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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Learn More About Grundfos 91122126acw-sale-badge
Grundfos TP40-160/2 Direct Coupled In-Line Circulator, PUMP END ONLY, Bronze, GF 40/43 Flange Mount - Requires 3/4 HP, 3,450 RPM Motor
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Grundfos TP40-160/2 Direct Coupled In-Line Circulator, Pump End Only, Bronze, 3/4 HP, 3,450 RPM, GF 40/43 Flange Mount
Item#: 36534
Model#: 91122126
Brand: Grundfos
$4,253.00
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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.
Only 1 In-Stock
Grundfos TP40-160/2 Direct Coupled In-Line Circulator, PUMP END ONLY, Bronze, GF 40/43 Flange Mount - Requires 3/4 HP, 3,450 RPM Motor
Learn More About Grundfos 52722440acw-sale-badge
Grundfos UP - 1/6 HP - Single-Speed Circulation Pump - Bronze - GF 40/43 Union
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Grundfos - UP43-44BF - 1/6 Horsepower - Single-Speed Circulation Pump - Bronze - GF 40/43 Union - Hardwire - 230V/1 Phase - MPN: 52722440
Item#: 36799
Model#: 52722440
Brand: Grundfos
$683.00
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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.
Only 1 In-Stock
Grundfos UP - 1/6 HP - Single-Speed Circulation Pump - Bronze - GF 40/43 Union
Learn More About Weil-McLain 511114477acw-sale-badge
Weil-McLain 150 PSI - Low Water Cutoff
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Weil-McLain - 150 PSI - Low Water Cutoff - 511114477
Item#: 49145
Model#: 511114477
Brand: Weil-McLain
$1,510.00
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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.
Only 1 In-Stock
Weil-McLain 150 PSI - Low Water Cutoff
Learn More About Weil-McLain 510312091acw-sale-badge
Weil-McLain - Hot Water Temperature Control
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Weil-McLain - Hot Water Temperature Control - Operating Limit - Manual Reset - Low-High-Low Control - 510312091
Item#: 49670
Model#: 510312091
Brand: Weil-McLain
$456.00
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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.
Backordered
Weil-McLain - Hot Water Temperature Control
Learn More About Watts Radiant DK4000acw-sale-badge
Watts Radiant M-Series - 1-1/2" - Accessories Kit - 1-1/2" FNPT
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Watts Radiant - DK4000 - 1-1/2" Accessories Kit - 1-1/2" FNPT - Order Number: 81005370
Item#: 25525
Model#: DK4000
Brand: Watts Radiant
$618.50
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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.
Estimated Availability
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Estimated Availability
Secure your place in line to receive this item once the manufacturer has provided us new inventory. Keep in mind orders are fulfilled in the order they are received. If you wish to no longer wait on the item, you are more than welcome to cancel the order. However, please keep in mind you will lose your place in line.
2-3 Weeks
Watts Radiant M-Series - 1-1/2" - Accessories Kit - 1-1/2" FNPT
Learn More About Watts Radiant D3515925-Nacw-sale-badge
Watts Radiant M-Series - 1-1/2" - BSP Elbow
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Watts Radiant - D3515925-N - 1-1/2" BSP Elbow - Order Number: 81005365
Item#: 25529
Model#: D3515925-N
Brand: Watts Radiant
$124.50
Estimated Availability
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Estimated Availability
Secure your place in line to receive this item once the manufacturer has provided us new inventory. Keep in mind orders are fulfilled in the order they are received. If you wish to no longer wait on the item, you are more than welcome to cancel the order. However, please keep in mind you will lose your place in line.
4-6 Weeks
Watts Radiant M-Series - 1-1/2" - BSP Elbow