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@artg There are currency-hedged ETFs but you need to have a clear idea of what it is you’re doing and why. The pound could easily keep falling.

@calso If only they knew! Not sure anyone could have predicted the Truss Fiscal Event, for example.

@rom1974 I fucked up my power is what I did. Never accept any calculations done on a Friday afternoon. Let me just redo that one. I assumed heating power of 350 * (heating degrees) to make the peak demand fit, average radiator temperature of 2.5 degrees below flow temperature and (T_rad -...

@rom1974 In response to the question of peaks - it is an issue, but I think it's less of an issue than it's made out to be. In practice most people are OK with their houses being a couple of degrees colder on a few days of the year. Maybe that's undesirable, but it would be a change to expect...

@rom1974 Yes, the very long shoulder season in the UK is what enables these high SCOPs. I'm sure there's an 'official' method, but for a quick look I used PVGIS to generate a typical meteorological year's worth of hourly temperatures for somewhere in the middle of England. Ranked those and...

@rom1974 Yeah, some of the hydronic heat pumps have got to a point where a SCOP of 3 is possible even with a peak flow temperature over 50C, which is just about doable with most existing central heating systems. Still, mini splits are unreasonably effective and super quick to install - I'm...

@ghaynes TL/DR: heat is expensive but heat pumps can be big. Low temperature is more efficient but achievable using using big, powerful fan-coils rather than rads/UFH. Insulate if it's easy but don't let that put you off heat pumps. A single box that replaces every boiler isn't possible but this...