We're in a 2 bedroomed terrace, and we've just had a quote for installing a new boiler, the Potterton Promax SL 12 is slightly cheaper (and would require less rewiring, so more convenient).
Can anyone recommend whether the 'Potterton Promax SL 12' or 'Valliant ecotec plus 415' would be better, or are both about the same in quality / running costs?