In fairness to all, we don't discuss pricing on the Wall. Thanks for your cooperation.
Adding a Taco SR501 to a existing SR503
Have an existing furnace with 3 current zones, two heat zones, and a DHW tank zone all controlled by a Taco SR-503 and Hydrostat Model 3150. I am adding a heating zone in my basement and have a Taco SR-501 I would like to wire in but not positive on how it should be wired into the existing system.