Maybe? Just look on ebay and exclude the high dollar name brand stuff.Do they make engine coolant heaters/circulators as well (aka engine block heaters)?
The cryptic keypad
I set this thing up for more testing in my living room, venting up the chimney. It seems to be drafting (the exhaust is hot as hell so I'd hope so), and in doing this fiddled with the thermostat. I was hoping it had a low fan setting that I could force, but that's not the case. As it nears its target temperature it throttles itself down and gets 90% quieter...
I actually think I like this more because when I'm camping this thing will be whisper quiet maintaining a reasonable temperature inside an 8 foot box pop up camper.