Most folk will only change their heating system when the old one fails.
As most domestic heating is with gas boilers this is likely to take 20+ years. Flats which tend to be electric won't have the space to install heat pumps.
Even after the government subsidy, the cost to instal a heat pump system (including radiator and pipework alterations) far exceeds the cost of a new gas boiler - makes it a non-starter for most!
The only question - do we applaud them for trying or criticise them for failing?
If we don't try we will never succeed. Innovation involves risk. Fortunately the cost of failure has been less than the original budget, unlike (say) HS2 where the cost of failure has seen the budget multiply several fold.
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