I was seriously looking at it for a new build until I talked to a few plumbers who all said it's great but make sure you have oil back up!!!!?
And not allowed under RHI rules surely? Certainly the case with my GSHP setup. I've long said we need a small LPG backup boiler secreted in a nearby shed for power cuts or breakdowns.
My installer said it is "possibly" OK as long as there are no actual connections to the GSHP setup... As in a few carefully placed valves However, as I understand that inspections are taking pace on some installs now*, maybe I'll wait until the RHI is finished, as problems (touch wood) have so far been few and far between...
* Pablo will know i am sure...