"Mick." wrote in message
om...
Hi thanks for answering,
It is round not square but does look Similar All I can see written on it
is:
Harton Heating Appliances Ltd, Hatley Road, Thamesmead, Erith Kent.
I cannot see a model no anywhere on it.

I have had a look at the Harton web
site.http://www.hartons.co.uk/boostedhotcoldunits.html

It looks like you have a system 4 or 5 in which case it looks as though you
would not have a problem using the type of shower you have in mind.