I think we might be screwed on water pumps. They're designed to feed out two different lines, one to hot and one to cold... while drawing from the cold source...
Now, the way we designed our system, the cold water is a two-way street... So, theoretically, if we use a pump, we would have to take the pump out of the line each time we want to refill the tank via a hose.
There is a slim chance we could find one that would allow backflow while off... maybe we can find one that does that... but these things generally have check-valves that prevent backflow so you don't end up with with water "slipping back" past the pump's pressure.
Maybe we can figure out a way to make it easy to disconnect/reconnect... like a switching T-Valve connected to a second stretch of hose that is easily switched between... I wonder how hard it would be to do something like that myself. It SHOULD be easier to figure out once the other plumbing work is done, because I'll be able to see what he used for valves and diameters and whatnot.. maybe..
It doesn't seem promising. Maybe we can just hook up the hot water line and let the cold water gravity-feed. That might work.
Anyone know if either of these ideas would work?