Personally I don't think the power supply will be adequate for heating, hotwater, cooking , a kettle, computers TVs , gaming and to top that probably a charging point for a car or two if not now then in the future, I'd be getting a calculation done allowing for a -2- 3 degree temperature outside for a week or two and all these appliances loading it will be a mind blowing and a game changers I guarantee, take some Viessman boiler information with you these are designed for the changes coming to the Natural gas supply, the future is Hydrogen Natural gas mix the co2 produced from the combustion process is vastly reduced it's being trialled and tested in parts of the UK now that the future and the way I would be pushing this customer is this direction , or saying sorry I'm out . Kop