The optional flow sensor is installed on the cold water supply line before cold water reaches tankless water heater. This is a 3/4" flow sensor with male garden hose thread on both ends. Installer shall provide the proper adapter for each specific installation site. Never overtighten to avoid any damage to the flow sensor.
- It is strongly recommended that the flow sensor be installed horizontally if there is sufficient space from the cold water supply line protrusion to tankless water heater. Should space become an issue, this flow sensor can also be installed vertically. However, with a vertical installation, there had been a few cases of flow sensing failure due to low water pressure. Though these cases were very minimal, but please ensure there is adequate water pressure before installation.
- The flat part of the flow sensor with the four (4) screws should be on the top towards the ceiling.
- The flow sensor clearly labels the correct direction of flow with an arrow. Ensure this arrow is pointing towards the tankless water heater.