Poly - Thread Finder
The white smoke (fuel evaporating) comments are consistent to what I reported too.
As an aside.
As I have said before, I don't think that my Espar has ever worked since new. When the heater wouldn't fire I would get raw fuel out the exhaust just before shutdown. When I first got my heater firing reliably I didn't have the exhaust pipe connected. The heater would give a small amount of white smoke and then begin roaring a bit. There was no smoke once the main burner fired.
After operating a few times I connected the exhaust and set the REST timeout in motion. After a bit of warm-up the exhaust began billowing white smoke to the point that I was afraid that the neighbors might call the fire department. Fortunately it was quite windy so the smoke didn't linger much. I knew that the heater was firing smokeless without the muffler. The smoke was from all the fuel that was soaked into the muffler sound packing material. I saw no flame at the muffler so it was being evaporated off. The heater is now operating cleanly with no smoke. The exhaust system is fully connected.
I have been using the heater daily to assure it is OK. It is actually kinda nice to have it operating.