Had problems with both Eapar hydronic and airtronic systems in our 2007 SMB.
Found Thermo King in Denver, an authorized Espar service center. Not cheap, but excellent diagnostics and repair work. With fall already here in the Rockies greatful to have heat again.
I also found them online. Just got home with my sprinter, and was wondering who can work on these. It's already getting a workout up here in Silverthorne. Nice to know they've seen a Sportsmobile before. I'm sure I'll be visiting at some point with my D5.