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One of the biggest names in hydronics, Caleffi has all the parts to optimize your boiler's performance. We carry a full line of Caleffi heating products, so start shopping below or call us for expert advice!
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Model Number 940451 is the Number 1 Seller
Learn More About Caleffi 940451
Caleffi Series 940 - Radiator Adapter - 1/2" x 3/4" Connections - QTY: 2
Model: 940451

Caleffi - Series 940 - Radiator Adapter - 1/2" M Straight x 3/4" M Conical Connection, Package of 2

15% Buy This
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(3)
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$9.65
Only 4 In-Stock
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Model Number 200000 is the Number 2 Seller
Learn More About Caleffi 200000
Caleffi Thermostatic Control Head with Built-in Sensor, 45-82 F Temperature Range, used with radiator valves
Model: 200000
Caleffi Thermostatic Control Head with Built-in Sensor, 45-82 F Temperature Range, used with radiator valves
9% Buy This
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(2)
Q&A (2)
$31.25
In-Stock
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Model Number 680505A is the Number 3 Seller
Learn More About Caleffi 680505A
Caleffi 3/4" Nominal Universal PEX Fittings, ASTM Pipe Size
Model: 680505A
Caleffi 3/4" Nominal Universal PEX Fittings, ASTM Pipe Size
8% Buy This
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$4.90
Was 
$9.90
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Model Number 680504A is the Number 4 Seller
Learn More About Caleffi 680504A
Caleffi 1/2" Nominal Universal PEX Fittings, ASTM Pipe Size
Model: 680504A
Caleffi 1/2" Nominal Universal PEX Fittings, ASTM Pipe Size
7% Buy This
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$4.95
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$9.95
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Model Number 681524 is the Number 5 Seller
Learn More About Caleffi 681524
Caleffi Series 681 Universal PEX Fitting, 1/2" Nominal PEX Connection, 150 psi max - QTY:2
Model: 681524
Caleffi Series 681 Universal PEX Fitting, 1/2" Nominal PEX Connection, 150 psi max - QTY:1
7% Buy This
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(1)
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$11.10
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Learn More About Caleffi 573002A
Caleffi Auto Fill Combo Automatic Boiler Fill Valve with Backflow Preventer, 1/2" FNPT Inlet x 1/2" FNPT Outlet
Model: 573002A
Caleffi AutoFIll Combo Automatic Boiler Fill Valve with Backflow Preventer, Pressure Indicator, 1/2" FNPT Inlet x 1/2" NPT Female Outlet
6% Buy This
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(1)
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$99.60
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Learn More About Caleffi NA10313
Caleffi Series NA103 - Connection Fitting - 1/2" NPT Male Connection
Model: NA10313

Caleffi - Series NA103 - Connection Fitting - 1/2" NPT Male Connection - 150 PSI Maximum Pressure

5% Buy This
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(1)
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$6.20
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Learn More About Caleffi 546306A
Caleffi DirtMag Dirt Separator with Magnet, 1" NPT Female Connections, top thread on top
Model: 546306A
Caleffi DirtMag Dirt Separator with Magnet, 1" NPT Female Connections, top thread on top
4% Buy This
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(1)
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$116.10
Only 4 In-Stock
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Learn More About Caleffi 502710A
Caleffi Automatic Air Vent with Service Check Valve, 1/8" NPT Male
Model: 502710A
Caleffi Automatic Air Vent with Service Check Valve, 1/8" NPT Male
4% Buy This
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$9.25
Only 1 In-Stock
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Learn More About Caleffi NA10262
Caleffi 1/2" Sweat Connection Fitting, chrome plated nut
Model: NA10262

Caleffi 1/2" Sweat Connection Fitting, chrome plated nut

3% Buy This
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(1)
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$5.85
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Learn More About Caleffi 301040
Caleffi Two-pipe Straight Panel Radiators Valve, 1/2" Straight (Radiator) x 3/4" Conical (Pipe)
Model: 301040
Caleffi Two-pipe Straight Panel Radiators Valve, 1/2" Straight (Radiator) x 3/4" Conical (Pipe)
2% Buy This
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(2)
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$23.25
In-Stock
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Learn More About Caleffi 301140
Caleffi Two-pipe Angled Panel Radiators Valve, 1/2" Straight (Radiator) x 3/4" Conical (Pipe)
Model: 301140
Caleffi Two-pipe Angled Panel Radiators Valve, 1/2" Straight (Radiator) x 3/4" Conical (Pipe)
2% Buy This
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(1)
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$23.25
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Learn More About Caleffi 437516
Caleffi 1/2" Hard Copper Compression Fittings, 1/2" Compression Connections, 150 psi max QTY: 2
Model: 437516
Caleffi 1/2" Hard Copper Compression Fittings, 1/2" Compression Connections, 150 psi max
2% Buy This
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$9.35
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Learn More About Caleffi 301241
Caleffi One-pipe Straight Panel Radiators Valve, 1/2" Straight (Radiator) x 3/4" Conical (Pipe)
Model: 301241
Caleffi One-pipe Straight Panel Radiators Valve, 1/2" Straight (Radiator) x 3/4" Conical (Pipe)
2% Buy This
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(2)
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$43.95
In-Stock
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Learn More About Caleffi Z121000
Caleffi Z-One 24V Normally Closed Valve Actuator without AUX Switch, 18" Wire
Model: Z121000
Caleffi Z-One 24V Normally Closed Valve Actuator without AUX Switch, 18" Wire
1% Buy This
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$48.40
Factory-Direct
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Learn More About Caleffi 551007AC
Caleffi Discal Air Separator with 1/2" Check Valve, 1-1/4" NPT Female Connections
Model: 551007AC
Caleffi Discal Air Separator with 1/2" Check Valve, 1-1/4" NPT Female Connections
1% Buy This
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$154.40
Only 1 In-Stock
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Learn More About Caleffi 682540A
Caleffi Series 682 Universal PEX-AL-PEX Fittings, 1/2" PEX-AL-PEX Connections, 150 psi max
Model: 682540A
Caleffi Series 682 Universal PEX-AL-PEX Fittings, 1/2" PEX-AL-PEX Connections, 150 psi max
1% Buy This
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$4.95
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Learn More About Caleffi 680555A
Caleffi 5/8" Nominal Universal PEX Fittings, ASTM Pipe Size
Model: 680555A
Caleffi 5/8" Nominal Universal PEX Fittings, ASTM Pipe Size
1% Buy This
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$5.10
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Learn More About Caleffi Z111000
Caleffi Z-One 24V Normally Closed Valve Actuator with AUX Switch, 18" Wire
Model: Z111000
Caleffi Z-One 24V Normally Closed Valve Actuator with AUX Switch, 18" Wire
1% Buy This
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$52.20
Only 2 In-Stock
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Learn More About Caleffi 343452
Caleffi Straight Isolation & Balancing Valve, 1/2" Straight (Radiator) x 3/4" Conical (Pipe), 2.5 Cv
Model: 343452
Caleffi Straight Isolation & Balancing Valve, 1/2" Straight (Radiator) x 3/4" Conical (Pipe), 2.5 Cv
1% Buy This
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$22.30
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Learn More About Caleffi 551006A
Caleffi Discal Air Separator with 1/2" FNPT Bottom Thread, 1" NPT Female Connections
Model: 551006A
Caleffi Discal Air Separator with 1/2" FNPT Bottom Thread, 1" NPT Female Connections
1% Buy This
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$103.30
Only 2 In-Stock
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Learn More About Caleffi 644269A
Caleffi 2-Way Straight Motorized Ball Zone Valve, 1" Sweat Connections, 13 Cv
Model: 644269A
Caleffi 2-Way Straight Motorized Ball Zone Valve, 1" Sweat Connections, 13 Cv
1% Buy This
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$177.50
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Learn More About Caleffi 538202 FD
Caleffi Replacement Boiler Drain Valve, 1/4" NPT x 3/4" Garden Hose Thread
Model: 538202 FD
Caleffi Replacement Boiler Drain Valve, 1/4" NPT x 3/4" Garden Hose Thread
1% Buy This
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$7.85
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$12.85
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Learn More About Caleffi 546328A
Caleffi DirtMag Dirt Separator with Magnet, 1" Sweat Connections, top thread on top
Model: 546328A
Caleffi DirtMag Dirt Separator with Magnet, 1" Sweat Connections, top thread on top
1% Buy This
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$110.55
Only 2 In-Stock
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