DIGITEN FS-C02 G3/4" BSP Male Thread Water Flow Switch 0-2A/ 0-220V(AC or DC) for Shower Flow Water Heater

working great, it turns on the relay that powers my hot water on demand 220 volt water heater unit.

Installed easy on cold water line feeding a loop to all hot water faucets. Grundfos pump comes on when any faucet is open . Pump draws .58amps====== part #2 came very fast I raised to 3 stars put in the new one and works great now. Took 2photos and pump runs when cold water runs through it. Ok got the new #2 one installed and it failed in 1hour removing 2 stars.

My flow switch stays made under normal water pressure, even if there is no flow. No water pressure and no water movement, then it might revert back to an open state but a lot of times not.

This product is used on my tank-less water heater to activate the re-circulation pump. I just momentary turn on than off any faucet in my house for a second and the flow switch activates the re-circulation pump. This is needed to be in compliance with title 24 of CA code. A re-circulation pump is not allowed to be on a timer or on full time. Instead the code requires an activation button located near each faucets. This works better as you don't needed multiple buttons! There is a plastic flow switch but its max flow rate is below the 11gpm of my tank-less. This has a higher flow rate. Note: This flow switch has BSP threads you will need to use BSP to NPT adapters.

I installed this on the cold water supply of my hot water heater to activate my hot water circulation pump. This reduces the amount of water I waste getting hot water to the other side of the house. I am using a RaspPI to activate a solid-state relay for a fixed amount of time once flow is detected.Pros: This is a solid brass construction and there is no barrier penetration between the water and the switch. There is a magnet inside the fitting to detect flow and the magnetic sensor does not have direct contact with water. It requires a flow of about ~1GPM to activate.Cons: The thread IS NOT 3/4" NPT-Male. It is a Metric BSPT 3/4" Male thread. It is straight mechanical thus requiring a hose washer. I had to purchase a brass adapter to convert from BSPT to NPT and that fitting cost as much as this sensor.This manufacturer should offer this product threaded in both NPT and BSPT.

Very low flow restriction with this switch! Mounted horizontally with no issues. Switch closes when water is flowing and opens when the flow stops. As advertised, it uses G3/4" connections which are not tapered, so it requires a vinyl washer (same size as a garden hose) on each female connection to make a seal. I used G3/4" - 3/4" NPT adapters (available elsewhere on Amazon) and several garden hose washers and the setup is leak free.

This thing is supposed to be able to switch 120 VAC at no more than 2 amps but I connected 120 VAC and the first time I switched in my .5A load it apparently welded itself because now it is always closed (on).Additionally the thing restricts flow like crazy.Avoid this thing, spend a little more and get something that will do the job and last. I spent days replumbing and part of it was puting this in place, now I need to rip it out and find a replacement that can fit in its place.

Used for control of water pump through a relay to carry the starting amps. It doesnt sense the water flow perfectly every time . Somtimes there is a slight lag. However there are many other unknown factors in this type of water pressure booster system which may be the cause. Pity it couldnt handle 4 or 5 amps directly>