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Washing machine pipe connected to boiler

 

Can the combi boiler PRV/overflow pipe go into the washing machine waste? I have just moved into a flat and the boiler pipe seems to merge in a T connector with the grey water pipe from my washing machine.

Sometimes it takes a long time to empty and I wonder if this is to do with the boiler.  There is a lot of gurgling and it seems like air might be blocked in the pipe which is a bit worrying because it is connected to a gas boiler.

attackparden

Martin London

The condensate pipe could have been fitted with a clamp or the waste pipe could have been teed so condensate and washing machine have their ''space''. As it is now, WM waste pipe will struggle to fit in there with ease. What make of boiler is it? Has the tenant had problems before with backflow of waste water into the machine? The discharge of condensate from boiler is not enough to create a problem like the one she envisage. Except there is a blockage in the waste pipe or there isn't enough fall in the pipe, I don't see how the condensate waste will back into the WM. It will, if there is a blockage in the waste pipe

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I cannot say for certain whether this kind of setup is 'approved' by boiler manufacturers, but can say with reasonable certainty that there shouldn't be any issue of 'backing up'. For a start there is an air gap around that waste pipe even when both other pipes are inserted. Then there's the simple fact it would take some pressure to force the water back up in to the boiler. In theory it could happen, but that would need a ridiculous set of circumstances - a blocked waste pipe further down coupled with a blocked entry in to that waste pipe top.

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I'd personally have preferred a dedicated condensate waste connection to that waste pipe using a boss or tee or similar. But hey. I think there is possibly more of a risk of the W/M outflow coursing past that condensate outlet and syphoning the condensate trap empty with the resulting suction? In fact there was a thread on here not too long ago with a guy saying his GasSafe condemned such a setup 'cos he noticed the condensate trap level wobbling when the washing machine was used - and slapped a 'DON'T USE' notice on the boiler until the cove fitted a separate inlet. I think all he had to do was to add a 'tee' into that vertical waste pipe near its bottom (just above the U bend connection) and then an elbow to take an identical pipe up parallel with the first. The condensate pipe emptied into this one - with the cond pipe end only going in an inch or so, so no risk of hitting W/M water level.

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