Controls accessories for heating equipment: relays, sensors, mounting hardware, treatment chemicals and miscellaneous replacement parts.
Most of what sits here is the small hardware a control job needs and nobody stocks — the relay that isolates a low-voltage thermostat from a line-voltage load, the immersion well that lets a sensor read water temperature without being in the water, the bushings and adapters that let a sensor fit a port it was not made for.
Two notes that prevent the common mistakes. A relay has to be matched on both sides: coil voltage to the control circuit, contact rating to the load being switched. And an immersion well has to be filled with conducting paste and the sensor seated to the bottom of it, or the sensor reads the air in the well instead of the water and the control responds late.
Boiler treatment chemicals belong to closed hydronic loops only. Anything on a potable line has to carry a potable certification.
Brands include Navien, DiversiTech and tekmar.
