I should let you know that I purchased an Aerotherm heater almost 10 years ago and have used it every winter since and it has worked flawlessly, until today, but after 10 years of continuous winter operation, what more can you expect. I live in Northwest Wyoming where the temperatures are often below zero for several days at a time during the winter. I fly 150+ hours a year, so it is important to me to keep my airplane in top shape. I have never had to worry about starting my plane in less than desirable conditions. Your heater always kept my engine nice and warm, even in below zero temps.
Anyway, just wanted to let you know that I never even considered another product after the great experience I have had with Aerotherm.