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For hot water only, or heating only, or both? Electricity via overnight tariff, or PV array (existing or new)?
Ours was very cheap (~£6k installed), but was part of of a bigger job to plumb a new build Passivhaus via a sub-contractor. We actually saved money overall (compared to a traditional build) as our plumbing became VERY simplified: PV/overnight to SunAmp to hot water only, no tanks, no underfloor, no rads.
JonoMarshall
How much is a Sunamp system to install?
I’ve given up on the idea of an AS heat pump; too pricy and not feasible in a draughty Victorian house without massive insulation upgrades...