(Edit: Please also see the last post on the previous page for photos as installed.)
I think it must be this (or equivalent model from 5 or so years ago) https://www.gledhill.net/products/alternative-energy/stainlesslite-horizontal/:
I think it must be this (or equivalent model from 5 or so years ago) https://www.gledhill.net/products/alternative-energy/stainlesslite-horizontal/: