Boiler Fill & Makeup Water Valves

Boiler fill valves are used to provide a supply of fresh water for a hot water boiler system - whether newly installed or recently drained/flushed. Their main purpose is to reduce the incoming water pressure to a desired level and prevent back-flow of system water (since it can contain sludge, rust inhibitors and other chemicals) into the potable water supply.
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1/2" FNPT x 1/2" FNPT Union Pressure Reducing Boiler Fill Valve Taco
1/2" FNPT x 1/2" FNPT Union Pressure Reducing Boiler Fill Valve
Part#: 329-T3 Brand: Taco
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(6)
$69.95 / each
$271.80 box of 4 + Free Shipping
($67.95 each)
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1/2" Threaded Pressure Reducing Valve, Cartridge Style, 10-50 psi Taco
1/2" Threaded Pressure Reducing Valve, Cartridge Style, 10-50 psi
Part#: 3350-T3 Brand: Taco
In Stock
(3)
$69.95 / each
$271.80 box of 4 + Free Shipping
($67.95 each)
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B1156F, 1/2" High Capacity Boiler Fill Valve, FNPT x FNPT Watts
B1156F, 1/2" High Capacity Boiler Fill Valve, FNPT x FNPT
Part#: 0386423 Brand: Watts
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$104.70 / each
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SB1156F, 1/2" High Capacity Boiler Fill Valve, FNPT x Sweat Union Watts
SB1156F, 1/2" High Capacity Boiler Fill Valve, FNPT x Sweat Union
Part#: 0386422 Brand: Watts
In Stock
(1)
$119.28 / each
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TB1156F, 1/2" High Capacity Boiler Fill Valve, FNPT x FNPT Union Watts
TB1156F, 1/2" High Capacity Boiler Fill Valve, FNPT x FNPT Union
Part#: 0386421 Brand: Watts
In Stock
(1)
$119.28 / each
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1/2" FNPT x 1/2" FNPT Union Pressure Reducing Boiler Fill Valve with Pressure Relief Valve Taco
1/2" FNPT x 1/2" FNPT Union Pressure Reducing Boiler Fill Valve with Pressure Relief Valve
Part#: 334-T3 Brand: Taco
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(3)
$105.95 / each
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1/2" FNPT x 1/2" Union FNPT Combination Boiler Feed Valve (Pressure Reducing w/ Pressure Relief) & Backflow Preventer Taco
1/2" FNPT x 1/2" Union FNPT Combination Boiler Feed Valve (Pressure Reducing w/ Pressure Relief) & Backflow Preventer
Part#: 3450-T2 Brand: Taco
Temporary Out of Stock
$109.95 / each
$419.80 box of 4
($104.95 each)
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1/2" Threaded x Sweat Union Boiler Fill & Backflow Preventer Valve Combination Taco
1/2" Threaded x Sweat Union Boiler Fill & Backflow Preventer Valve Combination
Part#: 3492-050-BC1 Brand: Taco
In Stock
(3)
$112.95 / each
$435.80 box of 4
($108.95 each)
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1/2" Threaded x Union Boiler Fill & Backflow Preventer Valve Combination Taco
1/2" Threaded x Union Boiler Fill & Backflow Preventer Valve Combination
Part#: 3492-050-BT1 Brand: Taco
In Stock
(1)
$112.95 / each
$435.80 box of 4
($108.95 each)
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B911-M3, 1/2" Boiler Fill (1156) & Backflow Preventer (9D) Valve Combination, FNPT x FNPT Union Watts
B911-M3, 1/2" Boiler Fill (1156) & Backflow Preventer (9D) Valve Combination, FNPT x FNPT Union
Part#: 0386463 Brand: Watts
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$214.41 / each
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B911S-M3, 1/2" Boiler Fill (1156) & Backflow Preventer (9D) Valve Combination, FNPT x Sweat Union Watts
B911S-M3, 1/2" Boiler Fill (1156) & Backflow Preventer (9D) Valve Combination, FNPT x Sweat Union
Part#: 0386462 Brand: Watts
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$175.62 / each
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1/2" FNPT Union Dual Check Backflow Preventer Valve w/ Atmospheric Vent (Lead-Free) Matco-Norca
1/2" FNPT Union Dual Check Backflow Preventer Valve w/ Atmospheric Vent (Lead-Free)
Part#: BFP-90-12LF Brand: Matco-Norca
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(4)
$43.55 / each
$165.40 box of 4 + Free Shipping
($41.35 each)
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1/2" Union Sweat Dual Check Backflow Preventer Valve w/ Atmospheric Vent (Lead-Free) Matco-Norca
1/2" Union Sweat Dual Check Backflow Preventer Valve w/ Atmospheric Vent (Lead-Free)
Part#: BFP-90-12CLF Brand: Matco-Norca
In Stock
(4)
$43.55 / each
$165.40 box of 4 + Free Shipping
($41.35 each)
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3/4" FNPT Union Dual Check Backflow Preventer Valve w/ Atmospheric Vent (Lead-Free) Matco-Norca
3/4" FNPT Union Dual Check Backflow Preventer Valve w/ Atmospheric Vent (Lead-Free)
Part#: BFP-90-34LF Brand: Matco-Norca
In Stock
(4)
$43.55 / each
$165.40 box of 4 + Free Shipping
($41.35 each)
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BBFP, 1/2" Dual Check Backflow Preventer Valve w/ Atmospheric Vent, FNPT Union x FNPT Union Watts
BBFP, 1/2" Dual Check Backflow Preventer Valve w/ Atmospheric Vent, FNPT Union x FNPT Union
Part#: 0063190 Brand: Watts
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$112.84 / each
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BBFP, 3/4" Dual Check Backflow Preventer Valve w/ Atmospheric Vent, FNPT Union x FNPT Union Watts
BBFP, 3/4" Dual Check Backflow Preventer Valve w/ Atmospheric Vent, FNPT Union x FNPT Union
Part#: 0063192 Brand: Watts
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$121.01 / each
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BBFP-S, 1/2" Dual Check Backflow Preventer Valve w/ Atmospheric Vent, Sweat Union x FNPT Union Watts
BBFP-S, 1/2" Dual Check Backflow Preventer Valve w/ Atmospheric Vent, Sweat Union x FNPT Union
Part#: 0063191 Brand: Watts
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$112.84 / each
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9D-M3, 1/2" Dual Check Backflow Preventer Valve w/ Atmospheric Vent, FNPT Union x FNPT Union Watts
9D-M3, 1/2" Dual Check Backflow Preventer Valve w/ Atmospheric Vent, FNPT Union x FNPT Union
Part#: 0061935 Brand: Watts
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$126.16 / each
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9D-M2, 3/4" Dual Check Backflow Preventer Valve w/ Atmospheric Vent, FNPT Union x FNPT Union Watts
9D-M2, 3/4" Dual Check Backflow Preventer Valve w/ Atmospheric Vent, FNPT Union x FNPT Union
Part#: 0061888 Brand: Watts
In Stock
$135.14 / each
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About Boiler Feed Valves

"Fill" or "feed" valves, as the name suggests, are intended for supplying the boiler and the heating system with water. While fill/feed valve generally implies only the pressure regulating valve, the make-up water package nearly always include a backflow preventer, which stops the system water from going back into the drinking water supply. These two, often sold as a factory-assembled combo are very common for new boilers installs.

Most boiler fill valves are similar in design and specs (but could use different quality of materials - hence the price difference), and have a 10-25 psi adjustable outlet pressure, often factory set to 12 or 15 psi. They are simply pressure reducing valves designed for boiler feeding applications. Some models may utilize a built-in check valve.
Dual check backflow preventers with atmospheric vent are devices intended to prevent the reverse flow of boiler system water into the potable supply. How it works - under normal operating conditions, supply/inlet pressure keeps the vent closed, but in the event of zero supply pressure or backsiphon, the vent is opened, allowing contaminated water to drain through the vent.
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