I am looking for reviews on the Elecro Nano heaters as I am ready to buy a 3kw for my pond, and hoping to install this weekend. I am also a little puzzled as there are two seemingly identical heaters, the Nano spa and the nano cygnet. The latter is aimed at aquatic use. Ive looked at the spec in fine detail and cant see any difference between them other than the sticker on the front and the price! They are both titanium and have same flow rates etc. Has anyone bought a non-aquatic specific nano?

I am also slightly concerned that the analog thermostat dial can go up to 40c, I don't want to poach the poor darlings!