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Boilers & Hydronic Systems
HVAC SYSTEMS — BOILERS & HYDRONIC
Boilers & Hydronic Heating Systems
We help contractors and facility managers source boilers, hydronic heating components, and radiant heat system parts for residential and commercial applications. Availability may vary by supplier, stock status, and manufacturer policy.
What This Category Includes
ⓘ Boiler and hydronic system sizing requires a heat load calculation. We do not provide engineering or design services. Submit your project specifications for sourcing support.
Gas Boilers
Natural gas and propane boilers for residential and commercial hydronic heating systems.
Electric Boilers
Electric boilers for applications without gas service or where electric heating is preferred.
Hydronic Circulators
Circulator pumps for hot water distribution in baseboard, radiant floor, and fan coil systems.
Expansion Tanks
Diaphragm expansion tanks for closed-loop hydronic system pressure management.
Boiler Controls
Aquastats, outdoor reset controls, zone valves, and boiler management systems.
Radiant Heat Components
PEX tubing, manifolds, mixing valves, and radiant heat accessories for in-floor heating systems.
Sourcing Boilers & Hydronic Heating Systems
Hydronic heating systems — boilers, circulators, radiant floor systems, and fan coil units — are widely used in commercial buildings, industrial facilities, schools, and multi-family residential construction. Unlike forced-air systems, hydronic systems distribute heat through water, offering precise zone control, quiet operation, and compatibility with radiant floor applications. Sourcing replacement components for hydronic systems requires attention to pressure ratings, flow rates, temperature ranges, and system compatibility. HVACProSales helps contractors and facility teams source boilers, circulators, expansion tanks, zone valves, and hydronic controls with the technical specificity that these systems demand.
For facility managers responsible for maintaining aging boiler plants in commercial and institutional buildings, component sourcing often involves navigating discontinued part numbers and manufacturer changes. Circulator pump replacements, for example, require matching flange size, flow rate, head pressure, and electrical specifications. Boiler control replacements require matching aquastat setpoints, safety limit settings, and control sequencing. For any hydronic component replacement, submitting the existing component's part number or specification label along with the boiler model and serial number allows our sourcing team to identify compatible replacements.
Who We Serve: Solutions for Contractors & Facility Teams
Plumbing & HVAC Contractors
Source boilers, circulators, and hydronic components for new installation and retrofit projects. Submit project specifications for sizing and sourcing support.
Facility & Maintenance Managers
Maintain commercial boiler plants and hydronic distribution systems in schools, hospitals, and institutional facilities. Source replacement components to OEM specifications.
Procurement & Sourcing Professionals
Source hydronic system components across multiple brands and equipment generations. Leverage our supplier network for hard-to-find or discontinued boiler parts.
ⓘ Brand availability may vary by supplier, stock status, manufacturer policy, and product type. Boiler and hydronic system installation must comply with local codes and manufacturer requirements. We do not provide engineering or design services. Submit your project specifications, model number, and serial number for sourcing support.
Frequently Asked Questions
Common questions from contractors, facility managers, and procurement teams.
What is the difference between a condensing and non-condensing boiler?
A condensing boiler extracts additional heat from flue gases by cooling them below the dew point, recovering latent heat from water vapor condensation. This achieves AFUE ratings of 90–98%. Non-condensing boilers operate at higher flue temperatures to prevent condensation in the heat exchanger, typically achieving 80–85% AFUE. Condensing boilers require low return water temperatures (below 130°F) to achieve condensing operation and must be installed with appropriate venting and condensate drainage.
How do I select the correct replacement circulator pump?
Circulator pump selection requires matching: flow rate (GPM), head pressure (feet of head), flange size and connection type, voltage and phase, and wet rotor vs. dry rotor configuration. For replacement applications, the existing pump's nameplate specifications are the most reliable starting point. Submit the existing pump model number for a direct replacement lookup.
What causes a diaphragm expansion tank to fail?
Expansion tank failure is typically caused by diaphragm rupture (waterlogged tank) or loss of pre-charge pressure. A waterlogged tank causes rapid pressure cycling, pressure relief valve discharge, and system pressure fluctuations. Test the tank by pressing the Schrader valve — water discharge indicates a ruptured diaphragm. Pre-charge pressure should match the system's cold-fill pressure, typically 12 PSI for residential systems.
What is outdoor reset control and why is it used in hydronic systems?
Outdoor reset control adjusts boiler supply water temperature based on outdoor temperature — higher supply temperature in cold weather, lower supply temperature in mild weather. This improves system efficiency by reducing boiler cycling, extending equipment life, and improving comfort in radiant floor systems. Outdoor reset is particularly effective in condensing boiler applications where lower return water temperatures increase condensing efficiency.
Need Sourcing Support or a Procurement Quote?
Submit your model number, serial number, part number, or equipment label photo for compatibility support. Commercial and contractor RFQ support available.
Contact Procurement Support