Pipe thermostat for fan override

[coopersim]

Is there a decent sensitive narrow temperature range pipe stat I can use to use as a switched override for a bathroom fan when the shower is turned on?

I’ve currently got the flomasta cylinder / pipe stat in place but the water temperature is too low and the measuring type on the stat not sensitive enough.

I’ve discounted flow switches as I don’t want to sacrifice flow rate on the shower.

Thanks

 

[CBW]

In short I’d say no. How is the fan currently wired?

 

[monkeysballs]

Just use a sonoff temp stat that would likely work you can get it to trigger turning the power on

 

[coopersim]

It currently has a humidity sensor inbuilt but it’s slow to react.

Would a liquid sensing pipe thermostat be any better? Drayton stat seems a bit better possibly?

 

[morqthana]

Is there a decent sensitive narrow temperature range pipe stat I can use to use as a switched override for a bathroom fan when the shower is turned on?

I've got one of these:

Works fine.

I’ve currently got the flomasta cylinder / pipe stat in place but the water temperature is too low and the measuring type on the stat not sensitive enough.

They go down to a 20° setting - surely your hot water is hotter than that...

 

[CBW]

It currently has a humidity sensor inbuilt but it’s slow to react.

Would a liquid sensing pipe thermostat be any better? Drayton stat seems a bit better possibly?

What about a flow sensor?

 

[Harry Bloomfield]

If a normal pipe stat isn't reacting adequatly, then you need an electronic solution.

 

[foxhole]

Fan should run whenever bathroom is occupied not just for showers .

 

[morqthana]

Fan should run whenever bathroom is occupied not just for showers .

Why?

 

[Madrab]

What's wrong with a wall switch? Turn on when needed, turn off when not needed with a suitable over-run? I think the approach is a little over engineered TBH but if that's what you want.

A bathroom extractor should run when the shower's on but keep running to evacuate all the moisture laden air once the shower's turned off. That takes a reasonable amount of time once the shower's shut down, unless it's an industrial sized fan. That should also be used in conjunction with an open door and ideally an open window (if there is one) to create through room circulation, drawing dry air in and through.

 

[foxhole]

Why?

Removes smells and mould spores which cause mould in poorly ventilated rooms.

 

[coopersim]

Thanks all, the fan does run all the time in passive mode, I want an immediate purge when the shower is on as the ceiling is low and the room relatively small

 

[morqthana]

So which pipe have you got the stat on which doesn't even get to 20° when the shower is running?

 

[coopersim]

The pipe to the shower head. The issue is the cheap pipe stat I think

 

[dilalio]

I'd put it on a pir in the ceiling or wall... Looks much neater and detects occupancy. What does it matter if it comes on just if someone enters to wash hands?