No hot water to the bathroom

[Helpvin]

I am only getting Luke warm water to our bathroom at both the sink, bath and shower, but get hot water to kitchen downstairs. New bathroom fitted in June but noticeable in the last few weeks it has got worse. A boiler service yesterday with British Gas States combi boiler working fine but they say there is a fault with the mixer valve backflowing to boiler. I have spoken to the plumber who fitted the bath but he says there is not a mixer valve fitted and is a boiler issue

Boiler is a glow worm 24c combi boiler that is 3 years old.

After reading some forums Today I ha ve run the shower and bath at the same time and the bath water comes out hot and the shower cold? What would cause the bath to only be hot this way.

Thanks

 

[Newboy]

cold water backflowing through the shower valve.

When the shower is open then the cold water has somewhere to go hence hot water at the bath. When the shower is closed then the cold water backflows into the hot supply and you get lukewarm water at the bath

 

[45yearsagasman]

+1

 

[Helpvin]

cold water backflowing through the shower valve.

When the shower is open then the cold water has somewhere to go hence hot water at the bath. When the shower is closed then the cold water backflows into the hot supply and you get lukewarm water at the bath

Thank you , Is this sort of problem an easy fix?

 

[mcmoby69]

new bathroom, new shower?

pipework should be flushed through before shower valve is fitted to prevent problems like this occuring. did your installer do this?

Or, there is a length of 22mm pipe on the hot water pipe run that should have been re run in 15mm.A 22mm pipe lets a bigger volume of water pass through the boiler heat exchanger too quick to pick up the required heat.

More noticeable in winter when the incoming water temp is a lot lower, and, it depends on the position of the boiler and your bathroom.

what model boiler do you have?

 

[Newboy]

Thank you , Is this sort of problem an easy fix?

Fit non-return valve in the supply pipework to the shower

 

[WabbitPoo]

Thank you , Is this sort of problem an easy fix?

Fit non-return valve in the supply pipework to the shower

How easy it is to fix (to answer the question) therefore depends on if you still have access to the pipe runs. Or, get the plumber to sort it, as he left you without a properly working system.

 

[mcmoby69]

most new showers (if not all) have non return valves built into them. get them checked first. then start looking at pipework.

 

[gigz]

Easy way to check is if you have isolating service valves fitted to the shower. Turn off the cold supply valve and see if the hw coming out of the tap gets hotter. BTW if it was a boiler problem you wouldn't usually get hw from any outlet.