[Closed] Cisternless toilet - mains fed?

Move to France or Spain and you'll be fine!

I have a couple of enclosed cisterns I bought back from Germany with me when I built this place. Very sleek look. Are fully serviceable via the flush plate hole so tiling them into a wall is not a problem later on. 17 years in and I haven't had so much as an issue with them mind (cue a broken loo next week).

I see they have a UK website presence so must be fine over here with UK building regs.

https://www.geberit.co.uk/products/bathroom/geberit-toilet-cisterns/

The other type of main fed flush from Germany... nah, forget it. You wouldn't want one of them 🙂

Can I have a mains fed direct to toilet and do away with the cistern for a slicker look?

That doesn't sound very effective.

Looking for some sort of valve to fit on the mains like in other countries and do away with the cistern and do away with the closed couple up against the wall.

I think you need an air gap to meet the building regs/water authority regs.

You’ll need a air break to meet WA regs mate.

We're doing it with urinals on a project at one of the airports, you'll need an air-break but 'pipe interrupters' exist which give you Cat 5 protection against back siphonage, which I *think* is enough for a toilet bowl, not sure how back pressure would exist without the whole bathroom being flooded to ceiling level!

It's basically just a nozzle on your mains feed which 'squirts' into a larger downpipe through which the water flows to the toilet bowl. I guess the issue might be if the outlets on the toilet bowl provide any resistance to the flow, in which case you need to size your downpipe to contain the volume of the flush so it doesn't overspill.

See what Cistern-miser offer

Could I use something like the "Easy Flush - Direct Mains Flush"   into any back to wall toilet base and bypass the cistern or does the cistern need to be used to chuck enough water to clear numbero 2's?

Depends on the toilet bowl I think, modern toilets are getting designed for lower flush volumes (seriously, slippier coatings etc.) so you would need to check. If it's the Cistern-miser EasyFlush Direct you're looking at then it seems to claim it can do a full flush. Unless you have really crappy mains pressure or really small pipes, it should just be a case of the valve opening long enough to let the right amount of water through. Quite often that's adjustable.

The gym i use in spain has direct fed toilet flushes that reuse the pool water.  Pressure is massive it gives a bit of a shock at first.  Never seen them anywhere else.

Any direct connection is illegal and a potential hazard to health

Modern toilet design is done for good reasons except for flapper valves which should never have been approved

Just install a bidet and no toilet.  Cut out the middle man so as to speak 😉

And a lifetime supply of picolax??

there is a built in cistern frame available that acts as a lintol so you can build it into a block wall, never seen one personally but I know of their existence.

Surely you just want a concealed cistern? Doesn't getting rid of the cistern mean you'd need a very high flow rate of water to be effective (i.e. the cistern as an accumulator for the water)???

p.s. we have Gerberit concealed cisterns at work, about 10% are broken.

I wouldn't mains feed a toilet even if it's just for resale value – I know that if I looked at a property with a set-up like that the first thing I would want to do would be to change it for a standard cistern. I don't really know why you would do anything other than the norm (ie, a close-coupled toilet either boxed in or simply exposed and up against the wall).

wet room and waffle stomp it?

Not legal in the UK. Contravenes water regulations and even if you're on a private water source the recomendation is you follow the water regs.

Probably wouldn't flush properly in a toilet designed for a cistern flush.

Pipe interuptors are rubbish on urinals and while in theory may make the toilet legal will never flush properly.

You want a back to wall or wall hung pan with a concealed cistern. Geberit as above are the leading brand of the frame and cistern then attach your favourite toilet pan.

Tom, genuine question, what's the issue with pipe interrupters and flush valves on urinals?

We'd been asked to consider them by a client who'd suffered too many problems with float valves. I couldn't see any issue with a flush valve system so that's what's specced.

Still got time to change if they're inherently crap!

I'm not a plumber but I worked in an office block where there was a big remote cistern just for toilets (thus meeting regs) and flush valves for each WC. But the pipework has to be able to discharge about 100litres/min, which is about 5 times what I get from a bath tap on 22mm copper. So not feasible for domestic.