Water to Shower Supplied by Pump Starts Hot then Quickly Cools All aspects of plumbing questions and answers, help, tips and information

[DIYHelp]

Hi, The water in my shower has just started to not be hot. When turning the shower on, the hot water comes through but then quickly changes to be just warm. The shower does have a pump attached as we have very low pressure. All other taps work fine.

Is there anyone who can help me with this please regarding the reason for it happening, and is it easily rectified?
Thank you

[katoosh525]

Have you changed anything recently? Put a thermostatic mixer in (backwards perhaps) or any other change to your plumbing?

Do you have a thermostatic mixer if no other changes?

[DIYHelp]

Hi Katoosh525.

Thank you for replying.
No, nothing has changed at all. I do have a thermostat on the shower wall where I can change the water to different degrees. It has always been static on 35. I have tried moving this and it makes no difference?

[thedoctor]

Normally means the cold pressure is overtaking the hot. Take a look at our video on pressure reducing valves https://www.youtube.com/watch?v=ie_j3TFHpwg

[DIYHelp]

Thank you, yes this sounds like a possibility. I will take a look at the video. Thank you for your help.