bed 2.5 storey semiwhich is obviously very well insulated and given the variety of sizesof radiator appears to have had the heating system designed throughcalculation, even if just following rules of thumb. The radiators,with output figures obtained from similar-looking Flomasta specsheets, are:(Room HxW Type Output)Kitchen 500x700 Double 1048WHall 500x600 Double 898WDownstairs Loo 300x400 Single ~250W? (a real tiny one - I think itlooks great!)Lounge 600x1000 Single 948WConservatory 600x600 Double 1041WFront Bedroom 500x1000 Single 812WRear Bedroom 500x1000 Single 812WGuest Bathroom 600x500 Double 868WTop Bedroom 400x700 Double ~1000W?En Suite 600x500 Single 488WDressing Room 600x600 Single 570WTotal: 8735WThe boiler is a condensing Ideal Icos HE15 (I know - it's probably notthe best place to start but it's what we've inherited and it seems towork well enough so I'm not looking to replace it just yet) which canmodulate between 8.8kW and 14.6kW. It's an S-plan layout run in 10mm(the branches at least - I note the presence of 22mm at the boiler endand within the airing cupboard), with a digital CH stat in the loungeand a sealed indirect cylinder for the HW. The neighbours are onlypresent at the weekend so for all intents and purposes I think theirhouse is unheated most of the time.I have a few issues that I'd like to address:1. Whilst I have yet to perform a full and proper observation theboiler appears to cycle a fair bit even before the house is up totemperature. I am wondering if this is because the total radiatoroutput (even before any necessary derating) is at/below that which theboiler can modulate down to? That is, the system cannot get rid of theheat quick enough so the boiler has no option but to cut out? Asdescribed below I am planning on increasing the size of...

Oct 14, 2010 20 Replies

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Mathew Newton 15 years ago

Thanks Roger. Perhaps if/when I need to replace the current pump I'll bear that type in mind.

Mathew

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Increasing radiator output and improving CH performance

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