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Gas central heating advice - 15mm throughout 9 rad system

Discussion in 'Plumbing and Central Heating' started by julesrules, 11 Sep 2013.

  1. julesrules

    julesrules

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    Hi, can I get opinion on whether you think a combi boiler (Vaillant ecotec pro 28) running 9 radiators in a three bedroomed house would be ok with 15mm copper pipework throughout? My rads don't ever get very hot. Advice would be appreciated. Cheers.
     
  2. Agile

    Agile

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    It all depends on the size of the rads!

    Traditionally it has been the rule of thumb that 15 mm can only supply 3-4 kW but updating to condensing boiler higher differentials would increase that to 5-6 kW.

    A small modern house can easily only have a heat loss of 5-6 kW now.

    "Not ever getting very hot" would imply a too low boiler flow temperature or the max CH power is set too low!

    Tony
     
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  4. julesrules

    julesrules

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    Hi, its a large 3 bed house with 2 reception rooms. Longest radiator is a double 9 foot long. 6 are long, and three are square. Soz, I'm not technical at all.
     
  5. gigz

    gigz

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    I would deffo upgrade some of the pipe work to 22mm, but as tony said make sure boiler is set right.
     
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  7. Agile

    Agile

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    If I was fitting heating to a well insulated larger three bed then I would have 22 mm from boiler to the split to upstairs and downstairs.

    But its surprising how well systems can work when all in 15 mm.

    Tony
     
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