Changing a thermostatic shower bar unvented system

[BertyFish]

Looking for a little help,

It’s a Sunday and a bit risky but should I give it a go?

We have a dripping thermostatic shower mixer that it dripping so looking to do a straight swap over.

We’ve only lived here for a year so never drained the system, always had combi boilers so can just turnoff the stop tap and drain the system.
New house has a pressure unvented system.

Do I just turn off water, turn the tank off and drain water out of all taps?

[BertyFish]

Shower mixer in en-suite -




Boiler set up -

[Rough101]

Turn off the power, and just turn off the water, it’s mains pressure fed just like your combi, no water in, no water out.

[BertyFish]

Thanks, the boiler is downstairs and pressure tank upstairs, as easy as you say?

[Rough101]

Oh, so it s not an electric unvented, just a boiler fed one?

So yeah, boiler off, mains water off, and that s you, unless the shower is lower than the cylinder, in which case just draw off the head via a tap.

Edited by Rough101 on Sunday 9th November 12:29

[BertyFish]

Sorry yes gas boiler downstairs,

Just worries me about the pressurised tank being empty after a quick Google -

https://www.google.com/search?q=if+i+want+to+chang...

[Xcore]

Turn mains water off and open shower to drain water. Unbolt it all and refit. Job done.