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Single stage, two-stage and multi-stage, which one
This is a follow-up to the "Condensing Furnace" thread. I've been selling modulating heating since '91, and have done so very successfully, but it was with Rinnai's Wall Furnaces. Net to the space in other words. Tim's preference for single stage and his reasoning make sense in the scenario he describes, but what, on a clean sheet of paper design, would you prefer? On a retro-fit of 2 stage or Variable speed, what problems have you encountered and how did you fix them?