Dual flow kitchen tap

[dbrb2]

Hi,
I have a kitchen where the cold water comes from the mains, but the hot water comes from a gravity fed tank in the airing cupboard on the floor above.
I would estimate the header tank for that, which sits above the hot water tank, is about 4m above the kitchen sink.

As far as I can tell, this means I need to try to find a kitchen sink tap that will:

* Operate down to ~0.3 bar for hot
* Operate up to mains pressure for cold
* Fit to a single hole mounting point in a sink
The two above requirements seem to mean I need a dual-feed tap, where the water from hot and cold does not mix until it leaves the tap.
This seems to be a query that is asked quite a lot, but almost all the manufacturers pages I can find seem quite shady as to whether they do this or not....

Does anyone here have any experience of available taps that might fit the bill? "House of Enki" seemed to have some...but there were also some reviews suggesting they were not in fact dual flow.....

There was also a discussion here a while back, but there didn't seem to be any suggested products that came out of it:

Please help - actual dual-flow kitchen mixer taps?

Hi. Today my kitchen mixer tap broke (head snapped off the cartridge). Pic of the tap: From a quick Google, it's an obscure cartridge so I'm better replacing the tap. However, I have an old heating system with a Baxi back boiler and a cold tank in the loft and hot water in upstairs airing...

www.diynot.com

Thanks in hope!

 

[HERTS P&D]

Pick one:

https://www.screwfix.com/c/bathrooms-kitchens/kitchen-taps/cat820368?pressuresuitability=suitable_for_high___low_pressure_systems;suitable_for_low_pressure_systems;suitable_for_gravity_pumped_systems

Andy

 

[dbrb2]

Ah thanks - the problem I had was that many of the taps I could find (for instance on the link above), when you checked the datasheet, actually mentioned they were single flow - with the water mixing inside the body of the tap - and so less likely to work on a system where one flow is high pressure, the other low

I couldn't find any that were explicitly dual flow, with the two streams being kept separate until the exit spout

Taking a description from a random website:

"
Single flow taps are becoming more common in the UK. The water mixes in the body of the tap and spout and gives a greater flow due to larger outlet/spout diameter. They provide for an even temperature mix at spout exit. Non return valves must be fitted if on an unbalanced system.

Dual flow taps used to be standard in UK homes. These are where the Hot water is fed through the centre of the spout, separate from the cold. The spout will not get too hot to touch. Non return valves are not required in these instances when installing a dual flow tap.
"

 

[dbrb2]

Ahah!

https://www.abodedesigns.co.uk/downloads/specifications/at1222spec.pdf

This unit states "dual flow" explicitly in the datasheet (whereas many of their similar products state "single flow" - though I will also ask them to confirm....

The unit also comes with copper tails, not flexi pipe - I'll need to check with my plumber how much of a pain that is or isn't for him....but the site also says it is "M12 fast fit connection" - so I assume if it is a pain, he could use:

https://www.screwfix.com/p/essentials-flexible-tap-tails-12mm-x-15mm-x-300mm-2-pack/5891G?tc=BT1&gad_source=1&gclid=EAIaIQobChMI-ICL_dveigMVXZNQBh2oTxRWEAQYASABEgJuM_D_BwE&gclsrc=aw.ds