I second Airdog,had one of the very early Fass--became noisey after pulling the travel trailer for the first time,i think it was draining the fuel basket(150GPH model). Company i bought from took it back i paid the difference for the Airdog,smaller/very quiet,happy so far--had it or about 1-1/2 years. PS---- RASP just came out after i bought my Airdog or i would of looked at that too. DW