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Moreso Wood Stove Problem

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I have a Moreso 7110, flue set-up out of top, 6" single wall into insulated stainless chimney that transitions through wall outside to stand alone chimney (not masonry), ~17' in height. Stove serves as primary heat source in our yurt. So far this year we have been burning only ash, dry and seasoned.

Problem: Creosote is building up on the stove's ash pan door, pretty much all over in the ash chamber (below firebox). Particularly bad at the back of the ash pan chamber, almost seemingly climbing up into the firebox glazing the grate and appearing on the bottom of the vermiculite in the back of the firebox. Also, with the door open during a burn (which Moreso advises against), however, unavoidable during reloading - small puffs of smoke stream out the rear of the stove in a rear 1 inch circular opening that lays within a cut-out in the back panel cover.

Remedies already attempted: All the gaskets replaced with proper 8mm door, ash pan door, and 5mm flue collar, and ensured the glass is snug and secure and it's gasket still good and not overly worn, etc. Dollar bill tested all of the replaced gaskets, good to go. Also, ensured to the best of my ability that the baffle plates and blanket are all seated properly. Chimney brushed, swept, cleaned from rain cap to stove collar. Emailed Moreso, they say there stoves burn clean, creosote, etc should never appear in such a way. That was the translated response I received back.

Nothing to date seems to have changed the situation. After changing the gaskets and giving the firebox grate and the ash pan compartment and even the darn pan itself a thorough cleaning, after another night or two of fires, all the creosote is back. With the door open for a moment or two during reload, the small subtle stream of smoke out of that back inch diameter cut-out persists.

What is going on?!!

This is my first go round with a Moreso stove. We de-facto bought it with another property and brought it to our yurt because are old wood-stove was some inexpensive Menards' sold unit. Using the Moreso in the yurt seemed like a no brainer for efficiency and ease of use. Hell the Menard's unit never gave us problems, cheap as it was.

Anyone have experience with a Moreso stove similar to this? Any chance someone has experienced a similar situation with any stove that is comparable?

I do really appreciate any and all insight, thank you.
Posts: 3748
Location: latitude 47 N.W. montana zone 6A
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Hi W;  Welcome to Permies!
Are you aware of rocket mass heaters?  One of them with a bench or bell would cure your creosote issue.
RMH's burn so hot that all particulates are gone. Creosote does not stand a chance.

Your current stove is acting like most wood hogs. Smolder and form creosote. A chimney fire just waiting to happen.

The only way to not form creosote, is to run your stove with small batches and leave it wide open... not practical with a box stove. Too hot then cold...

Pop on over to the RMH forum and read all about them... you might just be interested!
Posts: 1808
Location: Big Island, Hawaii (2300' elevation, 60" avg. annual rainfall, temp range 55-80 degrees F)
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I have a Morso Squirrel stove. So I'm not sure if my experiences relate to yours.

Due to EPA regulations, the lower air intake vent has to be sealed shut in order for this stove to be sold in the USA. (The air intake on my stove was spot welded shut.)  Supposedly this makes the stove burn cleaner. Perhaps that is true for a hot burning stove where the cast iron is already heated (or if you are burning good quality hardwoods), but starting a fire in a cold Morso with that lower air take shut plus using trash tree species, it is a bear to get going with a decent burn. You have to keep the door open. Then to get a clean burn, the fire often needs more air...thus a door slightly cracked open. Only after the stove is really hot will it burn well. But then, I often don't want the stove burning full tilt. So there's a problem with a dirty burn when not running full out.

To rectify the problem, I used a dremel to remove the spot welds, thus freeing the air intake valve. Then I had to replace the hardware with a different one because this intake was intended not to be used in the USA. So with a little effort, I made the air intake functional. The stove now burns just fine.

If you are seeing creosote, then you aren't getting a clean burn. I'd check to see if one of the air intakes was sealed or removed due to EPA demands. The stove is European, so it most likely burns just fine in Europe because they don't have to modify it.
Posts: 170
Location: Appalachian Foothills-Zone 7
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If the intake fix doesn't do the trick, you may just need more chimney.
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