Suggestions for bathroom plumbing setup

[Oddbod1]

I have to kit out a disabled bathroom with a Doc M type setup.

If we want to fit a douche shower/toilet spray (circa. cost £25) but we want warm water rather than the mains cold, together with other requirements to have a single lever basin tap, is it best to have an independent thermostatic value that will supply mixed warm (not hot water) to both the douche spray and to the basin or have independent thermostatic valves for each item?

 

[Madrab]

1 thing, you need to deliver the water to a douche from an isolated, break tanked, water supply. It is not acceptable to have a toilet douche (that can reach inside the bowl) that is mains supplied, it requires CAT5 protection.

One setup correctly it could all be supplied through a remote Themostatic Mixing Valve (TMV2/3 rated) to maintain a constant water temperature.

 

[Oddbod1]

When you say reach inside the toilet bowl, it's not an integrated toilet bidet spray. It's one of those handle ones.

 

[Aquaheat]

Even a handle one, as you call it, will need it to be inside the bowl for it to function and you will be compromising water regs as you have a chance of contaminating the mains water supply with cat 5 waste. (fanny batter as it's known by some here )

You're only option of doing it correctly is with a break tank which allows a break, funnily enough, between mains cold and the waste water.

Jon

 

[Oddbod1]

Link to a break tank?

 

[Aquaheat]

http://www.arrowvalves.co.uk/shop/fluid/fluid-category-5

Not an advert or recommendation but Google is your friend

Jon

 

[Madrab]

Link to a break tank

It's a cold water storage cistern that's filled from the mains that has a Type AB air break too avoid Cat5 backflow contamination. e.g. A cold water storage cistern in a loft. That then supplies the hot water cylinder. They then feed the outlets via a shared remote TMV2/3 valve to provide scalding protection, especially if its for disabled use.

 

[muggles]

Link to a break tank?

You aren't allowed to have one of these sprays connected to a mains water supply. They must be supplied from a tank in the loft. If you have a combi boiler or unvented cylinder you'll need an alternative means of supplying it with hot water as you can't connect it to either of those

 

[Oddbod1]

Can it somehow be connected to the water cistern of a Geberit wall hung frame like the one in this link - although no mix with hot water
http://www.building-supplies-online...112m-up320-for-disabled-wc-111352005-111.html

 

[Oddbod1]

Does anyone know if this is possible? maybe wont get as good a pressure.

What about fitting a non return valvue?

 

[Oddbod1]

any comments about a non return valve been fitted please to overcome the issue?

 

[Madrab]

Non return valves are no use, even double check valves aren't suitable as they only protect to Cat3. Only a cistern with a suitable air gap provides Cat5 protection which is needed here. Your cistern idea could be used but it's designed to flush through a 40 odd mm flush pipe, not a 15mm water supply pipe. It could be modified though I guess.

 

[AGAS]

just wash your ass like any other person