ASHP people, did you go and replace all the radiators and piping throughout the house?
Rads will almost certainly need replaced with bigger. If the pipework is 15mm or more you can reused it, but ASHP are all about marginal gains of economy so larger bore pipe and short runs are better.
Marginal gains are surely completely wiped out by the cost of replacing stuff, I would have thought?
@dbr started
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ASHP people, did you go and replace all the radiators and piping throughout the house?