New Shower Required

[Pat55]

New to this!

We have a shower that runs off the hot water cylinder.

After a short shower, the temperature of the water decreases, until it is cold. This happens even though we turn the hot/cold tap, on the mixer tap, to the highest temperature mark.

When turning the hot tap on another part of the hot water system, immediately after the incident with the shower loosing heat, there still, seems to be plenty of hot water left in the system.

Any advice why this should happen?

Iam willing to change the shower . Any advice which I should choose? i.e Electric or new thermostatic with assisted pump?

I am unsure wether the mixer unit on the shower is manual or thermostatic? Any advice on how we can check this out?

Sorry ,lots of qqueries.

Regards,
Pat55

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[JPC]

i think you'll find the cold water is pushing the hot water back up the pipes due to the cold water being at mains pressure.

i take it you get hot only ok but when you try to introduce some cold all the hot goes away ?

 

[Pat55]

Thanks.

It is after a while of introducing the cold water, that the hot water decreases in temperature, not straight away.
Pat55