Who services tankless (on demand) water heaters?

[Bullwinkle]

Ecotemp has a good parts and trouble shooting help here:

https://www.eccotemp.com/replacement-parts/

https://eccotemp.zendesk.com/home

scale - I would not think that would be an issue on catchment ......I have had to solder up a pin hole or two in the last 8 years on one of my ecotemps .....bad oem solder joint and low ph rainwater me thinks