>>107152826
>you'll have enough heat to warm your house during the night.
Unless your house is thermally insulated so much you're suffocating from CO2 poisoning, a single water tank won't last even a moderately warm evening. Those radiators on your wall are designed to dump heat from the water and are really good at it for obvious reasons. If there's any air exchange with the outside, you have to reheat all that new air and unless you're using electrical heaters on your air vents costing you a lot in electricity, you're going to dump all that hot water tank heat in a couple of hours.
Renewables are too specific for their use cases. When you have to build out for the stuff they aren't good at all you really achieve is learning that the alternatives are better for the general case and you'd have been cheaper not to go solar.