On 26/10/2010 19:38, jgharston wrote:
Grrr. This is why I prefer proper stored hot water systems...

My shower has a mira Discovery thermostatic mixer, one of
these: http://goo.gl/0n7g

Try as I might I can't actually get the hot water to be hot.
With the temperature control turned all the way to "hot" it
just runs tepid, I end up shivering when trying to have a
shower. Following the instructions I've turned the internal
temperature control adjuster within the green temperture hub,
I've ended up turning it so far the worm scren is starting to
poke out of the hub, yet it *STILL* runs cold.

Basin mixer tap runs nice and hot, kitchen mixer tap runs
nice and hot.

Any advice?

At the place I used to live I had 25 gallons of hot water
sat waiting for me instantly onstandby.

JGH

If the water is hot at the sink then it's not the boiler or the system.
It must be the shower mixer. I've had one of those showers and it was fine.
Has it ever worked?
Are the hot and cold supply fitted correctly?
Is there a blockage in the hot supply?
If you stop cold water reaching the shower does hot water come out?