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We used to chop wood for the hot water growing up. Glad I don’t have to do that now.
A heat pump hot water system can be run from PV with inverter if you have excess and often is. That is because a heat pump draws only 1 kw and can run from a 10amp circuit if no booster is used. Some models are designed to be PV connected and have specialised circuits . Old school plumbers do not like heat pumps as there are some shocking cheap ones out there and they can’t be fixed by a plumber but I have had one for 20 years running on 10 amps. My next installation will have the heat pump run on PV.
You would still need enough PV and inverter but this can be done I understand, will not be cheap, and if you are in an area with subzero overnight temperatures your options are limited to models with efficient refrigerants that tolerate sub zero.
I am surprised your fuel stove system does not also include a solar hot water system as my sisters’ house in the country had.
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