Hi had my eko burning for 5 days now, the problem Im having is I sometimes get black water at the bottom of my chimney I have a new chimney and the boiler is hooked up with 1 length of 8'black smoke pipe with 2 elbows .I know that its recommended to have insulated metal chimney but Im a mason so that was out of the question. zennon suggests insulating the black smoke pipe .Any comments on what to use for insulation,or if this will work?