Hi there,
We are the dealer for Planar Diesel heaters. They are 100% designed and manufactured in Russia, NOT China! Fully complient with North American laws. Planar offers a superb customer service, 2 year warranty and spare part support, the chinese not so much...
The reason we became a dealer for them was the fact that the russians are famous for building automotive components that either last forever or can be fixed with basic tools. For example: the european heaters need a code reader and service tech if they stop working. With the Planar you need some basic tools and be able to read the "code" from the LED blinking light. They are very easy to trouble shoot.
The second big point was the price... At half of the competition it's a pretty good deal.
Altitude compensation:
Usually these type of heaters need a pricey and complicated accessory kit to compensate for high altitudes. The planar works perfect in 10.000ft elevation as I tested first hand for several weeks this spring. You could further increase that number by using kerosene as fuel. This would give you more efficiency and a cleaner burn.
In any case, thanks to the original poster for starting this conversation.