Backflow problems with mixer taps/showers

[mikeygas]

I would look at balacing your mixer shower properly while your at it, as the cold water into your shower should come from your large cold water tank and not fed directly from your mains. What colour is the water in your large tank i.e is it brown/reddish, as this could indicate you have a leak in your cylinder coil.

 

[CTE1]

Fortunately the colour is clear, so am hoping its not the coil, and will be resolved by the balancing.

The plumber is switching the cold supply from mains to tank tomorrow, so fingers crossed...

 

[mikeygas]

All the best, post a reply to let us know how you get on.

 

[macplumb]

If you want to check for a leak the coil have a look at the hot water is it clear or slightly yellowish? If yellowish could be a coil leak. Lowering the pressure to .9 bar is still 9m of head so water can still make it's way up to the tank. I would say it's a mixer passing on tap or shower have you seen the secondry nrv it might not realy be there. Wouldn't think it was the coil remember water always finds it's own level unless it is a sealed heating system and vented hot water. When you say water in the cistern is warm this will be due to expansion and lite warm water riseing above the heavier cold water. Hope this helps.

 

[CTE1]

Thanks for everyone's help, we have now finally nailed this problem!

Our plumber balanced to system by connecting all mixer taps/showers to the cold water tank feed as opposed to the mains water feed. Apparently the balanced feed pipe had been capped by a previous plumber, and this was hidden under floorboards near the bathroom. So he reconnected this, and just left the mains water supplying the kitchen taps and washing machine.

 

[Deleted member 95995]

Just a quick 'thank you' to participants in this thread. I had the same problem with my elderly mother's "Aquability" shower. They finally came out and fitted a new non-return valve and a pressure reducer on the mains feed. But why the over-engineering? Why not use the balanced cold feed from the header tank in the first place? Do they just not like going into lofts because there might be spiders up there?