I have a recently installed thermostatic shower valve. If I change the
temperature setting from 38 deg C to 30 deg C, there is a delay of 5
to 6 seconds before I feel any difference in the temperature of the
water in the shower. Is this reasonable?

Guy King wrote:
The message .com
from "DaveHJH" contains these words:

I have a recently installed thermostatic shower valve. If I change the
temperature setting from 38 deg C to 30 deg C, there is a delay of 5
to 6 seconds before I feel any difference in the temperature of the
water in the shower. Is this reasonable?

How else would you expect it to work?

There's a fair bit of water in the boiler unit, then there's the length
of the pipe to the shower head - both of which add up to several seconds
delay. To have an instant effect the heating element would have to be
just behind the holes in the head, which would be silly.

--
Skipweasel
Pay no attention to that man behind the curtain.
I think you misunderstood - it isn't an electric shower, just a
thermostatic valve fitted to the hot and cold supplies - no water
heating involved at all.

"DaveHJH" wrote in message
oups.com...

I have a recently installed thermostatic shower valve. If I change the
temperature setting from 38 deg C to 30 deg C, there is a delay of 5
to 6 seconds before I feel any difference in the temperature of the
water in the shower. Is this reasonable?

If it is off a combi or any mains pressure system, then install a pressure
equalising valve in the hot and cold to the mixer. These react fast to any
imbalance between the hot and cold. The mixer may already have one inside.
Check. If not fit one.