What year did HHT come out with the upgraded burnpot for this stove? I had one installed in 2009 in one of my stoves. I have another MT Vernon I purchased in April 2009, with a manufacture date of January 2009.Does this stove have the upgrade in it or not?Reason I ask is,the newer stove goes through 1 ignitor a year.the older stove has the ignitor that was installed with the upgrade 2 yrs ago.The dealer says the newer stove has the upgrade in it.