I am going to make a winter hot water system for my cabin.
In summer, we have spring water, a 1,000 gallon tank, and a 30 gallon
propane hot water heater. In winter, we haul up two or three 55 gallon
barrels of fresh water at a time. We pump it to tanks in the attic. That
lasts us about a week.
On the cold water side, we just use gravity feed to temporary winter spigots
in kitchen and bathroom. I want to make a hot water side. I intend to do
this with a two gallon hot water heater and a 12V. RV pump. The HWH is
110v. I would hook up the RV demand pump between the tank and the HWH so
that as water is used, the pump would refill the tank.
Has anyone ever used a system like this? It will be for light seasonal use,
just for some hot dish water and a quick shower.