In message .com, dp
writes
Hi,

I have just had a new worcester 25si greenstar boiler fitted and I am
keen to change my old electric shower for a mira excel. I have read
through the instructions for fitting he mira excel and there was a few
questions I have and wondered if someone could advise me.


snip

My questions are is the 25si fitted with an appropriate expansion
vessel? The instructions say it has one but I'm not sure if this is
purely for the central heating.


Pass, ring Bosch? maybe. I fitted an excel a few years ago in my old
house don't remember if it was a requirement then or if my boiler had
one.
Does the 25si's supply pressure exceed 5 bar

That depends on your mains pressure. We had to high a pressure in our
mains (in the summer) for the shower (symptoms are whistling from the
shower valve) that mostly seemed to be an issue with the cold supply

and if so how easy is a
drop tight pressure reducing valve to fit?

Easy enough, it just plumbs into the supply pipe to the shower with
compression connections.

The last question is is this a job for a diy plumber or would it be
better for a plumber to do it.

I installed our Excel with no problems - plastic pipe (Hep2O made the
rujn down the wall and under the shower tray easy.

--
Chris French