Cold water higher pressure than the hot water?

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NKJKB

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Hi,
The water system in my whole house is affected by this, everytime I turn on the water from the tap which is a one hole tap mixer either its very cold or i have to turn the hot by itself and it get really hot, but if i add a little cold water it goes cold because the pressure is too much from the cold water.
Can anyone tell me what the real problem is, and if there is a cheap solution to this?
 
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what is the difference between a pressure reducing valve and a pressure equalising valve?
Also if i wanted to add a pump and thermostatic shower..how would these valves affect the whole system throughout and where should these valves be placed?

thanks for your useful info
 
place the presure reducing valve as close to the stop tap as possible (to do whole house) or just on the feed to a individual tap if you only wanted that one reducing

adding a pressure reducing valve on cold mains wont affect a shower pump, make sure you position the pump correctly though (check manufactures instructions) normally by the side of hot water tank is ideal place for them to prevent air being drawn in.
 
Assuming it is gravity hot and mains cold (which sounds very likely, i.e. tank in loft), then really you would need a one hole tap with a dual flow spout (not mixed in tap) or a low pressure mixer tap with non return valves on hot and cold feed. Most taps, unless they specifically say so, are high pressure for pressurised systems like combi etc.
unfortunately most of europe don't use gravity fed systems so a lot of taps (especially in B&Q) are high pressure.

Another fix would be to make the hot feed high pressure by using a whole house pump (should use a negative head pump for mixer) or changing to a pressurised system (unvented cylinder, heat store or combi).

All the options will cost money but the choice would depend on how many taps you would need to replace and whether you wanted to take advantage of the problem and get a power shower and quick filling bath at the same time (pump or pressurised system)

I should warn you I am not a plumber but my advice is still sound.
 
Obviously there were no replies before I started typing, but I still think these other options are valid and should do a better job, but a pressure reducing valve is certainly cheaper! especially if he wants the power shower anyway
 
g20 said:
adding a pressure reducing valve on cold mains wont affect a shower pump, make sure you position the pump correctly though (check manufactures instructions) normally by the side of hot water tank is ideal place for them to prevent air being drawn in.
Click to expand...

where has the shower pump all of a sudden come into it ?
 
NKJKB said:
Also if i wanted to add a pump and thermostatic shower..how would these valves affect the whole system throughout and where should these valves be placed?

thanks for your useful info
Click to expand...


here! :LOL:
 
Neber said:
Obviously there were no replies before I started typing, but I still think these other options are valid and should do a better job, but a pressure reducing valve is certainly cheaper! especially if he wants the power shower anyway
Click to expand...

they are valid if you don't mind spending £5000
 
i want to fit a pump and a mixer thermostatic shower and wanted to know how the pressure reducing valve would affect it and where should it be installed
 
they were just options and since when did a whole house system pump cost £5000, your clearly a plumber.
 
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