I wish I would have spent a few more dollars and got one with the newer control unit. The manual does not talk about this style of control unit and how to prime for the first time use or how to use the control unit. It’s not to hard to figure out though. With this unit I just turned it on and tan it through the first cycle til it gave me an error code for no fuel, turned it off and ran it again and it self primed the second attempt and ran good. I haven’t got it out to field test it but ran it off of my dual battery setup in my garage on a 25 degree day.During normal heating with the thermostat set to 85 degrees or so it was running at about three watts. Cool down it jumped to around 400 plus watts for 10 minutes or so till it cooled down. I forgot to check on start up but it didn’t seem to pull that much during initial start up.