No hot water pressure in the kitchen

[netherfield]

Mum in laws bungalow,very little hot water coming from the kithen tap,fed from a cylinder only 2 foot higher than the tap.
This is a new sink and tap fitted 3 months ago,this chaps phone as now gone dead so we can't contact him anymore,there was no problem with old setup,2 seperate pillar taps,now it's a monobloc mixer type.
Service valve is full open and is original from before,tap is connected via flexi pipes from tap to service valves,these pipes look good no kinks or damage to be seen and hot water at the bathroom tap is no problem.

Could it be that this is a high pressure tap and therefore not letting enough through.

I've read there are high and low pressure taps,but what is high and what is low and how do I find out what he pressure is.

If this is the problem can anyone recommend a suitable tap.

[Trevelyan]

netherfield said:

Could it be that this is a high pressure tap and therefore not letting enough through.

If it's been like this since it was installed then almost definitely this is the problem.

netherfield said:

I've read there are high and low pressure taps,but what is high and what is low and how do I find out what he pressure is.

A high pressure tap is basically meant for mains pressure hot water, a megaflow or combi boiler system for example. Low pressure would normally be a conventional system with the hot water coming from a storage cylinder (gravity fed).

[rovermorris999]

The old tap probably had 15mm pipe right to the tap. Your new monoblock will have a 10mm tail which will restrict the flow somewhat.

[Ferg]

netherfield said:

If this is the problem can anyone recommend a suitable tap.

Certainly sounds like the tap is not giving enough flow. Monoblocs are very restrictive. You might be lucky and the isolator could be causing a problem. You could take it off and throw it over a hedge, they are a waste of time any way. Equally the fitting on the top of the cylinder may be scaled up.

[netherfield]

Ferg said:

netherfield said:

If this is the problem can anyone recommend a suitable tap.

Certainly sounds like the tap is not giving enough flow. Monoblocs are very restrictive. You might be lucky and the isolator could be causing a problem. You could take it off and throw it over a hedge, they are a waste of time any way. Equally the fitting on the top of the cylinder may be scaled up.

I was hoping the fact the bathroom tap works O.K. would negate any cylinder problems.And we are in West Yorkshire,very soft water rarely see any kind of scale.
Also looking at the flexi pipes I imagine they are no more the 10mm as well.

[Ferg]

netherfield said:

Ferg said:

netherfield said:

If this is the problem can anyone recommend a suitable tap.

Certainly sounds like the tap is not giving enough flow. Monoblocs are very restrictive. You might be lucky and the isolator could be causing a problem. You could take it off and throw it over a hedge, they are a waste of time any way. Equally the fitting on the top of the cylinder may be scaled up.

I was hoping the fact the bathroom tap works O.K. would negate any cylinder problems.And we are in West Yorkshire,very soft water rarely see any kind of scale.
Also looking at the flexi pipes I imagine they are no more the 10mm as well.

Flexi-pipes are rubbish, frankly. I simply wouldn't fit a tap that had them, especially on hot water! You can buy the copper tails to replace flexi-pipes from some plumbers merchants, but the very fact it's a monobloc could be your undoing.

[Ricky_M]

These taps are not designed for gravity fed systems. The bore on the pipes going into the tap is minimal, so with low pressure water the flow will be dreadful.

[Simpo Two]

Two feet = 0.07 bar (I think). The bloke who fitted it should have told you it wouldn't work.

[netherfield]

Simpo Two said:

Two feet = 0.07 bar (I think). The bloke who fitted it should have told you it wouldn't work.

Having tracked down the tap makers specs on the web,it needs 0.3 Bar minimum.

[Ricky_M]

1 metre head is 0.1 bar. Calculate the distance from the bottom of the header tank to the top of the tap, this will give you your pressure.

[Skyedriver]

Similar prob,
Just installed a new bath/tap set up along with a new hot water cylinder in the kitchen and a cold water tank in the loft (bungalow so cold tank about 9 foot above tap outlet.
Cold water presure off mains is fine but hot water takes foreever to fill the bath. Thinking about trying to raise the cold tank in the loft a bit higher

[rovermorris999]

Taps that only need 0.1 bar are easily available. Pop 'low pressure monobloc taps' into google.

[netherfield]

I want a no pressure monobloc.