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[Jimbob]

Pull switches for both  shower and light are in the bathroom.
Shower, ill be honest, doesnt normally get turned off, it lives on standby most of the time.
Light, on and off when needed, normally on all evening.

Solution needs to be as fool proof and automated as possible, as I know it wont get used/ left on otherwise.

Really erring towards the PIR, with overrun at the moment

[Taxi_Driver]

Pull switches for both  shower and light are in the bathroom.
Shower, ill be honest, doesnt normally get turned off, it lives on standby most of the time.
Light, on and off when needed, normally on all evening.

Solution needs to be as fool proof and automated as possible, as I know it wont get used/ left on otherwise.

Really erring towards the PIR, with overrun at the moment

Ahh...ok....my idea probably wont be a good one then 

In my bathroom, it has two ceiling lights, one operates with pullcord and the other with switch outside (separate wc and bathroom, knocked into one, to create space for shower cubicle )

Extractor fan is wired into light next to the shower.....so only when this light is turned on does the extractor come on.

I was thinking that if you had a light switch out the bathroom, you could change this to a double switch and just have the extractor (with delay timer) connected to it......but you dont and also involves having to remember to turn the switch off as you leave the bathroom   

[Jimbob]

Nice plan...too much manual intervention

[Auto Addict]

Years ago I saw one that worked off a heat sensor attached to the hot water pipe :- pipe hot = fan, pipe cold = no fan.

[Shackeng]

Nah, humidistat. If you've even a half decent shower it will expose a lot of hot water to the atmosphere so obviously you'll get a lot of steam and moisture in the room. There's no way in gods green earth a fan will extract all that steam and damp by the time the person in the room dries off and turns the light off. Light on or off and nobody in the room has zero baring on the level of humidity, so it needs to run according to humidity level alone.

It will need to run for a good twenty minutes in winter with the window shut. Opening the window keeps that time down but there's always the odd occasion when somebody forgets and leaves it open. So we rely on the fan alone in winter, summer the window is ajar anyway.

Plus, as option 2) they don't come on at all when somebody wants a pee at 2 am or any other reason that does not involve steam, obviously. Who tf needs a fan on just because the lights on? Lived with one of those for years, they are a pita, and eventually get turned off at the isolator switch due to noise at night.

Humidistat do however, need slight adjustment between summer and winter. Two second job as there's a dial on the side of the unit to suit, just reach up and tweak it. Plus two adjustable pots for on and off in the unit itself but we've not needed to fiddle with those.

If the fan is for steam alone, and it realise this is Jimbob we are talking about , then Humidistat. Simples.


There's also plastic replacement roof tiles with the external vent built in. Just swap the vent tile in connect the pipe work, job done.

Blimey, how long are you in the shower? Our bathrooms are both heated, and with the extractor fan on (with the light) we get no steam left after the approx 5 min shower.

[tunnie]

In my old flat, after a shower the bathroom looked like a steam room 

Heated, but solid 1936 walls did not help 

"Temp" flat has an extractor fan, on a timer, linked to light switch. Zero steam after a shower, fan works very well.

[Radar]

I put in one of the humidistat ones from sp from tlc -direct - it works well you just need to tinker with the humidity level dial until it gets to the level you are happy with. After that it is totally automatic. Also get the biggest/most powerful one you can.

[chrisgixer]

Nah, humidistat. If you've even a half decent shower it will expose a lot of hot water to the atmosphere so obviously you'll get a lot of steam and moisture in the room. There's no way in gods green earth a fan will extract all that steam and damp by the time the person in the room dries off and turns the light off. Light on or off and nobody in the room has zero baring on the level of humidity, so it needs to run according to humidity level alone.

It will need to run for a good twenty minutes in winter with the window shut. Opening the window keeps that time down but there's always the odd occasion when somebody forgets and leaves it open. So we rely on the fan alone in winter, summer the window is ajar anyway.

Plus, as option 2) they don't come on at all when somebody wants a pee at 2 am or any other reason that does not involve steam, obviously. Who tf needs a fan on just because the lights on? Lived with one of those for years, they are a pita, and eventually get turned off at the isolator switch due to noise at night.

Humidistat do however, need slight adjustment between summer and winter. Two second job as there's a dial on the side of the unit to suit, just reach up and tweak it. Plus two adjustable pots for on and off in the unit itself but we've not needed to fiddle with those.

If the fan is for steam alone, and it realise this is Jimbob we are talking about , then Humidistat. Simples.


There's also plastic replacement roof tiles with the external vent built in. Just swap the vent tile in connect the pipe work, job done.

Blimey, how long are you in the shower? Our bathrooms are both heated, and with the extractor fan on (with the light) we get no steam left after the approx 5 min shower.

Our shower is pumped remember, and from previous posts, Jimbob has a new power shower, or was thinking along those lines anyway...?

But I really don't see what that has to do with it tbh. IMO the fan should only run when humidity/steam dictate. What has turning a light on, got to do with condensation ?

Nout!

[tunnie]

If no window or limited ventilation, remember these extractor fans also need to remove bad smells, so not always condensation. Flat I'm currently in, it's linked to light switch, turn that on and the fan comes on. (although there are isolation switches above the door)

[chrisgixer]

If no window or limited ventilation, remember these extractor fans also need to remove bad smells, so not always condensation. Flat I'm currently in, it's linked to light switch, turn that on and the fan comes on. (although there are isolation switches above the door)

Yeah, but our poo don't smell.

[tunnie]

If no window or limited ventilation, remember these extractor fans also need to remove bad smells, so not always condensation. Flat I'm currently in, it's linked to light switch, turn that on and the fan comes on. (although there are isolation switches above the door)

Yeah, but our poo don't smell.

After a tiffins i find that very unlikely! 

[Andy B]

Nice plan...too much manual intervention

Humidistat then ...... one with a pull cord too for smells! 

[chrisgixer]

If no window or limited ventilation, remember these extractor fans also need to remove bad smells, so not always condensation. Flat I'm currently in, it's linked to light switch, turn that on and the fan comes on. (although there are isolation switches above the door)

Yeah, but our poo don't smell.

After a tiffins i find that very unlikely! 

Yeah its fine otherwise.

[Jimbob]

Ok...

So anyone not happy with their humidistat fans?

And has Anyone tried a PIR one?

[Marks DTM Calib]

Have fitted a few humidistat ones and they work very well, ideal setup in reality as they run for as long as they need to.

My advice, get the quietest one you cna with as big an air volume shifting capability as you can (many of the cheapo 100mm ones are pretty rubbish).

Its also worth considering a ceiling mount version as that makes the wiringa dn ducting a lot easier (e.g. ducting and wiring is then in the loft space)