A furnace doesn't have to have a secondary burn chamber to get secondary combustion. I get it in my plain jane usstove 1500 wood/coal furnace. I heat a 2400 square foot victorian with 10 ft ceilings with 6 1/2 cords of wood a year. As far as a warranty, I dunno with my unit. Well I did replace the baffle and the grates after 25 years, guess thats not that bad. I understand that the yukons are a decent unit, but its not the only unit out there. In the future I will look into the 1950 hotblast by usstove, or the caddy by psg. They have been tested and have passed for epa certification. There are lots of options, but I see that the only unit in your eyes is a yukon. Maybe thats because you're an employee for the company. Sure some units are worse than others, but they all do the same thing. These threads make for some damn good advertising.
I can understand your positition.
I talk to people every day about what their units used to do...good and bad.
Ergo ....I've developed an opinion which is just that an opinion.
If your old Hot Blast has a reburn great...I was talking about all of those that don't.
As an employee I have been educated to a lot of things.
EPA 40/60 AAA is talking about stoves.
Furnaces are exempted from the standard.
The funny thing is if you talk to the testers they will all agree that there is no standard by which you test a furnace that really holds water.
There are too many varibles to get a baseline that all furnaces and stoves can fall into to get the same testing.
Elevation,flue quality,wood moisture content,length of flue just to name a few varibles.There are more. So really the testing is all over the board from 1 facillity to the next.
I agree something needs to be done about inefficient stove belching tons of smoke out into the air.
The state of Washington knows full well what a smokey stove can do multiplied out in many homes. This is why they pushed for this standard by EPA.
I did make mention of several attributes a good efficient furnace should have.
If other that you are looking at has these great,then your in the right ballpark.
Oh,Yukons are built with thicker steels and we have added 304 grade stainless where corrosion was happening.
Our multi fuels are built in a modular fashion so when the do fail you can rebuild them instead of buying a whole brand new one with a 30 year prorated warranty that we do stand behind.
Say what you want ...it's your opinion.
Do you have any responsibility to the customer....I do.
Just my 2 cents