Looking at which one you thing will have the best cold weather performance. They are both premium brands. Will have a totally strait chimney 5’ double wall and 19’ of 2100(ULC-S629) hooked up to a Blaze King Princess (has cooler stack temps than other stoves). We normally get at least 5 months of 0F or lower in winter and 1-3 weeks of at least -40F, only seen -60f once. I have not been able to find an “R” value to any manufacturer’s chimney and the different construction could be misleading. Excel has a 1” wall but insulation butts together between joints. Duratech Premium has a 2” wall but every joint has metal conducting heat to the outside of the pipe. This makes me wonder if Excel is like a vacuum sealed thermas vs Duratech being like a regular thermas (vac. Sealed is much thinner but insulates better). Only other variable I see is Duratech has an insulated fire stop and attic radiation shield that Excel does not provide. Thoughts and experiences are appreciated.
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