Bathroom taps for unbalanced water supplies

andrew-b

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ozskin

possible if you put check valve in but will always be fighting each other, could put pressure reducing valve on cold mains and solve that way or as you say twin flow

WestonDave

andrew - if I understand your question right we had Bristan Java mixer taps running off unbalanced supplies - they look fairly similar to the ones you have chosen and we had no problems even tho the hot water tank was literally next door to the bath room so no head at all over them. We had no problems with them in the time until we moved. The design is slightly different in that they have a "hole" in the handle. http://89.145.100.46/epages/webstore.storefront/?ObjectPath=/Shops/bristan/Products/%22J%20WMBSM%20C%22 if you are interested.

WestonDave

From memory the bottom of the cylinder was roughly basin height as it was raised up within the airing cupboard (storage shelves underneath which was a daft way of doing it!), with a relatively small amount of room above it before the ceiling, and the cold tank was directly above it on the floor of the loft so very little head above the tank.

We had the basin mixer with a pop up waste, but we only had the bath mixer http://89.145.100.46/epages/webstore.storefront/?ObjectPath=/Shops/bristan/Products/%22J%20SLBF%20C%22 not the shower version. Going off topic here but what we did have was the fantastic Aqualisa Quartz shower which is the one thing about the old house that I miss. Worked like a dream - pump/mixer unit in the loft fed the water down the tube that holds the shower head and had a control wire running back up the same tube to control the pump/mixer. I'm not sure you'd get enough pressure to run a tap based shower as you are suggesting off a gravity fed cylinder - that was the reason we went for the Quartz because it has an integral pump.

(Just replaced a monster floor mounted boiler in this house with a combi - gas consumption has halved (obviously on hot water and cooking only))

TighterThanTwoCoatsOfPain

i have recently installed a new sink and mixer tap in our utility room..

the cold is mains supply, the hot is gravity fed. Tap fitting instructions suggested that unless it was a balanced supplies there 'may' be issues which would be resolved with a no return valve on the hot supply.

I just installed anyway on the basis that i would install a valve if had any issues.. Ours works just fine.

Our hot supply pressure is provided from gravity drop from a HUGE cold water tank which is in the loft.

That said, if you're plumbing from scratch fitting a check valve would be a doddle (assuming there is room!) then no danger of having issues later. Perhaps i was lucky!

ozskin

andrew twin flows are rare but will look through my books at work tomorrow for a solution, grohe used to be fab but quality of late on some products has been questionable, and im an authorised premier dealer or whatever they are calling us these days, though putting an old eureco in my new bathroom, loved the design. eurodisc is still ok i think. think there is a modena twin flow similar style but will try and find time tomorrow to hunt out the manufacturer

knightstyle

A few years ago we had a flat with a similar problem. I resolved it by putting in a pressure boosting pump at the hot water tank outlet. This solved the problem and meant I could install a decent shower to replace the electric one. The pump was a single impeller one like the powershower pumps. Easy to fit and had no more problems.