The hose from the return is a different size than thehose from the pump. I stuck the hose from the return into the one from the pump and duct taped them toegether. I need to go find a fitting to hook them together with. Is duct tape ok for now?
I wouldn't leave them it running that way while you are out of the house.
Do you have a ball valve that you can turn off until you have the correct fitting? Just keep flow (using powerheads), heat going in the DT and turn it on when you come back?