Thanks for the info Ted.

So as I understand it if I take the EPC figure as is, get an MCS guy in to do all the calculations and come up with a SPF (say 3.2 for a GSHP) do the math and come up with a SPF of 0.68

Taking the EPC figure of 30546kWh per year and the SPF I end up with 20771.28kWh

GSHP RHI of 18.8p / kWh

Gives an annual RHI payment of £3909.00 for 7 years.

The down side is I assume I have to have a GSHP sized to give that sort of insane heat output which will cost more?

One last question do I have to do anything else in terms of installing energy saving measures before installing the GSHP and claiming RHI?

Do I rigorously persue the EPC and try to get the figure down?

Hi

The SPF for Heat Pump installations is calculated solely from the Radiator/UFH flow temp from the Heat Emitter Guide -

http://www.microgenerationcertification.org/images/MIS_3005_Supplementary_Information_2_-_Heat_Emitter_Guide_v2.0_Print_Version.pdfSo if your flow temp is 40 Degrees with a GSHP you will be assigned an SPF of 4.1 [3.4 with an ASHP], this gives a correction factor of 0.756 for the Calculation of renewable heat = 23095kWh = £4341 a yr = £30,393 in total.

If you pursue a lower EPC figure, you may help your pride, but you will get less RHI. The only advantage of a lower EPC figure would be if you were selling your property, which you are obviously not.

Alan

PS Your EPC figure will have no bearing on the size of the heat pump, your MCS installer will work that out from heat loss calcs.