H-BOX SingleZone


Hot water circulating system for separating heating zones

The “H-BOX SingleZone” system is designed to facilitate hot water circulation in larger residential and commercial buildings where pressure control stations exist on hot water risers.

These PRV stations create a low pressure zone which prohibits circulation by the hot water plant circulation pump and therefore requires a solution to circulate the hot water downstream of the PRV station.

All components are Watermark approved.


H-BOX ‘single zone’ hot water circulating system, consisting of heat exchanger, dual circulating pumps and controller, expansion control, air release valve, and ancillary components to facilitate circulation of hot water after a pressure control valve station where separate pressure zones are created.


  • downloads
Code connection Other details
HBS-5 25mm 5kW @ 3degC temperature loss and 0.4 l/s flow rate. Left or right primary connection.
HBS-12 40mm 12kW @ 3degC temperature loss and 0.9 l/s flow rate. Left or right primary connection.
HBS-22 50mm 22kW @ 3degC temperature loss and 1.8 l/s flow rate. Left or right primary connection.

delivering unrivalled industry knowledge

Our technically trained and experienced staff have developed a long standing reputation for delivering to you unrivalled industry knowledge and support for the brands that we proudly represent. Our investment in support also extends to our state of the art showroom and training centre, providing direct opportunities for hands on, face to face training for you and your staff.