Resideo NK300S-100 Combination Boiler Feed Valve with Sweat and Threaded Connections

Item #: HONE-NK300S-100
Mfr. part #: NK300S-100
UPC: 085267561389

Key specifications

Pipe Size1/2 in.
Body materialBrass
Valve TypeFast Fill
Fluid TemperatureMaximum 180 F
Ambient Temperatur33 F to 140 F

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$261.30

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Shipping details

Shipping weight: 4.2 lb
Box size: 8.85 × 8.75 × 5.2 in

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Brand	Resideo
Manufacturer part #	NK300S-100
Pipe Size	1/2 in.
Connection Type	Includes sweat and threaded connections
Valve Type	Fast Fill
Close-off Pressure	14.5 psi minimum (inlet to outlet)
Fluid Temperature	Maximum 180 F
Ambient Temperature	33 F to 140 F
Controlled Fluid	Water
Materials (Body)	Brass
Application	Combination (re)filling valve that contains an integrated pressure reducing valve
Includes	Boiler fill shut off valve, double check backflow preventer with air vent and discharge connection, valve cartridge, integrated 200 micron strainer, a check valve, pressure reducing valve with valve insert, adjustment spring, and pressure gauge
Maximum Safe Operating Pressure (psi)	150 psi
Weight (lb)	4 lb
Weight (kg)	1.8 kg
Approvals, Others	ASSE 1081
Pressure Range (psi)	10 to 58 psi
Minimum flow rate (gpm)	16 gpm @ 22 psi pressure fall-off
Minimum flow rate (lpm)	60 l/min @ 1.5 bar pressure fall-off
Materials (Diaphragm)	Fiber-reinforced EPDM
Materials (Interior parts)	Stainless steel fine filter mesh filter
Outlet Pressure Adjustment Range (psi)	Factory set at 15 psi (1 bar)
Max. Inlet Pressure Rating (psi)	150 psi (10.3 bar)
Approvals, ASSE	1081 Listed
UPC	085267561389

Which version do I need? We also carry a similar model with a different specification. Compare size, connection, length and the other details before ordering, and contact us if you need help choosing. See also: Resideo NK300S-100UP Combination Boiler Feed Valve with Union Press Fitting Connections.

The NK300S-100 is a combination boiler feed valve from Resideo (Honeywell Home), 1/2 in, sweat and threaded connections.

Filling a boiler needs four things in the same line: a shutoff, a backflow preventer so system water can never reach the potable supply, a pressure reducing valve so the fill stops at system pressure instead of at street pressure, and a strainer. A combination valve is all of it in one body, which is fewer joints to make and fewer joints to leak.

The backflow preventer is the part that is not optional. Boiler water is treated water sitting against steel; the code separation between it and the drinking supply is the whole reason this assembly exists in this form.

Fast fill means it can be opened wide to charge a dry system quickly and then returned to regulating, instead of taking an afternoon to fill through a reducing valve at its setpoint.

What is in the body: boiler fill shut off valve, double check backflow preventer with air vent and discharge connection, valve cartridge, integrated 200 micron strainer, a check valve, pressure reducing valve with valve insert, adjustment spring, and pressure gauge.

Brand: Resideo (Honeywell Home)
Manufacturer Part #: NK300S-100
Type: Combination boiler feed valve
Pipe size: 1/2 in
Connection: Includes sweat and threaded connections
Valve type: Fast Fill
Close-off pressure: 14.5 psi minimum (inlet to outlet)
Maximum fluid temperature: 180 F
Body material: Brass
Maximum pressure: 150 psi
Includes: Boiler fill shut off valve, double check backflow preventer with air vent and discharge connection, valve cartridge, integrated 200 micron strainer, a check valve, pressure reducing valve with valve insert, adjustment spring, and pressure gauge
UPC: 085267561389
Shipping weight: 3.96 lb
Category: Boiler Fill Valves