Going on the 10th season for the same firebox. It hasn't been an issue. I have a close friend with a Summit of your vintage. They heat exclusively with wood and have not had this issue either and their chimney is on the short side, but their house is at about 900 ft. altitude.
More than likely the problem is not the stove, but the wood or weak draft. Some wood coals up a lot more than others. And even though the chimney height has been verified, sometimes local topography or chimney location mess with draft and requires additional height. As a test maybe try adding a temporary 3ft extension to the chimney and see if it makes a notable difference. If it does, make the extension proper with class A chimney pipe and bracing.
Can you describe the flue setup in detail from stove top to chimney cap? We may be able to help spot a problem area. Pictures are always welcome.
More than likely the problem is not the stove, but the wood or weak draft. Some wood coals up a lot more than others. And even though the chimney height has been verified, sometimes local topography or chimney location mess with draft and requires additional height. As a test maybe try adding a temporary 3ft extension to the chimney and see if it makes a notable difference. If it does, make the extension proper with class A chimney pipe and bracing.
Can you describe the flue setup in detail from stove top to chimney cap? We may be able to help spot a problem area. Pictures are always welcome.
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