Thermostatic tap not getting hot enough

Polly05

Looking for an expert on thermostatic bath/shower mixers. Got a new bathroom with new thermostatic bath tap/shower a few months ago. But it doesn't get hot enough. I got the instructions and took the end off and tried to adjust the set temperature bit. I think I've turned it to the hottest setting but the water still doesn't get hot. I've tried increasing and decreasing the water temperature on the boiler. That doesn't help either. I've tried decreasing the amount of water coming in to the boiler by turning down the main stop !!!! a bit.. that didn't work either.
Anyone know how to fix it?
Thanks

getmore4less

when you say new did you pay someone to put it in?

Polly05

Yep. Paid a fortune for a whole new bathroom. I asked the guy afterwards and he told me to check the instructions or Google it 😕

Le_Kirk

I suggest it is because the valve is set to about 41-43 degrees and it cannot be set to produce higher temperatures because of the risk of scalding the showeree (is that a word?).

Rodders53

Le_Kirk wrote: »

I suggest it is because the valve is set to about 41-43 degrees and it cannot be set to produce higher temperatures because of the risk of scalding the showeree (is that a word?).

Thermostatic Mixer Valves for baths tend to have a max preset of 46+/-2 Celsius (44-48 C) because the maximum permitted is 48 C under the Building Regs from 2010. Most shower mixers I've checked out are similar max temp although some, e.g. Mira, have a max setting as low as 41 C. I know my bath/shower mixer has a defeatable temperature stop at 38 C which is hot enough (for me)!

OP may get some better advice if they can provide maker and model of the mixer concerned?

I'd be using a thermometer to measure the water temperatures: at kitchen HW tap, at bathroom HW tap and at bath mixer on max temp. That would perhaps allow diagnosis of what temperatures are attainable?

Norman_Castle

Does some new hot water pipework have temperature sensors in it? I remember a thread on here about a similar problem where the reduced water temperature was affecting how the thermostatic tap worked.