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Discuss Boiler size estimate in the Oil and Solid Fuel Forum area at UKPlumbersForums.co.uk.

  1. Bogart

    Bogart Member

    Considering replacing old Camray with a new unit. Have approximately 25kw of rads installed plus say 3kw for the hot water tank giving 28kw. Now the boiler is some 15 metres from the house feeding in 35mm copper insulated pipe under a lawn. In the very near future I will change this for a properly insulated twin pipe setup. Is my estimate of a 32kw or 36kw boiler enough or should I aim higher say a 36?46kw ?
     
  2. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    How many rads also copper cylinder?
     
  3. Bogart

    Bogart Member

    20 rads and copper cylinder. Have worked out rad load using the normal delta 50
     
  4. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    I would go with a 36kw could always range rate it down

    But I would do the insulated pipe first least you know your coupling onto good pipe and not swish cheese
     
    • Like Like x 1
  5. noelm

    noelm New Member

    Many years ago I did something similar moving the Boiler out to a detached garage to gain kitchen space. The distance was about 40 Ft and buried about 2- 2.5 Ft. I insulated it well but the heat loss was massive. The Boiler nearly ran continuously in Deep winter. Ended up replacing the Boiler with a Wall hung back in the kitchen.
    I wouldn't do it without the new specialist insulated pipe. With a heat loss of less than 1%.
     
  6. Bogart

    Bogart Member

    Only been here a year and so much to do so the replacement insulated pipe will wait till next year. I was surprised last winter at how little it showed re heat loss. I thought after every frost I would see 2 green lines across the grass not so.
     
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