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I'm not convinced by how much value they add to a property. The data there seems a bit vague.
Saying that, if I wanted to install a heat pump I'd need to replace every radiator (they're all a bit underspecced) which would then knock on to a fair bit of redecorating (pipes come out of the walls rather than up through the floor) which would kill any potential ROI.
You don't have to be convinced though. The data is there. I've yet to see one of the naysayers of heat pumps actually show me data where a properly installed system isn't providing savings over a gas or oil boiler.
(That being said I have designed industrial systems whereby there won't be an OpEx saving but in these cases it's because the client has other objectives such as decarbonisation or input energy reduction as a priority).
This is the hurdle people need to get over though. Everyone wants a new kitchen or conservatory but tell me how the ROI is on these projects?