I installed the Inferno heater a couple weeks ago. I would give them an A+ for service as I had a question on install. I sent an email Sunday afternoon and within minutes received the information I needed to complete the installation.
the heater produces a lot of heat when the machine is under a load and warm when idling after it warms up. It keeps my windshield defrosted. I really wish I could find some decent doors to hold the heat in but I guess I can deal with it.