Name: Resideo NK300S-100UP Combination Boiler Feed Valve with Union Press Fitting Connections
Brand: Resideo
SKU: HONE-NK300S-100UP
Price: 285.04 USD
Availability: InStock

Combination Boiler Feed Valve with union press fitting connections

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Pipe Size	1/2 in.
Connection Type	Includes union press fitting 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

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-100 Combination Boiler Feed Valve with Sweat and Threaded Connections.

The NK300S-100UP is a combination boiler feed valve from Resideo (Honeywell Home), 1/2 in, union press 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-100UP
Type: Combination boiler feed valve
Pipe size: 1/2 in
Connection: Includes union press fitting 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: 085267345163
Category: Boiler Fill Valves

Full Specifications

Application	Closed-loop Heating Systems
Product Features	Conveniently located test ports for easy inspections and check out, Optimal protection of the potable water supply system, Pressure reducing valve with inlet pressure balancing - inlet pressure fluctuation does not influence the outlet pressure, Outlet pressure adjustable and directly visible on the pressure gauge, Low maintenance effort - cartridge insert and valve insert are completely replaceable, Pressure Gauge: 0-60 psi @ max temp 140°F (60°C)
Controlled Media	Drinking Water
DN Size	1/2 in
For Use With	S06K-1/4NPT Blanking Plug
Includes	Boiler fill shut off valve, Double check backflow preventer with air vent and discharge connection, Valve cartridge, Integrated 200 micron strainer, Check valve, Pressure reducing valve with valve insert, Adjustment spring
Compatible With	Residential Boilers, Light Commercial Boilers, Multi-Family Residential Boilers
Warranty	5 years
Approvals and Standards	ASSE 1081 Listed
Media Temperature (Max)	180 °F, 82 °C
Outlet Pressure (Min)	10 psi, 0.7 bar
Outlet Pressure (Max)	58 psi, 4.0 bar
Inlet Pressure (Min)	30 psi, 2.0 bar
Inlet Pressure (Max)	150 psi, 10.3 bar
Preset Outlet Pressure	Factory set 15 psi, Factory set 1 bar
Flow Rate (Max)	16 gpm @ 22 psi, 60 l/min @ 1.5 bar
Mounting Position	Horizontal pipework with discharge connection directed downwards
Color	Brass, Black, Red, White
Valve Diaphragm Material	EPDM
Valve Spring Material	Stainless Steel
Seal Material	EPDM Rubber, NBR
Filter Material	Stainless steel fine mesh
Ambient Operating Temperature (Min)	33 °F, 1 °C
Ambient Operating Temperature (Max)	140 °F, 60 °C
Filter Size	200 micron
Product Height	7.48 in, 190 mm
Product Length	7.79 in, 198 mm
Product Weight	1.8 kg, 4 lb