We had a call from a client recently..He'd had 3 "well known" heat pump installers round to quote for a GSHP to his property, but was confused that he was given 3 different pump sizes?? 33kw, 40kw, and 58kw.. To add to the confusion, 1 said that "slinkies" would be OK, the other 2 said that bore holes would be required?
The property is over 100 years old, no DG (and no plans to change), minimal loft ins, and most of the original rads. Interestingly, only one recommended upgrading the rads, and only one suggested that a GSHP wouldn't be suitable, and offered biomass as an option?! I'd be interested to hear some thoughts from a heat pump installer.