Combine waste from shower with outlet from combi boiler

[Paulsmith01]

I had a new combi boiler fitted last year on the ground floor

It has a vertical waste pipe of 20/30mm in diameter. It is about 1.2m long.

There is a horizontal pipe which has a very shallow incline. This is 3 metres long. This runs into the drain.

Last winter, the horizontal pipe froze repeatedly and had to be defrosted with kettles of boiling water.

I have recently had a shower fitted on the first floor.

The waste from this has been plumbed into the vertical waste from my boiler.

Is this advisable? Seems fine at present, but my concern is if the horizontal pipe freezes, I could potentially damage the boiler and also flood the bathroom.

Am I being overly cautious?

 

[The Baker]

How much pipe is fixed to the exterior?

A few pictures will help.

Tim

Ps

During the very cold winter of 2010? a vertical 4 foot length of 40mm plastic waste froze solid in just over 2 days, but it only carried the constant drip from the boiler condensate.

If you shower once a day there is every chance the waste water from the shower will melt any build up within the pipe well before it can freeze solid.

A HepVo trap just below the boiler would prevent back flow from the shower into the boiler area.

 

[Paulsmith01]

All pipe work is external.

The boiler waste froze several times last winter, when it snowed and we had a cold snap in Surrey.

I’ll attach pictures tonight.

 

[The Baker]

Inside and outside pics if possible.

Tim

 

[Paulsmith01]

Pictures below.

 

[Bodd]

It's not ideal If it's not possible to run inside I'd say increase diameter of pipework as much as you can

 

[Hugh Jaleak]

Where does that downpipe run to? A shower waste should run to the sewer. Discharging that into a rainwater drain or soakaway is not permissible.