I received the heater much faster than expected. That was awesome. When I picked the box up off the driveway I heard stuff rattling around inside and thought "Oh here we go". To my surprise everything was there and actually packaged better that it sounded. The metal mounting plate would not fit over the fuel inlet and the studs at the same time. I drilled the plate holes a bit bigger and gently tweaked the fuel inlet as it was way to close to the air inlet. OK, now we're getting somewhere. I bench tested the unit. It took many start up cycles to get fuel to the pump and then the heater. There are no demonstrations on the digital controller on YouTube, so I would just turn it on, let the pump run until it timed out and disconnect from battery. I repeated this until it fired. The controller is confusing, but it can (sort of) be figured out. Once the unit is running it works AWESOME! I gave it 4 stars because it does work and at a fraction of the name brands. Otherwise I would give it like 2 stars at most, due to the lack of instructions.