Main are a UK based manufacturer of professional heating products and have been around for years. They are part of Baxi. There are still Nymph spares being listed online.
This small Nymph instant water heater was bought on eBay but I never got round to installing it in my camper van. It came originally from a boat and I have no reason to suspect it doesn't work
This is a great unit for supply to a kitchen sink for washing up or a quick shower (5 minutes continuous use is advised). The unit vents from the top so needs good ventilation like in a utility room.
Hopefully of use to someone doing a self-build boat or van conversation, which was originally my plan. Thank you for looking.
The width of the unit is 30cm. The height is 33cm, and the depth off the wall is 15cm. I'm sorry but there are no instructions but I note that Main Heating are still going and may have a copy on file.