Overall the cost may not be that much but the bigger shift is to electrification of heating instead of a gas burning boiler, as electrical systems can take adva

Overall the cost may not be that much but the bigger shift is to electrification of heating instead of a gas burning boiler, as electrical systems can take advantage of power from offshore wind / solar etc. another way of looking at it is most people will replace their boilers in the next 20-30yrs, if they can get a electrical heat pump system they should (and the governments should make this economically advantageous to do so).