In an earlier posting, I described a situation where I have a solar water tank on the roof. I used the approach of connecting the solar tank with a holding tank in the basement before distributing to the rest of the house. Valves are used to allow solar tank water to feed the holding tank.
I'd like to circulate the water between the solar and holding tank during the day to keep the holding tank with hot water as the solar collectors picks up the sun's heat. Can you recommend a "simple" circulation pump that can move water 33 ft between the 2 tanks because the solar tank is not pressurized.
Preferrably the pump can run off a small solar panel so circulation occurs when the sun is out.