I have had the wave3 for 4+ years. We travel, boondocks/dry camp almost 100% of the time. We do lots of winter trips... Humid or dry weather. I track the internal humidity v/s outside.... Even with the wave the inside is always lower than the outside and that is with the vent cracked open and a couple of windows open 1/2 in or so. It's really nice to have fresh air even in the dead of winter.
I have found that inside humidity is higher if I close the camper up, no windows/vents open and we stay in the camper all evening and night. Just us breathing.
I have 2 CO detectors... one has a PPM readout. Never has it registered even 1 PPM in all these years when using the Wave3. OH, if I do not open vents in the AM (summer or winter) when making coffee I will get a reading.... PPM... Think the highest I saw was 40....I forgot to open a vent.
Here's how I installed my Wave3:

Here's the link to my install!
http://www.rv.net/forum/index.cfm/fuseaction/thread/tid/23544764.cfm
http://www.rv.net/forum/index.cfm/fuseaction/thread/tid/23544764.cfmI will add this, a Buddy heater is not a Catalytic heater, it is a ceramic type heater.
Either the Platinum Catalytic or the wave is an excellent choice. Some of us can not install a Platnum Cat due to the need to vent it. It also relies on 12vdc to run... They both have their pluses.
A wave3 running on low, 1600btus are used each hour... There are 92,xxx BTU's in a gallon of propane.... You will use 1 gallon of propane in about 60hrs....
We run ours on low 99% of the time. The max Btu's for the Wave3 is 3000.
A Platinum cat can be controlled with a thermostat! Pretty cool. Read Sleepy's thread.
The Btu's are set at 3000 for the small unit and 5200 for the big one.
It is great to have the door open in 20 + deg weather and still be warm in the camper...
Radiant heat V/S blown hot air!
Jim