is there any way of ajusting the water temp on bristan pisa thermo shower?

check if flowlimiter is fitted in cold side of supply,see instruction book.contact bristan,they can supply it. if that fails,fit a flow restriction valve to cold supply .

m w s
January 2009

Mine is the same. It has become progressively harder and harder to turn on. About 3+ years ago the same thing happened and in spite of the advice to soak the whole cartridge unit in vinegar and water overnight, it would not unstick and I ended up having to buy a new cartridge.
I suspect I am going to have to buy another one quite soon.

Jane
January 2009