I have operated the Boxxer 421 for over 7 years now. It is plenty powerful and produces plenty of heat and vacuum. I get decent drying times with it and over all it has been a very decent machine. The main thing I have to say about it is that it has been reliable for me. I've had very few repairs in the last 7 years with very low maintenance cost. There are two parts on the Boxxer 421 that have caused me some problems, but both are not really expensive or difficult to replace. Those two parts are the thermal relief valve and the high pressure solenoid which is mounted on the recovery tank. You might want to keep a spare on hand of these two parts or put a new one on annually to avoid problems. If you are not already planning to do so be sure to get a water softener. Hydramaster can void your warranty if you don't use one and even if they didn't I would still highly recommend you get one. Hard water is the arch enemy of heat exchange truck mounts!!!!!!!!!! I think you will like the Boxxer 421 so don't be worried about it. There are lots of them out there with many satisfied users.
The only other truck mount I've owned that was powered by gas engine was the Century Avenger 210. I don't think they make it anymore. Mine was a lemon with frequent and multiple problems. I finally gave up on it after 3 years and sold it and bought my Boxxer. That was one of the best decisions I've ever made.





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