I'm thinking of switching from my oil boiler (firebird 120 circa 800 euro) to a rock bore ground collector. The house is early ready to move in to and I've underfloor throughout. I realise now the boiler is not as efficient as a combi condensing so would it be a good idea to cut my losses and sell off the boiler as nearly new (300 l burned) and install a heat pump.The boiler is located in the garage 7m from the house - site is on rock (should I be concerned about vibration from the rock bore affecting the building) and what grants are available for this - can't find the info or link from the sei.i homepage.Any comments/suggestions appreciated.