High cold water pressure but very low hot water pressure

[PTW]

Just moved into a new house and whilst the cold water is very high pressure, so high I have adjusted it with the stop cock, the hot water just dribbles out from any outlet, upstairs or downstairs, so impossible to take a bath. I have checked the stop cock on the hot water tank and they are fully open. The shower is a power shower and it blast out but presumably this is due to the cold water pressure.

The house is newish c. 1980, the only other thing is that water is very hard, limescale hard.

The system is conventional central heating NOT a combi.

Any suggestions gratefully received

 

[croydoncorgi]

'Adjusting pressure' by closing a stopvalve DOES NOT WORK!!
Mostly, you will only achieve a pressure drop when there is a large flow of water past the valve. For a small flow or no flow at all, the pressure in the pipes will be same both sides of the valve.

If you really do have excessive pressure on the cold main (quite unusual) you would be better off with a proper pressure reducing valve. Then you will get water at a sensible pressure whatever the flowrate and you will not be forever replacing tap washers etc.

Low pressure on the hot taps (assume fed from a tank):

Is it really 'low pressure' or 'low flow'? Look first for valves left turned off! Otherwise, chances are you've got a partial blockage at the tank outlet (drowned rodent?) or somewhere in the plumbing between there and the tap(s). If the house has been empty for a while, with water off and tanks drained, look for an airlock (quick remedies involving shower mixers and washing machine connections elsewhere in this section).
In a hard water area,, for a problem affecting hot water only, the bottom of the hot water cylinder may be full of scale, preventing water from flowing in (not common).