Showers with 125mm pipe centres

[mfgs]

I need to swap an exposed shower mixer, it has 125mm pipe centres which is a new one on me, only seen 150 centres before. Can anyone recommend any? Its for a landlord so they aren't going to want to spend loads.

 

[Shower Engineer]

How about one of these Mini Valves

 

[mfgs]

They look pretty good.

 

[Scott_D]

Williams has them at a decent price

 

[Riley]

Bristan acute

 

[mfgs]

Bristan acute

Are the connections just 15mm compression?

 

[Riley]

Yep but have a real flexibility

 

[mfgs]

That's perfect then. Thanks for the help guys.

 

[gassafe]

I'm Installing one tomorrow, hopefully goes okay... it's on gravity so will be interesting to see performance as it states suitable for 0.1 bar

 

[Shower Engineer]

I'm Installing one tomorrow, hopefully goes okay... it's on gravity so will be interesting to see performance as it states suitable for 0.1 bar

If you are installing this on 0.1 Bar then consider removing the non return valves when you fit it. On low pressures they have a tendency to stick and you may end up being called back due to no flow. If in doubt try blowing through the inlet elbow and you will soon see what I mean!

 

[gassafe]

If you are installing this on 0.1 Bar then consider removing the non return valves when you fit it. On low pressures they have a tendency to stick and you may end up being called back due to no flow. If in doubt try blowing through the inlet elbow and you will soon see what I mean!

I have been considering this to increase the flow rate... are non return valves required on a tank fed hot & cold system... it can't back feed surely!?

I emailed bristan this very question & they recommended keeping them in etc as I was expecting!

I can't blow through th check valves relatively easily, but still a restriction no doubt

 

[ShaunCorbs]

as long as equal pressures your fine with non

 

[Shower Engineer]

I have been considering this to increase the flow rate... are non return valves required on a tank fed hot & cold system... it can't back feed surely!?

I emailed bristan this very question & they recommended keeping them in etc as I was expecting!

I can't blow through th check valves relatively easily, but still a restriction no doubt

They dont actually restrict the flow too much but every little helps. The real problem is when the shower hasn't been used for a while and the spring in the NRV keeps putting pressure on the seal and it becomes stuck, it's a real nussiance.
Only real issue with removing NRV's is when your customer then has a combi fitted and then doesn't refit them....

 

[gassafe]

They dont actually restrict the flow too much but every little helps. The real problem is when the shower hasn't been used for a while and the spring in the NRV keeps putting pressure on the seal and it becomes stuck, it's a real nussiance.
Only real issue with removing NRV's is when your customer then has a combi fitted and then doesn't refit them....

Or bristan dodge a warranty claim, iv had thermostats fail a lot on similar models... not even lasting a year

Isn't a combi equal pressures too tho, I guess the cold mains has more flow still and could overpower maybe?

 

[Shower Engineer]

Or bristan dodge a warranty claim,

Have you ever found that to actually be the case, with Bristan or any other manufacturer?
I always adopt the approach that if the installation or product modification has actually caused the problem then it may be chargeable, however, if the reported fault is unrelated to any other problem that I find then I would never charge in that case, but I would advise the customer.
For instance dripping from shower head with no filters fitted then to me that should be chargeable. Control handle broken and no filters fitted then that wouldn't be chargeable but I would fit the filters or advise they needed fitting.
It just comes down to common sense. Most manufacturers don't want to lose the goodwill of installers so unless it is a blatant installation problem that has caused the shower to fail then usually it would be FOC.

 

[Shower Engineer]

Isn't a combi equal pressures too tho, I guess the cold mains has more flow still and could overpower maybe?

Main issue here is cold water passing through the mixer to the hot side causing reduced temperature at other outlets.