I am pretty sure its one of the cheapo Chinese shower towers that came in around 10ish years ago , absolute ***** , like everything from over there .
Good luck
A bit of Googling reveals the name "Artena" on the front turns out to be an Italian company.
OK, so it may be made in China.
Tim's photo I think shows an older model than those illustrated in the Artena technical info. (copy here - this website nothing to do with them!) Schede tecniche - https://en.calameo.com/read/00184143024316820529a
Looks like they are out of business or swallowed up by another company. (There are Artena radiators, maybe a different co.)
From the tech info. above, their details were:
ARTENA HYDRO S.r.l.
Via Tolmezo 13 - Z.I. Ponte Rosso
33078 San Vito al Tagliamento (PN)
I'm not putting the website link as it's no longer valid for that company