6 flow 450 psi and still 210-220
Excellent news to hear Dave, I'm glad you got the service that you deserved.
You know, we've got mostly 4.8 engines on our fleet trucks, they run just fine, lots of heat, even when cleaning tile floors at 1000 psi.
The Vulcan post heater derives heat from the vacuum blower, higher RPM and load produces more blower heat of which the Vulcan post heat exchanger captures, it's free heat without any extra fuels, that's what our company likes to run. We've been running the Pro-1200 for years, and
Sapphire made a quantum leap when they upgraded the system after they purchased it from White Magic.
All in all, glad it's all resolved, you won't need any service on the machine for a very long time now! Best advice, get yourself a nice pair of mechanics gloves, you'll need them when the weather warms up, ha! Yeah, you can dial down the heat with a control switch on the console, but it's rare that any technician dials down.