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Formulas to calculate the required power output of a radiator for a room of a specific size. Do they exist?

Arran Cameron
Are there any recognised formulas to calculate the required power output of a radiator for a room of a specific size that also takes into account variables such as extra height, large areas of glass, insulation of walls etc? Good quality formulas devised by people who know about thermodynamics as opposed to plumber's rules of thumb passed down from the 1950s.


Numerous online radiator power outlet calculators exist but the formula behind them is not disclosed and the results for the same input variables vary from website to website.
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    Roy Bowdler:


    It was my understanding that my Bosch refrigerators came of the same production line but had a different plug fitted. Have I been played for a fool? If so, is it the heat engine that is different or the insulation?  

     



    I believe that the state-of-the-art ones were sold in Germany, while the obsolete models that didn't meet the latest standards were sold in the UK.


    That didn't really change until we got energy ratings on appliances and realised that better models were available.
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  • 0

    Roy Bowdler:


    It was my understanding that my Bosch refrigerators came of the same production line but had a different plug fitted. Have I been played for a fool? If so, is it the heat engine that is different or the insulation?  

     



    I believe that the state-of-the-art ones were sold in Germany, while the obsolete models that didn't meet the latest standards were sold in the UK.


    That didn't really change until we got energy ratings on appliances and realised that better models were available.
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