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    calculating a combi boiler size

    HI. just refitting an end of terrace 2 bed house, I plan on putting 7 rads in which dependent on type will be from 29,000 BTU to 38,000BTU. Was looking at Vaillant 24 or 28 the outputs seem to be is 78k and 96k respectively. I understand its bad to buy too big a boiler, even the smallest...
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