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Adding Radiators to existing system

Discussion in 'Plumbing and Central Heating' started by LittleJoe, 19 Mar 2021.

  1. LittleJoe

    LittleJoe

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    Hi
    I am considering adding 2 extra radiators to my existing house. One in the conservatory and an extra one in the kitchen. I have a Potterton Performa 24 ECO He Condensing Combi Boiler which I believe has a 25.2kW Output and a 9.8 l/min flow rate. The existing system is plumbed with 10mm Hep2O polypipe. There are currently 9 rads around the house. I would appreciate if anyone could advise if the Boiler and system should cope OK?

    Many thanks.
     
  2. cross thread

    cross thread

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    Boiler is big enough, pipe work we have no idea of your layout
     
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  4. LittleJoe

    LittleJoe

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    Thanks Cross Thread. What are the considerations you are thinking of with regard to the layout? Are you thinking of just the practicality, location of pipes, length of pipes etc.?
     
  5. oldbuffer

    oldbuffer

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    1. If you put a radiator in a conservatory I believe it has to be on its own zone.
    2. When you say the system is piped in 10 mm microbore, do you mean all of it, or just the visible pipes leading into the radiators. I'd be very surprised if there isn't a "spine" of 22 mm pipework feeding the system, with 10 mm to each radiator, perhaps off a manifold.
    3. If the system really is piped wholly in microbore, I'd question its ability to cope with additional radiators, as the pipework probably couldn't shift the heat at a sensible flow rate.
    4. If there is a spine, you would be well advised to run new radiators from that spine, not try and piggy back off existing radiators.
    5. A rule of thumb for radiators is an average of 1.5 kW each, suggesting that your current load is around 14 kW. If so, this leaves plenty of boiler capacity for the additions.
     
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  7. LittleJoe

    LittleJoe

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    Thanks for your comments Oldbuffer. You are correct that the core system has a 'spine' of 22mm and 10mm 'spurs' feed off to individual rads. I'll bear in mind your comments about feeding off the spine and not piggy backing.
     
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