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help with load calculation results

FrankR Member Posts: 3
Can anyone tell me how to size a new boiler for my house. I've had several radiation studies done with wildly different results. One study was done by counting all radiators (size number of tubes and sections) in the house and measuring the rooms and another one was done by mesuring rooms, doors and windows. I have a hot water oil fired boiler and I am more confused now then ever


  • Big Ed_4
    Big Ed_4 Member Posts: 2,806
    edited May 2012
    Heat Load

    Hot water system boilers are first sized by measuring the envelope of the building ... measuring door walls and windows ... This would give you the BTU needed on the coldest day .

    If radiators in home are larger then what is needed then lower water temperatures can be used to heat the home .

    Measuring radiators are used for steam systems , to produce enough steam to fill the whole system ..

    If boiler also produces the homes domestic hot water .. You may need to adjust size for it ... Depends on your want and needs ...

    Hope this helps

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  • FrankR
    FrankR Member Posts: 3

    Big Ed

    Thanks for the explaination, I'm a little less confused now
  • SWEI
    SWEI Member Posts: 7,356
    A corollary

    Sizing a hot water boiler by measuring radiators alone is WRONG.
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