Shower pressure issue

[diy-guy]

Hi, I'm trying to improve my parents' shower. The problem is the cold feed to the mixer unit is extremely high pressure (much more than at my house, though both are direct feeds). It results in the issue below with the mixer unit for taps and shower (by pulling the plunger) for setting temperature..

On Taps:

1. Turn Hot to max.
2. Turn on Cold enough to get a comfortable temperature. (This is reasonably OK, though the cold is very sensitive, and only just on)

continuing:

1. Pull the plunger to redirect to shower.

The ultra high pressure cold seems to "reduce the hot flow into the shower" resulting in a cold shower.

continuing:

1. Reduce the cold to get a comfortable shower temperature.

The cold is now barely on, and setting it is extremely sensitive.

Question: Is there such a thing as an "inline pressure reducer" that I can fit in the cold feed to the mixer which will reduce this sensitivity?

This temperature setting arrangement may be a bit Heath Robinson, but it works fine in my house with somewhat less cold pressure.

Thanks in advance.

[Chris Hogg]

Plenty of mains water pressure regulators here

[Andy Burns]

Does the hot water to the shower come from a hot water tank?

If so ... then for good results you want a twin impeller shower pump (not a cheapy, or you'll be back to replace it before too long) with its cold feed taken independently from the same cold tank that feeds the hot tank, and ideally a separate flange to take the hot independently from the tank, rather than from the existing outlet of the hot tank.

[diy-guy]

[snip]

Thanks, I think that might do the trick.

[diy-guy]

Yes, it comes from a tank in the attic, which is exactly the same as my arrangement here which works well. I'm going to give the pressure reducer idea a go. Thnaks.