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- 10 Dec 2010
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rough idea please cold bedroom i have 900 x 600 single radiator 1m2 of window area stone built cottage 8.2m2 floor area 18m3 volume. 3 outside walls, according to the radiator size i have its about 923w and i calculate 984w, looking to replace with possibly a double does this sound as if it will be better heat... 1609w....