Heating

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.

By category

Heating Equipment: Boilers & Furnaces · Heat Pumps · Pumps & Circulation · Heat Emitters · Venting

Hydronic Controls: Zone Valves · Aquastats & Wells · Mixing Valves · Air & Hydro Separators · System Fill & Autofills

Gas & Burner Controls: Gas Valves · Gas Ignition · Thermocouples & Thermopiles · Oil Burner Controls · Fan & Limit Controls

Electrical Controls: Relays · Contactors · Transformers

Thermostats & Zoning: Thermostats · Line Voltage Thermostats · Zone Dampers · Bypass Dampers

Indoor Air Quality: Air Cleaners & Filters · Humidifiers & Dehumidifiers · Ventilation (ERV/HRV)

Cooling & Mini-Splits: Fujitsu General · Line Sets · Condensate Pumps · Refrigeration Tools

By brand: Honeywell Home, Resideo, Taco, US Boiler, Bosch, Fujitsu General.

In season now: see our Heating Season Best Sellers, the boiler, zoning and water heater parts customers order most when the weather turns cold.