Loud Toilet Flushing - New Combi Boiler Installed

[geo-yakult]

Hi there

Just had my old conventional boiler replaced with a combi system. The hot water and water tanks all removed.

Now that the cold feed is running directly from the mains - it seems the flow is now immense. So much so that one of my toilet (old type) makes a really loud noise when flushing.

I heard that because of my old system works with low pressure (gravity fed) and now that the cold water is coming directly from the mains, the flush system is now requiring a high pressure type.

does anybody know which one I need to buy that would be compatible with my toilet? Picture is attached - feed is coming from the bottom with a lever type flush.

 

[RandomGrinch]

You could try turning the isolator a little more horizontal, the flow can be reduced to what it was before. It also helps if you have water hammer from a washing machine.

 

[ianmcd]

you just change a small part, your installer should have done it when fitting the new boiler , get them back and tell them you wont be paying for it, as it is part of the job

 

[polesapart]

https://www.screwfix.com/p/flomasta-plastic-part-3-float-valve-/500FY

You might get away with swapping the diaphragm washer and the white HP insert into the old valve.

 

[CBW]

If it’s making a noise whilst refilling, it could be coincidence and will probably just need the washer inside changing - which would be separate from the combi install. It could be the orifice, which could need changing, which is what Ian will be referring to. I take it the toilet wasn’t mains fed previously?

 

[geo-yakult]

Sorry to be more exact, the noise isn’t coming from the toilet per se, more like the cold water pipe running to it, it’s like the flow is immense. It’s not the pipe banging noise you usually associate with pipe sounds.

I believe the toilet was fed from water from the stored water tank. Noise previous came from there when toilet was flushed but now that those tanks are removed, flushing comes from the mains feed.

 

[geo-yakult]

you just change a small part, your installer should have done it when fitting the new boiler , get them back and tell them you wont be paying for it, as it is part of the job

Boiler was installed by British Gas - I don’t think they are responsible for “repairing” this - install boiler and make sure pipes are running for hot and cold - job done.

It’s likely the low pressure/higher pressure difference between gravity fed and mains fed that sounds the most feasible reason - just want to know if this so and which product do I need to buy to convert my toilet to the high pressure valve.

 

[geo-yakult]

You could try turning the isolator a little more horizontal, the flow can be reduced to what it was before. It also helps if you have water hammer from a washing machine.

What’s a water hammer?

 

[CBW]

It does sound more like what Ian stated, about the orifice needing changing from low pressure to high pressure. This should be done by any installer converting from gravity fed to mains - something that should also be discussed initially.

 

[ianmcd]

Boiler was installed by British Gas - I don’t think they are responsible for “repairing” this - install boiler and make sure pipes are running for hot and cold - job done.

It’s likely the low pressure/higher pressure difference between gravity fed and mains fed that sounds the most feasible reason - just want to know if this so and which product do I need to buy to convert my toilet to the high pressure valve.

of course they are responsible for it, they changed the pressure not you, they should do it correctly

 

[geo-yakult]

of course they are responsible for it, they changed the pressure not you, they should do it correctly

I’ll reach out to them and see what they say.

 

[ianmcd]

NO tell them you want the jo done correctly, dont reach out to them, if it was a one man band that done it you would soon complain, they are no different , just a lot more expensive

 

[muggles]

For the premium price you pay BG over a local independent, you should be expecting a premium service including doing a full low pressure to high pressure conversion correctly.

 

[HERTS P&D]

A nice new fluidmaster float valve would sort it out:

https://www.screwfix.com/p/fluidmaster-bottom-entry-pro-bottom-entry-fill-valve/81274

with a bottle of bleach poured into the cistern and left overnight.

Andy

 

[dilalio]

You could try turning the isolator a little more horizontal, the flow can be reduced to what it was before. It also helps if you have water hammer from a washing machine.

Won't change the pressure and more likely to sound even more like a missile flying past.