Honeywell Boiler Feed Combination including Sweat and NPT connections
Honeywell Boiler Feed Combination including Sweat and NPT connections
Item # NK300S-100

The Honeywell NK300S Boiler Feed Combination serves as a boiler fill valve used in closed loop heating systems. The NK300S is a (re)filling combination valve that contains an integrated pressure reducing valve, strainer, double check backflow preventer with air vent (to protect potable water supply against back flow of heating water into supply pipe), two shut-off ball valves, pressure gauge, and conveniently located test ports for easy inspections and check out.

Features and Benefits
  • 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
Product Specifications
Pipe Size (inch/DN) 1/2" /DN15
Connection Type Includes Sweat and NPT connections
Valve Type Fast Fill
Ambient Temperature Range 33° F to 140° F 
Fluid Temperature 180° F Maximum
Materials Brass (body), Fiber-reinforced EPDM (Diaphragm), Stainless steel fine filter mesh filter(Interior parts)
Outlet Pressure Adjustment Range (psi) Factory set at 15 psi (1 bar)
Maximum Safe Operating Pressure 150 psi (1034kPa)
Max. Inlet Pressure Rating (psi) 150 psi (10.3 bar)
Minimum flow rate (gpm) 16 gpm @ 22 psi pressure fall-off
Approvals ASSE 1081 Listed


5418 Elmwood Ave | Indianapolis IN 46203 | 888-652-9663