Wickes Shower Pump - Electrical Question

Why not just control the fan from a humidistat?

out. (But I'd still be interested if anyone can shed some light on the shower pump circuitry).

Surely the supply to the pump is only live when the pump is running - can't you just connect there?

Ben.

Fit a shower light/extractor fan over the shower with a fan override. Available from B&Q, Wickes etc. When you have a shower the light is on. Can be operated via pull chord or on the main bathroom light switch.

Install a flow switch in the water pipe from the pump then. Use it with a fan designed to be controlled via a light switch that has an overrun timer. Better still "wire or" it with the humidistat. So the pump turning on starts the fan, the humidistat keeps it going long enough after to dry the room.

I did a ducted fan combined with a shower light, that worked on a remote humidistat. Worked nicely. Gave you a light over the shower, steam extraction from the source, low noise, and automated operation that controlled the humidity.

The supply to these pumps is usually permanent, operation being controlled from an internal flow switch.

Personally I would steer away from doing anything that required internal tinkering with the pump, since you will potentially have problems should you ever have to replace it later; especially if with a different model or version.

You'd need to find the output side of the flow switch. However, tampering with this wiring would rightfully void the warranty - the switch might well not have any spare capacity for extra load. Also if I really wanted to do this and wasn't concerned about the warrenty I'd use a relay or even a second flow sensor.

Thanks to everyone for their suggestions. I'll have a rethink about how to go about this.

If you really want this idea fit a flow switch in the hot water supply to the shower. About £25 from Farnell.