Boiler firing up when toilet flushed

eidolon

eidolon

eidolon

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Joined
31 Oct 2002
Posts
13,892
Location
Newcastle upon Tyne
Just had a full new central heating system installed plus a new bathroom suite and I've noticed that when you flush the toilet it causes the boiler to fire up for a few seconds.

What's that all about?
 
Yes, lately it seems like my shower isn't as powerful as it was when I first had it fitted a few months ago but I wasn't sure if it was just my imagination
 
Most common cause is a dead end with air in it, when you run the cold tap water goes back and forth through the boiler as the air expands. Two solutions find the dead end and remove it or one way valve before the boiler!
 
a1ex2001 said:
Most common cause is a dead end with air in it, when you run the cold tap water goes back and forth through the boiler as the air expands. Two solutions find the dead end and remove it or one way valve before the boiler!
Click to expand...

That makes sense. I've currently got my washer/dishwasher and downstairs toilet capped off while I get some more work done so that's probably the cause. Glad it's nothing serious.
 
eidolon said:
That makes sense. I've currently got my washer/dishwasher and downstairs toilet capped off while I get some more work done so that's probably the cause. Glad it's nothing serious.
Click to expand...
Could be other things but that is the most likely our old boiler always did it as we had a capped off pipe for an old outside tap but that has now been removed. If it still does it when your work is finished then look into it further.
 
a1ex2001 said:
Most common cause is a dead end with air in it, when you run the cold tap water goes back and forth through the boiler as the air expands. Two solutions find the dead end and remove it or one way valve before the boiler!
Click to expand...

This, for definite. Its a pocket of air trapped in a dead end hot pipe. Could be the old vent pipe if you had one on the previous system. Fit a non return valve at the boiler, and dont forget the mini expansion vessel, otherwise you can pop the boiler seals. And we've seen this on a brand new boiler! Follow the manufacturers instructions.

Mick
 
FlyingFish said:
Fit a non return valve at the boiler, and dont forget the mini expansion vessel, otherwise you can pop the boiler seals. And we've seen this on a brand new boiler! Follow the manufacturers instructions.

Mick
Click to expand...

I can't see anything like those. What would they look like? (boiler is a Baxi Eco Tec 40kw)
 
They plumbed my upstairs toilet up to the hot water when they put the bathroom in. I didnt discover it until i'd lived here about 6 months.
 
That's nothing, we had a plumber come in as all-trades contractor for our bathroom and he plumbed in the shower feeds the wrong way around meaning the thermostatic shower didn't work. His flunkeys tried to cover it up by jerry-rigging the temperature control on the mixer unit.

I only found out the proper reason the shower temperature control didn't work very well about a couple of days before we were due to move (all contracts signed etc). We gave his guarantee to the people who bought our flat and he had to fix it. Which involved retiling the entire bathroom floor to ceiling as the tiles we had used were discontinued and he had no other way to access the pipe feeds
 
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