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My old Apollo 50Si boiler is on it's last legs & I'm browsing for a suitable (heat only) replacement. However I'm a little confused about the KW ratings. To purchase a new boiler with similar performance which figure from my old boiler should I use as it has 2 ratings - 18.3KW input & 14.7KW output. As current boilers only seem to be advertised with 1 rating should I be looking at a 15 or 18KW unit?
Many thanks.
Many thanks.