Boiler System Accessories

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DOE Heating Capacity (BTU) Learn More
DOE Heating Capacity (BTU)
Also referred to as Gross Output, this is the output of a boiler after accounting for combustion efficiency. We recommend sizing hot water boilers based on the DOE Heating Capacity.
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Number of Zones Learn More
Number of Zones
A zone is a room or area within a building that has its own temperature control.
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Maximum Number of Zones
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Maximum Input Capacity (BTU) Learn More
Maximum Input Capacity (BTU)
The Maximum Input Capacity describes how quickly the appliance will use fuel when delivering it's maximum capacity. The units may change depending on the fuel being used.
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Caleffi Air & Dirt Separator, 1" NPT Male Union Connections
Item#: 24429
Model#: 546016A
Brand: Caleffi
$355.00
Free Shipping
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*This product qualifies for Free Shipping anywhere in the contiguous US. Accessories may ship separately. Items over 100lbs shipped via semi-truck, be sure to select "Lift Gate" to lower the product to the ground curbside. Remote area surcharges map apply, see our full shipping policy for more details.
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Caleffi Discal Air Separator with 1/2" Check Valve, 1-1/2" NPT Female Connections
Item#: 24528
Model#: 551008AC
Brand: Caleffi
$361.00
Free Shipping
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Free Shipping
*This product qualifies for Free Shipping anywhere in the contiguous US. Accessories may ship separately. Items over 100lbs shipped via semi-truck, be sure to select "Lift Gate" to lower the product to the ground curbside. Remote area surcharges map apply, see our full shipping policy for more details.
Factory-Direct
Caleffi Discal Air Separator with 1/2" Check Valve, 2" Sweat Connections
Item#: 24533
Model#: 551054AC
Brand: Caleffi
$419.00
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Free Shipping
*This product qualifies for Free Shipping anywhere in the contiguous US. Accessories may ship separately. Items over 100lbs shipped via semi-truck, be sure to select "Lift Gate" to lower the product to the ground curbside. Remote area surcharges map apply, see our full shipping policy for more details.
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Caleffi Discal Air Separator with 1/2" FNPT Bottom Thread, 1-1/2" NPT Female Connections
Item#: 24537
Model#: 551008A
Brand: Caleffi
$354.00
Free Shipping
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Free Shipping
*This product qualifies for Free Shipping anywhere in the contiguous US. Accessories may ship separately. Items over 100lbs shipped via semi-truck, be sure to select "Lift Gate" to lower the product to the ground curbside. Remote area surcharges map apply, see our full shipping policy for more details.
Factory-Direct
Caleffi Discal Air Separator with 1/2" FNPT Bottom Thread, 1-1/4" NPT Female Connections
Item#: 24539
Model#: 551007A
Brand: Caleffi
$273.00
Free Shipping
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Free Shipping
*This product qualifies for Free Shipping anywhere in the contiguous US. Accessories may ship separately. Items over 100lbs shipped via semi-truck, be sure to select "Lift Gate" to lower the product to the ground curbside. Remote area surcharges map apply, see our full shipping policy for more details.
In-Stock
Caleffi Discal Air Separator with 1/2" FNPT Bottom Thread, 1-1/4" Sweat Connections
Item#: 24540
Model#: 551035A
Brand: Caleffi
$259.00
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Free Shipping
*This product qualifies for Free Shipping anywhere in the contiguous US. Accessories may ship separately. Items over 100lbs shipped via semi-truck, be sure to select "Lift Gate" to lower the product to the ground curbside. Remote area surcharges map apply, see our full shipping policy for more details.
Factory-Direct
Caleffi Discal Air Separator with 1/2" FNPT Bottom Thread, 2" Sweat Connections
Item#: 24542
Model#: 551054A
Brand: Caleffi
$412.00
Free Shipping
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Free Shipping
*This product qualifies for Free Shipping anywhere in the contiguous US. Accessories may ship separately. Items over 100lbs shipped via semi-truck, be sure to select "Lift Gate" to lower the product to the ground curbside. Remote area surcharges map apply, see our full shipping policy for more details.
Factory-Direct
Caleffi FlowCal Y-Strainer with Integral Ball Valve and PT Test Ports, 1-1/4" NPT Connections
Item#: 24682
Model#: 120371A 000
Brand: Caleffi
$231.00
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Free Shipping
*This product qualifies for Free Shipping anywhere in the contiguous US. Accessories may ship separately. Items over 100lbs shipped via semi-truck, be sure to select "Lift Gate" to lower the product to the ground curbside. Remote area surcharges map apply, see our full shipping policy for more details.
Factory-Direct
Caleffi FlowCal Y-Strainer with Integral Ball Valve, 1-1/4" Sweat Connections
Item#: 24691
Model#: 120179A 000
Brand: Caleffi
$212.00
Free Shipping
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Free Shipping
*This product qualifies for Free Shipping anywhere in the contiguous US. Accessories may ship separately. Items over 100lbs shipped via semi-truck, be sure to select "Lift Gate" to lower the product to the ground curbside. Remote area surcharges map apply, see our full shipping policy for more details.
Factory-Direct
Caleffi Manifold Cabinet for up to 13 Outlets Assembly, 40" W x 20" H
Item#: 24755
Model#: 659104
Brand: Caleffi
$381.00
Free Shipping
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Free Shipping
*This product qualifies for Free Shipping anywhere in the contiguous US. Accessories may ship separately. Items over 100lbs shipped via semi-truck, be sure to select "Lift Gate" to lower the product to the ground curbside. Remote area surcharges map apply, see our full shipping policy for more details.
Factory-Direct
Caleffi Scald Protection 3-Way Thermostatic Mixing Valve, Low-Lead Brass 3/4" NPT Connections, 2 Cv
Item#: 24866
Model#: 521352A
Brand: Caleffi
$117.00
Free Lift Gate
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Free Lift Gate
*This product qualifies for Free Lift Gate Service. Items over 100lbs normally ship via semi-truck. Select this service if you need the product lowered to the ground curbside. To learn more about Lift Gate Service, read our shipping policy.
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