overflow only when both taps open...!!

[razor123]

I live in a house which is all electric and only have an emersion heater for hot water, which is up stairs in the bathroom airing cupboard, which is quite new looking and supplies good amount of hot water.

My problem is this....when both hot and cold taps in kitchen (downstairs) are on, the overflow pipe sticking out the wall up stairs spill water out. When only one tap..either hot or cold is on then nothing comes out overflow pipe.

Before I call in a plumber to have a look has anyone any ideas what would cause this as a plumber may baffle me with science and rip me off.!!

Any ideas or advice greatly appreciated....thanks in advance

Dave

 

[Whitespirit66]

If the kitchen taps are a mixer, it's possible the mains cold to tap is making it's way into the hw cylinder through hot pipe. This then overfills the loft tank and goes out the overflow.

 

[razor123]

thanks for your prompt reply The tap in the kitchen is a mixer, but we have a loft conversion and no tank in the loft.

 

[buck51]

So I will guess that its a deck mixer or something similar, mains cold water passing into hot system,

Run the hot tap on its own the whilst feeling the hot pipe get somone to open cold tap and you will feel the pipe go cold!!!

 

[buck51]

easy fix limit the flow to the cold side.

 

[xr4x4]

If he hasn't got a cold tank, the hot water cylinder must be unvented?

 

[Whitespirit66]

Or maybe a fortic/combination cylinder.

OP. Please tell us what setup you have? What is the overflow piped to?

 

[Whitespirit66]

Edit. Just read loft conversion. So Fortic unlikely. Most likely unvented then.

 

[razor123]

to be honest no idea all I know is overflow pipe is about same height in wall as the emersion tank and I think it goes through the wall to behind the tank somewhere...!!
I am no plumber obviously...lol

 

[Madrab]

Fling on a picture of the cylinder then razor and we'll get it from that

 

[razor123]

her you go...best picture I can get...do I need to call in a plumber or international rescue...lol...

Untitled

• razor123
• 6 Dec 2013
• 1

Untitled

• razor123
• 6 Dec 2013
• 1

 

[gigz]

See the black plastic tundish on the right of the picture ?, is water going into that when the said tap is on ? If so you need a plumber with an unvented ticket.

 

[Madrab]

View media item 70023Just in case you don't know what the tundish is

 

[razor123]

thanks Madrab...will try and check later...water only flows out overflow when both taps are running...?

 

[gigz]

View media item 70023Just in case you don't know what the tundish is

Clever cloggs