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The GMP4’s primary function is to automatically supply pressurized water or a water/glycol mixture to a closed-loop space heating, chilled water, snowmelt, solar, radiant heating or process control system, to ensure that minimum system pressure levels are maintained. It features a 15 L (4 gal.) tank perfectly suited for mid-sized residential applications, and can be used for installations holding up to 300 L (79 gal.). Among its outstanding features are its rectangular design and compactness, meaning it occupies less space in occasionally cramped mechanical rooms. As well, it comes with its own wall-mount rack so the installer simply hangs the device at no further expense. The GMP4 is also equipped with an alarm floater so that users can hook up a sound alarm and be notified when liquid levels fall too low, a potential sign of leakage.



  • Compact
  • Panel ready with included wall mounting support
  • Integrated terminal for a quick & easy audible alarm addition if needed Plus all the benefits of using a GMP
    • No direct connection to potable water
    • Prevents major floods
    • Provide leak detection
    • Level float switch


Capacity L (gal) Electrical Pump Discharge connection Pressure
15 L (4 gal) 24V AC/DC 1 GPM (3.8 L/m) 1/2” FPT 0-35 PSI (0-241 kPa)


Hydronic Radiant Floor Heating & Snow Melting