Starting to dislike my Enviro M55 cast

i have found in a lot of cases the "squirrel cage" can be adjusted to fix this. it has a allen head set screw losing it and sliding the cadge left or right just a hair and retightening might make it go away

Constant maintenance is the fact of ownership with any biofuel stove or boiler. Live with it or go back to conventional heating.

sure it is. they are all considered consumable items. Frequency of replacement depends entirely on hours of usage, frequency of cleaning and the atmosphere the interior mechanical parts run in, in other words, ther more hostile the enviroment, the shorter the lifespan. It's hot and dusty inside the cabinet, not an enviroment conducive to long mechanical life.....

Won't matter what you get. You'll be replacing mechanical parts on any make.