Boiler Parts & Accessories
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WATTS Boiler Header Module Pro , Hydronic Package System (MPN: 235099)SKU: 1970424$751.32 26% off $1,021.31 -
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R.W. Beckett Beckett 51771U Igniter, For use with A, AF, AFG, NX, Thermoplastic (MPN: 51771U)SKU: 95105$66.56 35% off $101.94 -
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R.W. Beckett PSC Burner Motor for use with Beckett AF/AFG/CF375 Burner (MPN: 21805U)SKU: 184015$95.61 26% off $128.70 -
Hoffman 1/8" Adjustable Angle Steam Radiator Air Valve (MPN: 401422)SKU: 1920$66.74 24% off $87.98 -
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Ultra Weil-McLain 383500620 Maintenance Kit, Ultra 155, Ultra 230, Ultra 299, Ultra 399 (MPN: 383500620)SKU: 1888421$78.11 20% off $98.20 -
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Field Controls 4" Stainless Steel Power Venter, 170,000 BTU (MPN: 46275400)SKU: 91811$810.85 22% off $1,042.13 -
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Weil-McLain Pilot Assembly, For use with LGB Series 1-2 (MPN: 511330218)SKU: 15366$83.32 30% off $118.97 -
LAARS P2134400 Manifold Kit, For use with Combi Boiler FTCW 140/199 (MPN: P2134400)SKU: 2020571$314.19 23% off $406.91 -
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R.W. Beckett Oil Burner Primary Control with 15 Second Pre-Purge, Replaces R7184B Relay Controls (MPN: 7505B1500U)SKU: 1880429$111.50 25% off $149.13 -
Weil-McLain Ultra Easy-Up Manifold Kit, Copper (MPN: 383500766)SKU: 1996463$717.59 33% off $1,074.81 -
ECOTEC Weil-McLain 383700343 Easy-Up Manifold Kit, For use with Eco-Tec Boilers 80-199, 383-700-343 (MPN: 383700343)SKU: 2013857$283.97 31% off $409.05 -
R.W. Beckett Oil Burner Primary Control, Replaces R8184G Relay Controls (MPN: 7505A0000U)SKU: 1918013$111.50 31% off $162.11 -
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Taco 1/2" Combination Boiler Feed Valve and Backflow, NPT x NPT (MPN: 566159)SKU: 1979496$116.25 22% off $149.50 -
R.W. Beckett Beckett Electrode kit for use with Models AF, AFG, SR and SF Oil Burners (MPN: 5780)SKU: 2328$25.33 22% off $32.60 -
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Honeywell 40003916-026/U Replacement Head with End Switch, V8043E Series (MPN: 40003916-026/U)SKU: 1721$101.54 10% off $113.27 -
Weil-McLain Inducer Fan Assembly Kit, CGi Boilers, CGs Boilers (MPN: 381356499)SKU: 213599$561.79 24% off $736.49 -
Weil-McLain Ultra U-Control Module, Ultra Commercial Boilers, Ultra Gas Boilers (MPN: 383500658)SKU: 1903082$361.15 27% off $493.91 -
Weil-McLain Blower Assembly Kit, Ultra Gas Boilers (MPN: 383500035)SKU: 1852950$594.23 20% off $742.78 -
Weil-McLain Maintenance Kit, Ultra 80, Ultra 105 (MPN: 383500605)SKU: 1888420$63.51 33% off $95.07 -
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Weil-McLain Igniter Kit, For use with AHE, GV, HE II (MPN: 511330148)SKU: 1309$82.37 26% off $111.36 -
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Weil-McLain Conversion Kit, CG Boilers, EG Boilers, E35 Boilers, E45 Boilers, E40 Boilers, E30 Boilers, E50 Boilers (MPN: 510811458)SKU: 119505$782.92 22% off $1,003.11 -
CGA Weil-McLain 510811980 Conversion Kit, For use with CGa-25, CGa-3, CGa-4, CGa-5, and CGa-6 Boilers (MPN: 510811980)SKU: 2015075$346.02 27% off $473.93 -
Weil-McLain Blower Assembly Kit, Ultra Gas Boilers (MPN: 383500040)SKU: 1852951$667.66 27% off $919.47
Boiler Parts & Accessories
A hydronic heating system is only as dependable as every individual component within it, and selecting the correct boiler parts and accessories is a decision that determines the performance, safety, and service life of the entire system.
Whether you are servicing a cast iron steam boiler in a historic building, maintaining a residential hot water boiler, or commissioning a high-efficiency condensing gas boiler for a new construction project, the integrity of each replacement component directly affects how reliably the system delivers heat.
From hydronic Flo-Chek valves and boiler manifold kits to oil burner primary controls, hot surface igniters, steam radiator air valves, and power venters, this category covers the full scope of components that keep residential and light commercial boilers operating at designed output.
At Plumbing Supply and More, we supply boiler parts and accessories from manufacturers including Taco, Weil-McLain, Watts, Hoffman, R.W. Beckett, Field Controls, LAARS, and Honeywell, offering professional-grade components with competitive pricing and reliable availability.
Why Replacing Worn Boiler Components Preserves Hydronic System Efficiency & Safety
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Every part inside a hydronic heating circuit has a defined service role, and when any single component degrades, the effect propagates through the system in ways that reduce comfort and increase fuel consumption.
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A primary control that cannot execute a clean ignition sequence, a Flo-Chek valve that no longer seals against gravity flow, or a steam air valve with a blocked thermostatic element will each impair the performance of the entire distribution system.
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Understanding the function of each boiler component allows contractors, service technicians, and facility managers to diagnose faults accurately and procure replacement parts before a no-heat call disrupts occupant comfort.
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Regular service with manufacturer-specified components also preserves equipment warranties and ensures that pressure vessel, heat exchanger, combustion system, and hydronic circuit components work together within the parameters the system was designed for.
Hydronic Flo-Chek Valves & Gravity Flow Control in Multi-Zone Baseboard Systems
The Flo-Chek valve is a gravity-operated check valve installed in the supply or return piping of a hydronic zone to prevent thermosiphon circulation when the zone circulator is off.
When pump pressure opens the weighted poppet, hot water flows to the baseboard or fan coil unit served by that zone.
When the pump stops, the poppet falls closed by gravity alone, blocking unwanted heat migration into inactive zones and preventing overheating in rooms that have satisfied their thermostat setpoint.
Taco cast iron Flo-Chek valves are available in ¾-inch, 1-inch, 1-1/4-inch, and 1-1/2-inch pipe sizes, covering both residential baseboard loops and larger light commercial zone circuits.
The 218-3 horizontal Flo-Chek, the 220-6 one-inch model, the 221-6 one-and-a-quarter-inch cast iron valve, and the 222-6 universal one-and-a-half-inch Flo-Chek are each engineered for specific system configurations, and using the correctly sized valve is essential for achieving the design pressure drop and flow rate for each zone.
Air Vents, Steam Radiator Air Valves & Hydronic Air Elimination Components
Dissolved and entrained air is one of the most damaging contaminants in a closed hydronic system, causing corrosion at the waterline, reducing circulator efficiency, and creating air pockets that prevent complete heat transfer in baseboard sections and radiators.
Automatic air vents installed at system high points continuously purge accumulated air without manual intervention, maintaining waterway integrity across the full distribution loop.
The Taco Hy-Vent automatic air vent is rated for installation on water heating systems where air collects at the apex of distribution piping, allowing it to escape through the float-operated valve mechanism as the system reaches operating temperature.
Hoffman adjustable angle steam radiator air valves, including the 401422 and 401434 models, serve a distinct function in one-pipe steam heating systems, where they allow air inside the radiator to discharge during the steam cycle and close against live steam to maintain system pressure.
The adjustable vent rate built into these Hoffman valves gives the service technician direct control over how quickly each radiator fills with steam, which is the primary balancing tool available in a one-pipe steam distribution system.
Boiler Manifold Kits, Header Modules & Pre-Assembled Hydronic Piping Packages
A factory-assembled boiler manifold or hydronic package system standardizes the most complex portion of a boiler piping installation, consolidating primary loop components into a single unit that reduces field labor, minimizes leak points, and ensures hydraulic separation is achieved correctly.
The Watts Boiler Header Module Pro hydronic package systems integrate closely spaced tees, isolation ball valves, and pressure gauges into a pre-engineered module that ships ready for connection to the boiler supply and return ports.
Weil-McLain Easy-Up Manifold Kits include the standard copper series for Ultra Series 4 boilers using 1-1/2-inch piping, and the dedicated ECOTEC kit for Eco-Tec boilers in the 80 to 199 MBH range, each precisely matched to the flow and temperature specifications of the boiler platform.
The LAARS combination heat and hot water manifold kit for firetube wall-mount combi boilers simplifies the piping interface for domestic hot water priority and space heating in compact wall-hung applications where installation space is at a premium.
Selecting the manifold kit specified for your exact boiler model eliminates field measurement errors, ensures hydraulic separation is correctly implemented, and maintains compliance with manufacturer installation requirements.
Oil Burner Controls, Electronic Igniters & Electrode Kits for Oil-Fired Boilers
The ignition circuit of an oil-fired boiler must produce a reliable, correctly positioned spark at the electrode tips to atomize and ignite the fuel-air mixture during each burner cycle, and wear in this circuit is among the most common causes of hard lockout and service calls.
R.W. Beckett offers a comprehensive range of oil burner service components including the 51771U electronic igniter, which is compatible with A, AF, AFG, NX, and Thermoplastic burner platforms, delivering a high-voltage arc to the electrode assembly at the start of each ignition cycle.
The Beckett electrode kit (MPN 5780) is designed as a direct replacement for AF, AFG, SR, and SF burner models and includes factory-set electrode positioning that eliminates alignment guesswork during field service.
Oil burner primary controls govern the entire burner operating sequence, including pre-purge, ignition, flame proving, and safety lockout.
The Beckett 7505A0000U replaces the Honeywell R8184G relay control, while the 7505B1500U adds a 15-second pre-purge function that clears the combustion chamber of unburned fuel vapor before the ignition transformer energizes.
PSC Burner Motors, Inducer Fan Assemblies & Power Venters for Combustion Airflow
Combustion air management directly determines the fuel-to-heat conversion efficiency of any oil or gas boiler, and failures in the blower, inducer, or flue venting assembly compromise both heating output and flue gas safety.
The R.W. Beckett 21805U PSC burner motor is the direct replacement for the fan and motor assembly in Beckett AF, AFG, and CF375 burners, providing the rotational speed and torque required to deliver the correct air-to-fuel ratio at the combustion head.
The Weil-McLain inducer fan assembly kit (MPN 381356499) is matched to CGi and CGs series boilers, where the sealed combustion inducer creates the negative pressure needed to draw flue gases through the heat exchanger sections and into the venting system without spillage.
Field Controls 4-inch stainless steel power venters rated at 170,000 BTU input are used where natural draft is inadequate or where direct sidewall venting is preferred, providing forced evacuation of combustion products independent of chimney draft conditions.
Adding a properly rated power venter improves combustion consistency, reduces chimney heat losses, and allows more flexible boiler placement in mechanical rooms that lack access to a traditional masonry chimney.
Blower Kits, U-Control Modules & Electronic Controls for High-Efficiency Condensing Gas Boilers
Condensing gas boilers achieve high Annual Fuel Utilization Efficiency ratings by using modulating combustion controlled by sophisticated electronic modules, and maintaining original component specifications in these systems is essential for sustaining rated performance.
The Weil-McLain blower assembly kit (MPN 383500035) for Ultra 155 series boilers provides the variable-speed combustion air blower that the modulating control algorithm requires to maintain a stable air-to-gas ratio across the full firing range.
The Ultra U-Control Module (MPN 383500658) manages ignition sequencing, outdoor reset, domestic hot water priority, cascade control in multi-boiler systems, and fault diagnostics for Ultra series and Ultra commercial boiler platforms.
Because the combustion algorithm in a condensing boiler is calibrated to the specific fan curve and heat exchanger geometry of each model, replacing these components with original manufacturer parts rather than generic alternatives is essential for preserving efficiency ratings and control system stability.
Annual Maintenance Kits, Hot Surface Igniters & Pilot Assembly Replacements
Scheduled preventive maintenance with complete manufacturer-supplied kits is the most cost-effective way to extend boiler service life and prevent mid-season failures that result from deteriorating ignition, sealing, and sensing components.
Weil-McLain maintenance kits are sized specifically for Ultra 80, Ultra 105, Ultra 155, Ultra 230, Ultra 299, and Ultra 399 boilers, with each kit containing the hot surface igniter, flame sensor rod, gaskets, and O-rings required for a complete annual service.
The Weil-McLain pilot assembly (MPN 511330218) for LGB Series 1 and Series 2 cast iron boilers provides a complete replacement of the standing pilot circuit, including the pilot burner orifice, bracket, and thermocouple lead assembly.
The Weil-McLain igniter kit (MPN 511330148) for AHE, GV, and HE II boilers replaces the silicon nitride hot surface igniter and associated hardware in a single kit, ensuring the ignition circuit returns to full specification after service.
Using a factory maintenance kit rather than individually sourced components ensures full material compatibility, simplifies inventory management, and supports compliance with manufacturer warranty service requirements.
Gas Controls, Combination Feed Valves & Backflow Prevention in Hydronic Systems
The gas control valve and the boiler feed valve are among the most operationally critical components in any hot water boiler installation, and replacing them with correctly specified parts is essential for safe, code-compliant operation.
The Weil-McLain EG gas control (MPN 381800823) is engineered for EG30-50 PIDN boilers, combining electronic valve actuation, manual shutoff, and main gas pressure regulation in a single compact body matched to the gas train design of that boiler series.
The Taco combination boiler feed valve and backflow preventer (MPN 566159) integrates a bronze body pressure-reducing valve with a dual-check backflow preventer to maintain correct system fill pressure while protecting the potable water supply from cross-contamination.
This type of combination fill assembly is required by most plumbing codes and eliminates the need for two separate components, reducing piping complexity, potential leak points, and installation labor.
Tankless Heater Coils, Magnesium Anode Rods & Zone Valve Actuator Heads
Domestic hot water production through a tankless coil inserted into the boiler pressure vessel is one of the oldest and most energy-efficient methods of combining space heating and water heating in a single appliance, and the coil must be maintained to sustain this function.
The Weil-McLain tankless heater coil (MPN 590921612) is matched to WTGO-3 through WTGO-6 oil boilers and is constructed of copper tubing cast into an iron jacket that immerses directly in the boiler water for maximum heat transfer.
The magnesium anode replacement kit (MPN 633500014) for Weil-McLain AquaPlus indirect water heaters contains the sacrificial anode rod that protects the glass-lined tank from electrochemical corrosion, extending tank service life when replaced at the manufacturer-specified interval.
The Honeywell replacement head with end switch for V8043E series zone valves provides the complete actuator and end-switch assembly that signals the boiler and zone circulator when the valve has fully opened, closing the control circuit and enabling heat delivery to that heating zone.
The end switch function is critical in systems using boiler-priority control sequencing, where the zone valve end switch is the primary signal that authorizes the burner to fire and the zone pump to start.
Shop Boiler Parts & Accessories at Plumbing Supply And More
Plumbing Supply and More maintains a comprehensive inventory of over 180 boiler parts and accessories to support both planned maintenance and emergency service across residential and light commercial hydronic heating installations.
Whether you need a Taco Flo-Chek valve for a baseboard zone, a Weil-McLain blower assembly for a high-efficiency gas boiler, a Beckett primary control for an oil burner, a Hoffman steam radiator air valve for a one-pipe steam system, or a Watts hydronic header module for a new multi-zone installation, this category provides the components you need.
All products are sourced through authorized distribution channels to ensure manufacturer warranties remain valid and every component meets published performance and safety specifications.
Order with confidence knowing that Plumbing Supply and More delivers competitive pricing, deep inventory, and professional product selection to keep your boiler service and installation projects on schedule.
About the Author: Rick Callahan is a recognized professional in HVAC and plumbing distribution with more than twenty years of professional background. His expertise help professionals and property owners master the complicated realm of supply chain management and equipment selection.
