Leviticus....In the end I found for myself that diesel heat was just too expensive and during this research for alternatives to the standard Surburban forced air heat systems that burn through propane very fast on cold nights ...drive you crazy turning on/off all night and eat battery power that the Plat CAT was just an outstanding option as it uses very very little propane and battery power but functions quite well on those cold Montana nights. Mind you I still have the forced air Suburban in my Alaskan but only use it to quickly heat up the insides and then let the Plat Cat take over from there while turning off the Suburban the rest of the evening.
Here is quite possibly the finest description of an Alaskan buildout I have ever come across ...72 pages of excellent discussion of many different topics including heat:
https://www.expeditionportal.com/forum/threads/alaskan-camper-build-up.9502/
Cheers to your efforts. I'm happy to help with any information I have.