Hydronic and forced-air heating: boilers, circulators, zone valves, mixing valves, aquastats, manifolds, expansion tanks, venting and the controls and replacement parts that tie them together.
Boilers stocked here run from under 50,000 Btu/h through 200,000 Btu/h and above, with the 100,000–200,000 band the deepest. Modular condensing units sit alongside conventional cast iron. Venting is the specification most often missed on a condensing swap — a 90%+ appliance produces acidic condensate and requires PolyPro, PVC or stainless, never the galvanized flue a mid-efficiency unit used, and the vent diameter is set by the manufacturer's tables, not by the old pipe.
Connection sizes cluster at 3/4" and 1" for near-boiler piping, in press, sweat, NPT and flange. Cast iron circulator bodies are for closed loops only; anything potable needs stainless or bronze.
Brands include Resideo, Taco, US Boiler, Centrotherm and MR PEX.
