Therostatic Mixer Shower has low pressure

[Mr Ben]

Hi, I have a thermostatic mixer shower fitted in my shower cubicle but the pressure isn't satisfactory. I'd like to increase it but don't know how. I don't want to replace it and the cubicle is new. Can I boost the pressure? I have a cold water supply to the shower coming from above ceiling (I guess a storage tank in loft) and the hot water seems to come from below floor (ie from HW cistern in airing cupboard). The boiler is downstairs but looks like it only has 22mm in and out?? I'd appreciate any help.

 

[peter anderson]

There are two ways to boost pressure: booster pump or raising the height of the cistern. Which is low pressure, the hot or the cold or both?

 

[Mr Ben]

Thanks Peter...the hot has the low pressure. What is the best pump to fit if I choose this method?

 

[oilman]

Have you checked the mixer is not scaled up? this is common and occurs on the hotside more than the cold.

 

[Mr Ben]

Hi Oilman, the mixer is a new one.

 

[Mr Ben]

Thanks for the help!

 

[peter anderson]

I have no idea which pumps are best. The only name I know is Grunfos.