I've had the mixer valve in for six years and I do live in a hard water
area, so I guess that means that I need to strip down the mixer valve.
Thanks for your comments.
| > Recently my shower pressure has dropped. I thought perhaps that it was
| > to drop in mains pressure, but now realise that mains pressure can't be
| > cause because the cold is fed from the tank in the loft and the hot is
| > from the hot tank which is also fed from the tank in the loft. I also
| > wondered if it could have been a drop in atmospheric pressure, but as I
| > never heard of this affecting showers I have decided to discount this
| > unless of course anyone knows differently. The distance between the
| > of the cold tank in the loft and the shower head is one meter. I have a
| > thermostatic mixer valve which is designed to work with a head of water
| > one meter upwards. Before I take the valve to pieces, is there anything
| > I could do to determine the cause? Would increasing the height of the
| > in the cold tank work?
| Do you live in a hard water area? Even just slightly hard water will
| eventually deposit scale on the inside of the pipework. Any reduction in
| the internal bore of the pipes, especially to something skittish like a
| shower valve, will cause the symptoms you're getting.
| Try looking in the cold tank for scale build-up around the sides and on
| entry points to the outlet pipes, and if you do see some then all the
| are almost certainly being affected by it as well. If none is obvious,
| it's time to strip down the valve and look for loose, worn or dry head
| which is not allowing the valve to operate properly.
| It's never a bad idea to raise the head height of a water supply to a
| shower, but it doesn't just mean filling the tank any more than normal.
| means you have to lift the whole tank up higher. As you use the water
| the tank the level drops to a point where the float valve detects the drop
| and begins the filling process again. Adjusting the water level in the
| for a such a small increase in the actual valve detection point is not
| the trouble, and might also cause more problems in the future if the valve
| fails and the water begins to over-fill.
| How long is it since the valve was over-hauled? How often do you flush
| pipework out and clean the inside of the tap heads? Pretty regular
| maintenance is needed on all things, and it does help in catching problems
| before they become a nuisance.