"I had originally purchased the next step down model, the 35k BTU, this smaller model was a good heater, I never had a problem with it, but it didn't quite heat up my work space as much as I would have liked. I replaced it with this 30k - 55k BTU model and I must say for the small difference in price it was most definitely worth it, this model was built more sturdily, its adjustable front foot is very handy for directing the heat to were you need it most, I point it up when working on the engine of my car and tilt it down when working underneath the car. However the best feature is the adjustable BTU output, very handy!!
I have used this heater the last two winters, which here in Minnesota have been colder than average, with temps below zero more often than not. The work space I use this heater in is a hundred year old large two car garage, it is unattached has absolutely no insulation and is quite drafty. After running the heater on 50 - 55k BTU for about a half hour to 45 minutes my garage is comfortably warm and can be turned down to like 40k BTU or so to maintain a good temp. It could be -10 outside and with this heater I can be very comfortably working on my car in a t-shirt! I have recommended these forced air propane heaters to all my friends that have an unheated workshop, they are a great investment, far better than there kerosene counterpart!"
What is your level of technical expertise? Home Handyman