No Pressure for Mono Block Tap kitchen Mixer

Wife and motherinlaw bought a Franke sink and Monoblock Mixer for me to fit in the mother inlaws kitchen ground floor flat. So new worktops, units redistributed and new hob and sink in.

All was going great until I finished the lot. Cold water is from mains at a bout 2 bar happy days it has lots of pressure.

New the problem, the mixer tap needs 0.5 bar, did not notice that and the h ot water tank is beside the kitchen with the storage tank 10mm above the ho t water cylinder so the pressure must be about 0.05 bar. The hoses to the m onoblock have little non return valve.

There is just a drip coming out the mixer when the hot is turned on. In the bathrom which has old fashioned taps the hot water would fill a glass in s ay 15 seconds so litte pressure.

She has an elctric shower so does not need hot water for that.

Options for the mixer tap comments please.

Put a 3kw instant heater in the cupbord below the sink fed by the cold tap feed that is 15mm. I assume again very little flow as it is being heated.

Put in a booster pump to feed the hot water tank say 1.5 bar but they tend to need 0.6 ltrs/min flow from the tap to start up and the flow from the mi xer is nowhere near that.

A solution from the panel.

Comments please.

Reply to
Drumtochty
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Use the correct type of mixer that is largely independent of pressure. Essentially two taps and mixer tube.

Reply to
Bob Minchin

it in the mother inlaws kitchen ground floor flat.

about 2 bar happy days it has lots of pressure.

hot water tank is beside the kitchen with the storage tank 10mm above the hot water cylinder so the pressure must be about 0.05 bar. The hoses to the monoblock have little non return valve.

he bathrom which has old fashioned taps the hot water would fill a glass in say 15 seconds so litte pressure.

p feed that is 15mm. I assume again very little flow as it is being heated.

d to need 0.6 ltrs/min flow from the tap to start up and the flow from the mixer is nowhere near that.

Agreed Bob and I should have checked before fitting and said it would not w ork but the sink is also a monoblock type sink. I do not want to redo the w hole thing. I am wondering if there is any way to use it as the mother in law likes the tap.

Reply to
Drumtochty

Depends on how much you/she is prepared to spend.

The cheapest solution is probably to replace the tap with one which doesn't mind the pressure imbalance.

If you've got a few bob to spare you could put a Quooker boiling water heater under the sink. That holds 7 litres of super-heated water, and feeds hot water to the hot tap at mains pressure via a blending valve which blends boiling with cold to produce hot. The 7 litre container is a stainless steel vacuum flask which has very low (claimed) heat losses, and incoming cold water gets heated quite quickly by a 3kW heater after you have used some hot.

It also enables you to have a separate boiling water tap which can provide instant boiling water for tea or coffee, doing away with the need for a kettle.

We've had one for a couple of years and are very pleased with it. In our case the motivation was that the new kitchen is a very long way from the hot cylinder in the airing cupboard, so we had to run the tap for a long time to get hot water. Now, it comes straight away.

Reply to
Roger Mills

Only works with soft water.

Reply to
Capitol

All was going great until I finished the lot. Cold water is from mains at about 2 bar happy days it has lots of pressure.

New the problem, the mixer tap needs 0.5 bar, did not notice that and the hot water tank is beside the kitchen with the storage tank 10mm above the hot water cylinder so the pressure must be about 0.05 bar. The hoses to the monoblock have little non return valve.

There is just a drip coming out the mixer when the hot is turned on. In the bathrom which has old fashioned taps the hot water would fill a glass in say

15 seconds so litte pressure.

She has an elctric shower so does not need hot water for that.

Options for the mixer tap comments please.

Put a 3kw instant heater in the cupbord below the sink fed by the cold tap feed that is 15mm. I assume again very little flow as it is being heated.

Put in a booster pump to feed the hot water tank say 1.5 bar but they tend to need 0.6 ltrs/min flow from the tap to start up and the flow from the mixer is nowhere near that.

With pressure so low, I don't think any mixer tap will work, most have only

10 or 12mm pipe. Also they need water pressures (H&C) to be comparitble.

I think you'll need saparate conventional taps & even with 15mm pipe it will be slow.

Reply to
harryagain

A lot less to go wrong with a gravity system. And often a faster bath fill.

Reply to
harryagain

Why do you lot persist with gravity tanks? almost no one does here except for existing ones Or if you live where there is no town water

Reply to
F Murtz

My last house was converted from gravity to direct when we installed central heating with a combi boiler. Big mistake! Slow filling bath, poor shower, condensation on cisterns and no stored water when we had supply cuts.

Current house has a loft tank that supplies a big hot water cylinder and toilet cisterns. Fast filling bath, no condensation on cisterns, and limited supply for flushing when water supply is cut. Plus back to a pumped shower gives fantastic showers. I actually re-installed the pump that we had to take out of the last house when the combi went in!

Mike

Reply to
Muddymike

Guy's I understand I should have checked before fitting but that is water u nder the bridge, the lady is 89 and wants that tap to work.

I have a direct system at home and do not use a combi boiler and it fills a bath or does a great shower. The guy who wants to fill a bath needs a norm al boiler and an unvented hot water cylinder. Not a combi as they only flow about 7 litres a minute my system does 15 litres a minute

At the moment an undersink water heater for the kitchen sink will be accept able to the lady and she is the person to be made happy.

Any other commenst re a booster pump.

As always thanks for any suggestions.

Reply to
Drumtochty

it in the mother inlaws kitchen ground floor flat.

about 2 bar happy days it has lots of pressure.

hot water tank is beside the kitchen with the storage tank 10mm above the hot water cylinder so the pressure must be about 0.05 bar. The hoses to the monoblock have little non return valve.

he bathrom which has old fashioned taps the hot water would fill a glass in say 15 seconds so litte pressure.

p feed that is 15mm. I assume again very little flow as it is being heated.

d to need 0.6 ltrs/min flow from the tap to start up and the flow from the mixer is nowhere near that.

Just off the phone to Stewart Turner Pumps.

The have a single impellor version of the Monsoon that has a little pressur e vessel that starts the pump and can be easily primed buy just flowing the hose ito a bucket and then closing the isolating valve. That keeps the pre sure vessel charged.

In the case of this installation turning on the normal hot tap in the bathr oom will have the same effect. Therefore she will get 1.5 to 2 bar at the k itchen mixer, that is similar to the cold supply.

Easily fitted in these circumstances.

Again thanks for comments.

Reply to
Drumtochty

Well, our water is hard and our Quooker's still working . . .

Reply to
Roger Mills

Have you considered an under-sink heater? One that has a reservoir of 10 litres or so?

They are generally well insulated and give you instant hot water, and are sufficient to fill a sink.

The only faff is a power supply, a non return valve and some require an over pressure valve.

I have one, and its 1/2 second before I get hot water at a temperature of my choice.

Reply to
Fredxxx

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