Gen 3 Tankless Unit only.

If this is a replacement for gray plastic flowmeter, you must also replace the Gen 3 wiring harness (#21065) and upgrade a board on the controller.

To make the replacement, securely package the controller in a box that includes identifying information and send it to MistAway.  We will make a modification to the hardware, upgrade the firmware, and return it to you, along with the new brass flow meter and wiring harness.