Cistern siphon is the internal overflow type,can anyone who has experience 
of these please tell me if they can be relied on and are they fitted as 
standard on new installations.They are new to me but I am not in the 
building trade.

"Paul Saunders"  wrote in message 
news:dfi1l9$dgk$1@newsg2.svr.pol.co.uk...

> I've got one in my bathroom and it's been fine. Wish I'd known about them 
> when I put in a downstairs loo as the only place I could run an overflow 
> was into the garage. They aren't actually syphons, they just open a valve 
> on the bottom of the valve and just release the water into the pan. Much 
> better in my opinion


I agree, but in the UK, AFAIK these things are not legal. The idea of a 
syphonic type is that water cannot continue to trickle over into the pan 
without anyone knowing about it, neither can water back its way into the 
mains.

The type Paul mentions is not, I think what the OP is talking about, 
although it does work well. But syphonic ones work well and are ubiquitous 
in the UK.

Rob Graham

>
>> I've got one in my bathroom and it's been fine. Wish I'd known about them 
>> when I put in a downstairs loo as the only place I could run an overflow 
>> was into the garage. They aren't actually syphons, they just open a valve 
>> on the bottom of the valve and just release the water into the pan. Much 
>> better in my opinion
>
> I agree, but in the UK, AFAIK these things are not legal. The idea of a 
> syphonic type is that water cannot continue to trickle over into the pan 
> without anyone knowing about it, neither can water back its way into the 
> mains.
>
> The type Paul mentions is not, I think what the OP is talking about, 
> although it does work well. But syphonic ones work well and are ubiquitous 
> in the UK.
>
> Rob Graham
>

Thanks to you both.I have tested this one of mine and it works well

Tab

In article <dfi0n6$14m$1@nwrdmz02.dmz.ncs.ea.ibs-infra.bt.com>,
	"tab"  writes:

> Cistern siphon is the internal overflow type,can anyone who has experience 
> of these please tell me if they can be relied on and are they fitted as 
> standard on new installations.They are new to me but I am not in the 
> building trade. 


They should be.
Test it by holding the ballvalve float down so the cistern
overflows at full inlet flow, and make sure the overflow
mechanism can handle this without water spilling out of
cistern via some other path.

-- 
Andrew Gabriel

These valves do, in fact have wras approval. Screwfix sell them as do 
suppliers of fitted bathroom furniture. I can't see why they they wouldn't 
meet the regs as back-siphonage is just as improbable as with a syphon. Just 
because syphons are ubiquitous tot he UK doesn't mean that new ideas 
shouldn't be introduced. In fact these units give a more powerful flush as 
the water gushes much more quickly meaning that you can have a much smaller 
cistern using less water.
"Rob graham"  wrote in message 
news:dfi4t3$d3n$1@nwrdmz02.dmz.ncs.ea.ibs-infra.bt.com...

>
> "Paul Saunders"  wrote in message 
> news:dfi1l9$dgk$1@newsg2.svr.pol.co.uk...
>> I've got one in my bathroom and it's been fine. Wish I'd known about them 
>> when I put in a downstairs loo as the only place I could run an overflow 
>> was into the garage. They aren't actually syphons, they just open a valve 
>> on the bottom of the valve and just release the water into the pan. Much 
>> better in my opinion
>
> I agree, but in the UK, AFAIK these things are not legal. The idea of a 
> syphonic type is that water cannot continue to trickle over into the pan 
> without anyone knowing about it, neither can water back its way into the 
> mains.
>
> The type Paul mentions is not, I think what the OP is talking about, 
> although it does work well. But syphonic ones work well and are ubiquitous 
> in the UK.
>
> Rob Graham
>