I have a portion of my bypass water going to the SS heater coil in my woodstove and since it goes high above the rest of the system in order to clear a doorway I ran into some issues. All goes according to plan once I force the water up and over. However if there is a power interruption either by me or the power lines I immediately loose the prime and the coil is emptied and soon overheats and melts the pvc fittings.

So what I needed was a check valve that would not create any back…