Gas safe installed new gas boiler and heating. Then another plumber installed the downstairs loo. Now when I flush the toilet the boiler loses pressure to zero and has to be filled every day. Even if I do not flush toilet pressure drops and I refill every day. The plumber did connect to two pipes near the boiler. What's wrong and what can be done? is it some sort of one way valve missing? The Boiler is a combi BIassi
Boiler loses pressure when LOO is flushed
- Thread starter kotewala1
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Contact the boiler installers to report pressure loss.
Gas safe dont install anything, get the installer back it has been done wrong
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Hot flush? 
Had a plumber mate who did that, plumbed the toilet into the combi hot outlet, he is known to this day as jimmy hot erse, I got the call to it, customer says when I flush the toilet steam comes out, I thought that was just me on a sunday after a kebab on the saturday when we were allowed outHot flush?
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So when you flush the toilet the boiler looses pressure, and when you don't flush the toilet the boiler looses pressure? Seems like you could have just said the boiler looses pressure everyday as it would appear to have f all to do with flushing the toilet?
he said nothing to do with him. he left it working . Plumber who installed downstairs toilet T into heating system
Boiler NEVER loses pressure if I dont flush or dont use tap in loo room
100 % correct . Teed into hot and cold from Boiler. Feeding the Cold to cold cistern . Hot from boiler to tap on vanity sink . Any easy solutions?
pressure does NOT drop if wc not flushed or vanity tap not used
Totally unhelpful and unnecessayHot flush?
It was a joke ya miserable ****.
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This ain't rocket science. The only problem is your "plumber" used sh*t for brains. Get him back to repipe or better still get a real plumber and back charge the first for not only the rework but for completely refilling your heating system with inhibitor.
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