Hot water goes cold

[VerityP]

The water in our bathroom upstairs runs hot for up to a minute then goes luke warm. We have had two plumbers look at this so far. One said it was the mixer on the hot water tank but when replacing it didn't work, he said it was the hot water tank that had furred up and it needed replacing. Quoted £3000 to replace the system - we sought a 2nd opinion. The second plumber thought it was the mixer valve on the shower. This has been replaced but it hasn't fixed it. The boiler is a conventional boiler, the heating works fine and the hot water works fine downstairs. Also, I understand that when the hot water is turned off at the tank, the hot water taps still run. Any advice would be welcome. We are now £600 poorer but the problem is not diagnosed or fixed.

 

[ShaunCorbs]

does it run hot in your other outlets ?

 

[VerityP]

Yes. We only have the bathroom upstairs and then outlets in the kitchen and utility downstairs. All of the downstairs ones work fine.

 

[ShaunCorbs]

right in the bathroom what outlets run hot the cold ?

bath/ shower
basin etc?

 

[VerityP]

All three, the basin, the bath and the shower

 

[ShaunCorbs]

does it change if you open one outlet 1/2 open / less?

and would you know if you have a blending valve on the bathroom?

 

[Old Account]

I would have called them back if I were you. How does this work leaving a customer without solving the problem and getting paid? If the second plumber changed the mixer you must have checked it if it works or not

 

[VerityP]

the answer to both those questions is, I don't know. I know there's a blending valve on the hot water tank because that's what plumber number one tried. I'll just go and try turning on a tap with the shower...

 

[ShaunCorbs]

the answer to both those questions is, I don't know. I know there's a blending valve on the hot water tank because that's what plumber number one tried. I'll just go and try turning on a tap with the shower...

just do one please

 

[REDSAW]

blending valve, plumber or diy?

 

[townfanjon]

Can you post a pic of 'the tank '

 

[VerityP]

I turned on various tap / shower combinations! It didn't make any difference to the temperature of the water - the shower lost a bit of pressure - that was the only effect.

 

[VerityP]

Plumber

 

[VerityP]

View attachment 24620
Not the best picture in the world but it's 11pm and its in my sons bedroom!

 

[ShaunCorbs]

 

[REDSAW]

put the light on...

 

[VerityP]

Will repost tomorrow in daylight....