coolmom42 wrote:
DrewE wrote:
If you have a winterize setting, to pump antifreeze from a bottle, you can use that to pump water from a container into the tank. It's not the fastest operation ever. Just set the valves for winterization and open the fill valve and turn on the pump.
Seems to me if this were correct, a person would have to fill the water tank with antifreeze, in the process of winterizing.
There is normally a check valve on the tank side of the pump to keep water/antifreeze from flowing backwards into the tank.
The fill valve connects the pressure side of the water system (after the pump) to the tank, allowing city water to flow into the tank. When closed, the check valve in the pump prevents this flow, as you note. For normal winterization, the fill valve is not kept open, and the tank does not fill with antifreeze. (It probably would be a good idea to briefly open it to force any water in the fill line out, and thus get a very small amount of antifreeze in the tank.)