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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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    I also add the question - are radiators supposed to have a difference in temperature of 10 degrees C between the inlet valve and the outlet valve?
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    I also add the question - are radiators supposed to have a difference in temperature of 10 degrees C between the inlet valve and the outlet valve?
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