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Will need to be some grant to bring the cost down to the same price and even then how long can that be sustained as there isnt an unlimited money tree for things like that.
Saying that, you get the HP installed and in 10-15 years when it needs replaced and is 10 grand to replace it will people have the money to get it done. People aint spending 2000 odd the now to replace old boilers so I feel like it'll be the same old thing again but worse.
Not always an option though. If grants make it cost the same as a straight swap new boiler, then all good, but if you need to have a spare load of extra cash that you can convert to property value rather than food it gets in the way quite a lot.