Thermostatic mixer shower with low pressure

Question

Thermostatic mixer shower with low pressure, cold mains, hot header tank/cylinder. Please advise. What could be the cause of this?

Paul · Accepted Answer

A thermostatic shower only works properly if the hot and cold feeds are the same pressure. If you have a shower fed by cold water mains and hot water from a cylinder you will probably need to boost the hot water pressure to match the cold. This can be done by raising the header tank feeding the cylinder or usually the best option is to fit a shower pump.

Danny · Answer

Could possibly be a blockage in the filter in the shower, shut the water off and clean the filters on the shower.

Alex · Answer

Hi,
As already mentioned the hot and cold water supply to the shower need to be at the same pressure. The pressure from the cold will be higher if it comes from the mains compared to the pressure of the hot coming from a hot water cylinder. The pressure of the hot is worked out by taking the head from the tank in the loft to the shower head. IE bottom of tank to shower head = 1 metre then the pressure will be 0.1 bar, which is not a lot.
To improve this, a shower pump is fitted taking the cold from the tank in the loft and hot from the cylinder in the airing cupboard. You could put a single pump on the hot as an alternative. It is also worth checking the mesh filters at the back of the shower mixer valve to see if there is any debris. This is done by taking the mixer valve off.

Dan · Answer

It's normally an issue with a cartridge filter blockage, but it depends on the system set up on pipework.

Craig · Answer

Hi, if you have a header tank then the cause is possibly due to you having a gravity fed system rather than a combi boiler which is a pressured system.
Cheers,
Craig

Thermostatic mixer shower with low pressure

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