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BTU requirement per Sq feet
I was referred to this site by a friend of mine who couldn't answer this question: How many BTUs are needed to heat ? square feet of housing (in cooling terms it was stated that 12,000 BTUs per 500 square feet of house).
I have an old boiler (~1964 weil mcClaine) and a new addition (built 20 years ago and heated with radiant heat panels). I want to put a new forced baseboard loop into the addition but don't know if my boiler can handle it.
I appreciate any input.