Hello @dave_walker is enable daily pre-processor enabled on emoncms.org but not locally? If so this is likely to be the cause of the difference.
If so the lower SPF figure is to do with the way the energy registers on the heat meter do not subtract defrost heat loss and so present a slightly more optimistic picture than the result from integrating the power data which is the approach taken by the daily pre-processor. The daily pre-processor is more accurate measure of net heat delivered.
A difference of 0.1 SPF over the year is also a common result from the effect of defrost heat loss.
