Thanks Davy
Warranty is probably out since although new/boxed to us, it wasn't actually 'new' - it had been bought but not opened almost a year previously. The guy who installed it at one stage said he might buy it back off us but hasn't and looks like he has gone off the idea now.
Just checked the model: Triton AS2000XT - any good?
Yeah, makes sense obviously just to sell it but that means disconnecting it - wouldn't really be happy about doing this TBH. Or maybe I shouldn't be too worried? I only mentioned selling it to the installer of the new shower since he would have to disconnect it himself then.
OK, maybe slight change of question then; any idea how much I should ask for this (if I manage to remove it that is) ?