In article ,
Tom writes:
Hi All,

I have just bought a Swirl thermostatic shower mixer that is to
replace a leaking AquaLisa recessed model.

The bar type are all (AFAIK) slow acting thermostats using
a phile.
Your recessed one may have been a fast acting one designed
for a multipoint heater or combi boiler (although they also
come in cheaper slow acting versions for stored hot water,
and completely non-thermostatic valves).
Might want to double check you have a suitable replacement before
fitting it - there are several types of thermostatic controls
for different situations (with a wide range of prices).

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]