Paging Pigletjohn, who is right, plumber A or plumber B?

[CindyMaeLouise]

I had a new shower fitted with a concealed valve. Two tap heads are on show, one controls the volume of flow and the other controls the temperature. If we're in the shower & it feels too hot, we turn it cooler but it gets even hotter still, till we have to jump out or get burnt.

Plumber A says the hot & cold pipes in the wall have been connected to the valve the wrong way round.

Plumber B says this makes no difference as the valve is thermostatic so even if the pipes are connected back to front, it would regulate the temperature as it's supposed to.

I don't understand but we're left with a shower we can't use for fear of getting burnt. Can you advise please?

You need to tag him/her @pigletjohn, hope this works

A is right

B is a numbskull

you can take the mixer off the wall and put it back upside down; or cross the pipes over in some convenient place

I hope it has not been tiled in.

Numbskull

Sadly the whole thing is tiled in now....

Many thanks Piglet!

Was it a local company or something like B&Q / Wickes? As the latter I'd be claiming under their guarantee and getting them to cover the cost of retiling.

the thermostatic control says "if water is too hot, open right hand pipe and close left-hand pipe a bit"

because right hand pipe is supposed to be cold

if right hand pipe is (incorrectly) hot, it will open the right hand (hot) pipe and make it hotter.

the fault is not in the mixer, it is the fault of the plumber who put the pipes in wrong (or fitted the mixer upside down, this is a mistake that has the effect of swapping left and right)

Post a pic.

Some mixers can be turned over.

If we're in the shower & it feels too hot, we turn it cooler but it gets even hotter still, till we have to jump out or get burnt.

If the pipes are swapped, what happens if you turn it hotter when it feels too hot? Might that not add cold water?

Just until you get someone to sort it properly.

We had same problem.
We had to get plumber to swap piping over near hot water tank so now we've got a tidy bank of pipes with an X crossed pipes in the middle

@FinallyHere

If we're in the shower & it feels too hot, we turn it cooler but it gets even hotter still, till we have to jump out or get burnt.

If the pipes are swapped, what happens if you turn it hotter when it feels too hot? Might that not add cold water?

Just until you get someone to sort it properly.

I was thinking exactly the same. If pressing cold, makes it hotter, then pressing hot, will make it cooler. Or maybe you and I are numbskulls too. 😂

@CindyMaeLouise

Numbskull

Sadly the whole thing is tiled in now....

Many thanks Piglet!

see also

here

Or maybe you and I are numbskulls too.

@moonbedazzled I wouldn't want to put any money on it, either way. 😀