SKU: CF-573002A

Caleffi Backflow preventer and Autofill Combination


Caleffi Backflow preventer and Autofill Combination to fill hot water and glycol radiant floor PEX tube circuit

  • Description


    The automatic filling valve is a device consisting of a pressure-reducing valve with compensating seat, visual system pressure setting indicator, an inlet filter, anti-scale internal parts, a shut-off valve (round knob on the bottom), and a check valve.

    It is installed on the water inlet piping in sealed heating systems like radiant floor hydronic system, and its main function is to maintain the pressure of the system at a set value, automatically filling up with water as required.

    The valve is pre-adjustable, meaning it can be set to the desired pressure value before the system charging phase.

    After installation, during the filling or topping-off phase, the water feed will stop when the set pressure is reached. This valve fills 50% faster than other valves. There are no levers to flip or valves to close.

    Pre-assembled with the 573 series backflow preventer, the AutoFill™ Combo features an atmospheric vent that is designed to protect drinking water systems from return flow, caused by back-siphoning or back pressure, of contaminated fluids. The 573 series has been specifically certified to standards CSA B64.3 and ASSE 1012.


  • Videos

  • Reference documents

  • Additional information

    Weight 1 kg
    Dimensions 30 × 30 × 30 cm

We guarantee quality products.


A delivery service you can depend on.


Need assistance? Our experts are waiting for your call.