I'm planning an installation for heating water using solar "exchanger" panels (solar used to heat water directly, not through electricity). I don't want to bind the reservoir, panel and tap locations to the natural circulation cycle though (hot water traveling up etc).
So, in order for this to work, I'd have to force some very slow water circulation between the reservoir and the panels; a pump that takes very little power and provides very small but constant throughput: something with power requirements low enough to make this economically viable, maintenance-proof and preferably silent. On the other hand, the throughput can be very low (the water in the panel must be given enough time to heat up, so I guess even something like 10cc/min is satisfactory) and it will work only with clean, drinking quality water and very low pressures (just enough to have the water moving through pipes, no resistances or height pressure to overcome).
Do you have any idea what pumping mechanism could I use for that?