Kurt and his assistant (Andy?) came to my house to troubleshoot our baseboard hotwater heating system. It's an old system, and overly complicated with four heating zones and extra plumbing a pipe-happy plumber must have installed, and was far from being straightforward. Both the guys worked and worked and worked, for close to 3 hrs, doing various things to pinpoint the issue. Think we got it figured out...thanks guys for your dedication and hard work!