After reading so many threads, some maybe to old to matter anymore, I'm still having trouble with what to purchase. I was looking at the vapor fire 100 for my purchase but I keep wondering if the new tundra 2 would be just fine for my needs and I would save a couple thousand dollars. What are the main differences here? Just more automation with the vf100? Yes I know I am comparing a Camery to a Cadillac. Burn time is a big consideration for me as I work from 7-5 in the winter, I would really hate coming home to a cold house everyday and have to relight the furnace. The vf100 says 12 hour burn times and the tundra says only 8 hour. Looking for some real world people to tell me what they are really getting for burn times. I was looking at the Heatpro for the larger firebox so I could get the longer burn time, but my home is only 1800 square feet so I thought it would be too much furnace for my house. Thoughts on this? Would I be running this furnace to low perhaps? Also there really is only a 2k difference between the vf100 and the Heatpro, so not as much savings from the tundra 2. Doing this all from stratch all I have to far is the wood cut and stacked waiting for next winter, any input is greatly appreciated! Home info: 1800 sq/ft, 2 story home. Furnace will be in basement (not counted in sq/ft number). Newer built so good insulation. Northern Michigan location.