In fairness to all, we don't discuss pricing on the Wall. Thanks for your cooperation.
DHW recirculating pump & Circulator Remote Bulb Aquastat,
Sorry for the newbie question but what function does a Circulatory Remote Bulb Aquastat do with a with hot water recirculating pump? I have this gray box with a dial on it that is connected to my hot water pipe and I have no idea what it does.