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You don't need to replace any pipework or radiators if you get a modern high-temperature heatpump - it produces water at the same temperature as a gas boiler, so why would you need to change any of that stuff?I can imaging in modern houses where solar is installed as part of the build (that is happening here) and walls and lofts are insulated with far better materials than we used donkeys years ago in our old houses a heat pump will do the job but for the majority of us who live in old houses they wont unless you are prepared to spend thousands of pounds and go through the upheaval of insulating lofts and cavity walls having all the pipework and radiators replaced and finding room for the water tank the easier option is to stay on gas.
The insulation thing is also vastly overstated. If a house is badly insulated, then you're going to be wasting a lot of money whether it's heated by gas boiler or a heat pump - if the house is at 20C and it's 5C outside, then you lose heat, and if it's badly insulated then you'll lose heat faster.The problem with retro fitting heat pumps is most uk homes aren't insulated to the degree needed to be effective.
They work better when designed into construction of new builds, air pressure tests ensure the thermal values are up to standard required.
Like solar installations finding a competent installer is key, not easy for the layman.
But "most uk homes" have enough insulation. The Electrification of Heat project put heat pumps into a representative selection of 742 houses from southern England to Scotland and found that >85% of them didn't need additional insulation, and most of those that did only needed some extra loft insulation - which would have been a good idea with a gas boiler anyway. Only a small handful needed extra insulation like cavity, but it's a complete misrepresentation to think that average houses need extra insulation before installing a heatpump.
a broad spectrum of housing types (41% detached, 43% semi-detached, 11% mid-terrace, and 6% flats) and ages (68% pre-1980). Heat pumps were installed in homes with varying Energy Performance Certificate (EPC) ratings from A down to G. At least 53% of homes involved in the demonstration project had an energy efficiency rating of C or D before the heat pump installation....The Demonstration Project has provided evidence to demonstrate that the large-scale roll out of heat pumps is feasible in the UK and has evidenced that heat pumps can be installed in a wide variety of housing archetypes. Additionally, the Project found a high degree of customer satisfaction with the installation journey and the end-product.