5/16 ′′ −18 Stainless Steel Acorn Nut 5-Pack (P/N 5000039)
$4.87This 5-pack of 5/16 ′′ −18 stainless steel acorn nuts (p/n 5000039) is used for securing furnace components.
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This 5-pack of 5/16 ′′ −18 stainless steel acorn nuts (p/n 5000039) is used for securing furnace components.

This 10-pack of 5/16 ′′ −18 x 1 ′′ stainless steel bolts (p/n 5000036) is used for securing furnace components .

This 5-pack of 5/8 ′′ −11 hex nuts (p/n 5923) is a zinc-finished replacement component used for secure fastening.

This 5-pack of 5/8 ′′ −11 high crown cap nuts (p/n 4630) is zinc-finished for securing door latch assemblies.

This kit (p/n 2500044) reinforces the 6 ′′ chimney base when three or more chimney sections are used .

This attachment ring (p/n 774) reinforces the 6 ′′ chimney (when 5 or more sections are used) and must be located below the locking band (p/n 6500011) .

This band clamp (p/n 9535) is used exclusively on 6 ′′ Central Boiler double wall pipe to reinforce section joints .

This locking snaplock clamp (p/n 6500011) must be used at each joint of 6 ′′ chimney sections (p/n 6500004) .

This band (p/n 776) attaches to a 6 ′′ chimney to hold three guy-wires (sold separately) for stability reinforcement .

This 4-foot, Type HT listed 6 ′′ stainless steel chimney section (p/n 6500004) requires the p/n 6500011 snaplock clamp at each joint .

This kit (p/n 4519) is used to reinforce the 8 ′′ chimney base when three or more sections are installed .

The p/n 6757 adapter kit allows Classic furnaces with a square chimney box to use the standard 8 ′′ Chimney Extension .

This immersible, adjustable aquastat (p/n 169) operates between 110−240 ∘ F and features 1/2 ′′ MPT fittings on its well .

The Baseboard Joiner (p/n 230) is used to cover and conceal joints in continuous lengths of radiant baseboard .

This Air Handler Cabinet (p/n 301) for 100k−140k Btu systems features front water access and requires separate blower/motor, coil, and filter .

This close-off plate assembly (p/n 2500241) replaces the primary air intake for all E-Classic and Classic Edge models with steel elbows, and the E-Classic secondary air intake (except 1450) .

This kit (p/n 9268) provides the necessary components for replacing the furnace’s air proving switch .

This black iron tee (p/n 133) features 3/4″ NPT threads and is commonly used for pump venting options.

This 3/4 ′′ MPT brass hose bib (p/n 199) requires a separate cap (p/n 5348) and washer (p/n 5349) to cover the end .

This 3/4 ′′ x 2 ′′ brass nipple (p/n 535) is used for plumbing connections, as brass must be used on stainless steel furnaces .

This 3/4″ x 7″ brass nipple (p/n 536) is used for plumbing connections on stainless steel furnaces.

This 5-pack of brass caps (p/n 5348) is used with a washer (p/n 5349) to seal the end of a 3/4 ′′ MPT hose bib .

This 1/2 ′′ x 1/8 ′′ NPT Brass Reducing Bushing (p/n 3042) connects pipes of different thread sizes .

This 3/4 ′′ Brass Swing Check Valve (p/n 296) with FIP fittings prevents reverse water circulation in the furnace system .

This cleaning rod (p/n 317) is used for removing debris from the burn chamber of M250/255P models .

Industrial-grade 1-HP 3-speed blower motor delivering 2701 CFM for Central Boiler outdoor furnaces.

This is a pack of 10 1 ′′ stainless steel hose clamps for reliable connections in the Central Boiler system .

This stainless steel hose clamp (p/n 5000638) is the specific clamp for securing 25mm PEX hose .


Shop the Central Boiler 3/4 Medium Density Braid Rope for seals and coverage. High-quality OEM parts available with fast next day shipping.

This is a Type HT listed, 8 ′′ x 48 ′′ stainless steel chimney section for outdoor use on various Classic, E-Classic, and Classic Edge models .

Replacement safety door switch (p/n 8932) for Central Boiler furnaces. Fits Firebox and Reaction Chamber doors.

Ensure optimal airflow and efficient heating with a genuine OEM stainless steel air charge tube. Select the correct tube for your E-Classic or Classic Edge model.

Universal OEM air intake assembly compatible with the full range of Central Boiler Edge 350 to 960 models.

This complete maintenance bundle includes 3 containers of Ashtrol Firebox pH Modifier and 2 gallons of MolyArmor 350 Corrosion Inhibitor to protect both the firebox and water jacket of your Central Boiler furnace.

Central Boiler ASH TROL-MC firebox treatment designed to modify pH levels and prevent corrosion in Classic and Edge models.

A high-quality OEM replacement electrode assembly designed for reliable ignition in Central Boiler CL 5693 Dual Fuel Burners.

A complete genuine replacement combustion air tube kit designed to improve airflow and efficiency in Classic Edge HDX 960 models.


This is a direct replacement digital temperature controller for Classic furnaces after s/n 25151, featuring a customizable 10 ∘ operational window .


This is a direct replacement digital temperature controller for Classic furnaces after s/n 25151, featuring a customizable 10 ∘ operational window .

Standard threaded fittings kit (P/N 2053) for installing a water-to-water heat exchanger onto a domestic water heater.
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