steve573 submitted this idea :
Is
there a great difference in costs in keeping it on all the time when it
only kicks in now and again to keep the CH water hot or leave it off
overnight and when we are at work even though it then uses lots more
oil to heat the CH water up to temp and to get bthe house up there too.

Obviously keeping it on will cost more, how much more will depend upon
heat loss through the buildings fabric. The poorer the insulation, the
more of the heat will be lost/wasted.

Rather than turning it off completely, could you perhaps use a set back
temperature - which would reduce the cost dramatically?

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Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.co.uk