My guess also! Has your cold tank a lid? Look inside before draining, it may
have accumulated gunge from years of dust in loft. One other thought---has
loft lagging or, on old lid fallen in ( made of Particle Board)? I've seen
both causes.
"John" wrote in message
...

"Peter Johnson" wrote in message
...
I have a Mira 88 shower which draws hot water from the main hw tank.
It has worked satisfactorily for several years until this morning,
when the only way I could get hot water out of it was by removing the
shower head and lowering it, which is ok for washing my feet but no
good for anything else. Doing this I can get a good flow of hot water
but it stops as soon as I put the shower head back on its bracket. I
have checked the hose and the shower head and they seem to be ok.
It seems to me that there is a reduction in pressure on the hot water
but I can't work out why. Any ideas? (The hw tank is on the first
floor, the same as the shower, so the rise is just a few feet into the
roof space.)
TIA

Is the cold water tank filling properly? Is there any foreign body in the
outlet in the bottom of the cold water (Header) tank?