I Had a low voltage One just like yours, but the actual fan was in the loft, same thing just away from my shower so you don't get an electric shock, this was then connected to the shower vent with ducting, same type as a tumble drier, I bought a big black fan from
screwfix, its sucking power on paper was triple so I gave it a go, stuck it in the loft stuck the power cable in it stuck the pipes on and done, much better, when I showered before room would fill with steam and condense on taps etc, now room.stays steam free for 5mins then the mirror slowly starts to steam up, also when shower is finished, its steam free by the time I scrape the shower glass and dry
But if you don't have a loft you will have to find another method, visit the vent Axia swebsiteand see if there's a fan for your situation but upgraded power
R
Humidity in your house needs to be controlled, the main reason for these fans is to remove the excess moisture the shower creates, it will not stop the cause of humidity in other areas of your home, but it can be used with the bathroom door open to suck air through your house and remove that humidity as well, if you search ebay for hygrometer, cheapest first there's a little solar powered hygrometer for three quid, it will tell you temperature andrrelative humidity, use it outside then use it in rooms in your house, then you will start to understand how much moisture you create in various parts of your home, if your houseis well sealed with no draughts around windows and doors etc then it can be hard for the moisture you create to leave the home, this moisture will float around your house on air movements and hot air from your radiators until it finds cold taps and toilet tanks and windows to condense on, then this cycle repeats every day every month and you only notice when mould starts growing on the damp parts,
I know it sounds like science fiction, but buy a hygrometer and you will.see, or at least be able to build a picture of what is going on, if left uncontrolled this moist humid air can find its way up into your attic and condense there causing droplets to form and drip.on your ceiling giving the impression you have damp or a leak , or it can condense on lower parts of cold walls and build up for weeks and weeks giving the impression its rising damp, oh and all this humidity comes from us, breathing, cooking showering ,drying clothes or tea towels on radiators, it all evaporates and goes.into the household air, any thing I can help with just aask, if you need advice with the fan I'm an electrician