Erik,
When I took delivery of the first
Vortex I had trouble with the belt tension. The three belts all had different tension meaning that the drive pulleys were not lined up. When the belts got wet they would slip when you tried to engage the PTO. The other problem that we found was that the seals in the blower had been eroded by fine dirt that had gone past the filters. The seals were letting the synthetic blower oil pass to the impellers which would cause dirt to stick to the lobes. The lobes would then begin to knock against each other causing the blower to fail.
When we installed the new cradles, rebuilt and leveled the blower it solved the belt tension and slippage issues.
As far as the heat, the 7000 Series has a addition heat exchange on the blower. Between the 240 Gallon of preheated water the heat exchange on the blower, and the Zentherm we can usually have 240 Degree water in 5 Minutes.