I'll prolly get bashed for this but I have a harman tl300 for 5 yrs just had to replace combustion chamber but wouldn't change it for the world heats my 2600sq ft home like a champ no complaints here
Hi Jay , I'm also running a Harman TL300 and, oddly, I am also on my second firebox. This is a $3000 stove and I figured it would last more than a couple years. I got a "free" replacement stove that I had to pay $400 to get installed. Don't bother trying to email or text Harman directly because they don't respond to modern methods of communication. That being said, I like the stove, the massive ash bucket, the top loading option, the massive ash bucket...
It cranks out the heat, but when the temps drop below 10F (-12C) the Harman can't keep up. The oil furnace will then help heat my 2200 sq ft abode.