Compatibility and installation

The flow sensor installation must be performed by a certified professional in accordance with applicable local and national building codes.

The flow sensor is designed to be installed only with NPT valves, and not with PEX valves. It is not compatible with first-generation valves VA4200WZ / VA4201WZ.

*To ensure proper operation and product durability, the device must come into contact only with treated water free of impurities.

Technical specifications
Dimensions FS4220:
  • Length: 60 mm (2.36 in)
  • Sensor diameter: ¾ in NPT x ¾ in NPT
Dimensions FS4221:
  • Length: 66 mm (2.60 in)
  • Sensor diameter: 1 in NPT x 1 in NPT
Material:
  • 304 stainless steel, lead-free
Hydraulic pressure resistance:
  • 1.75 MPa (244 PSI)
Certifications and warranty

Complies with ANSI B120.1 standard
Complies with NSF/ANSI 61 standard

Limited 3-year warranty

Included in the Box
  • 1 flow sensor FS4220 or FS4221
  • Installation guide – French version
  • Installation guide – English version

Heads up!

We noticed your cart contains both Zigbee and Wi-Fi devices. These two technologies work differently and are not directly compatible.

  • Wi-Fi devices connect to your home router.
  • Zigbee devices require a Zigbee hub or compatible gateway.

Are you sure this is the setup you want?

I understand

How about a rebate on your next purchase of thermostats offered by your power utility?