I have a pel-pro pellet stove. My glass gets gray after 4 - 6 hour continious burn and after
12 hours usually is some shade of black.
Around 24 hr continious burn ,(approximately 3/4 bag of pellets consumed) it has a really black band of about 3 inchs wide from 1/2 ways up the grass to 3/4 ways up the glass.
I am running the stove with the primary air 1/3 open to 1/2 open to keep a bright & lively flame, almost a blow tourch flame, & to cut back on the sooting of the window. On a lower air setting,it soots up much more and much sooner.
I clean out the stove at the end of every bag because unburned pellets popcorn onto the ashes on the inside floor of the stove and then during shut down cycle, red glowing pellets may land/ popcorn out of the firepot & end up igniting the not burned pellets laying on the inside floor of the stove. These pellets will smolder all through even the longest shut down cycle & I sometimes end up with a burning pellet smell in the room & have to manually program in 3 or 4 shut down cycles, end to end , until these burning pellets on the inside floor of the stove stop smoldering.
It is quite agrevating & troublesome, to say the least & makes black glass seem like the least of my problems.
I anyone has any ideas about how to stop this or even a better way to deal with the on going problem, I am all ears.
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It is way inconvient to have to clean out the pellet stove more than once each day, because it is two hours without heat, On hour waiting for dead ashes & 1 hr cleaning, if I need to scrape the fire pot out with a puddy knife. If i only brush off the fire cup, i can clean in 30 minutes,
including a windex job on the black glass.
I use a 8 gal wet/dry vac with 1 .5 gal of water in the vac tank to help catch ashes & extinguish any live sparks and 3 vac filters in place simoustainiously; air filter type,foamtype & paper bag type. The paper bag stops any ashes that dont fall into the water & the foam & air cleaner filters protect the vac motor.