when I turn on the hot water taps the pressure goes down to a trickle after
about 5-10 seconds (from full pressure when first turned on).
the cold taps have normal pressure, its just the hot taps.
a mate said that I need to change the valves in the taps but I'm thinking
why would both the hot water taps go at the same time? they were installed
there is a slight drip coming from the boiler but not enough to cause loss
of pressure on this scale.
any ideas anyone?
Every hot tap (I assume that you have more than one) or just one?
If all of them, depending on your system, you may have a stopcock
installed between the cold water tank in the loft and the hot water tank
in the airing cupboard. If that is /almost/ off - then you will get an
initial burst of water that soon goes to a trickle.
The tank in the loft can pressurize the system when there is no demand -
but as soon as there is demand, the pressure falls. So high pressure
initially, then low pressure.
If it is a single tap, then it looks to be that tap that needs fixing!
As a tap is not much more than a tube with a valve in it - changing the
valve will probably do the trick. But have a look see - changing the
washer would be cheaper.
If it is one of these quarter-turn ceramic jobbies, then you will need
to replace the cartridge - if you can get one for your tap.
Assuming that you do not have a combi boiler, then I suggest you look in the
loft or airing cupboard and check the HW tank. Is it full of water and when
you press the lever valve down does it fill up quickly.
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