Just in the final stages of an extension, and the old "Z" rated back boiler is finally getting replaced. We've got an internal soil stack for the new downstairs loo which is about 1500mm from where the new boiler is going to be situated. I've been told by the building inspector that this internal pipe has to be a stub stack, so, can I condense the boiler into this stub stack (above the toilet outlet) which will then be boxed in?
Can I condense into a soil stack?
- Thread starter bones16
- Start date
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J
johnnojob
no
N
namsag
Is the stack plastic then yes there is no problem at all if its cast iron then the condense must enter below a level where waste water will enter so that it washed off the walls of the stack and not cause corrosion.
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Your obviously to thick for anyone to reply 
How do you stop the sewer gases entering the boiler?
It'll go into the soil stack approx 750mm above the toilet outlet and slope upwards with a gradient of about 15 degrees. Still ok to do or not.
Thanks for the replies so far.........
Slapper - me being a bit paranoid!!
My concern re the gases was 1. They smell, i didn't appreciate the condensate trap would act in the same way as the trap under the kitchen sink for instance 2. The gas will contain/ consist of methane which is somewhat flammable, rather like the French person who made his living on the stage igniting his farts, Spike Milligan explains the process better in his ww2 autobiography.
Providing the condensate drain is above the spillover level of the W.C. Pan it should be fine. (At 750mm unless you have a tall W.C. then it will be ample...)
If worst happens and drains block, the water will pour out of the W.C. before it gets anywhere near the boiler.
If worst happens and drains block, the water will pour out of the W.C. before it gets anywhere near the boiler.
most manufacturers say no to this (3 I know of) wb, vaillant and baxi.
MI's are to be adhered to in every aspect at all times!
MI's are to be adhered to in every aspect at all times!
Just pulled up vaillant MIs of random model.
WHAT'S this
The discharge pipe from the boiler condensate drain
must have a continuous fall (45mm per metre) and preferably
be installed and terminated within the building to
prevent freezing. The condensate discharge pipe must
terminate in a suitable position, e.g.:
a)preferably the discharge pipe should be run and terminate
internally to the house soil and vent stack (at
least 450mm above the invert of the stack). A trap
giving a water seal of at least 75mm (3) should be
incorporated into the pipe run.
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