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6" Boiler Exhaust w/ 5" chimney liner. how bad is this?
Last year I had a chimney company inspect all three flues in my triple flue chimney. They determined that the main flue which my oil boiler ties into had corroded and offset tiles. They reccomended dropping a stainless steel liner down the flue. I had them do the work and it ended uo costing $1600 for a 5' 40 foot ss liner.
The work was done last August. I live in New England in a 2300 sq foot colonial built in 1999. After the install I spent about $3500 on 950 gallons of oil to heat the home. This seemed kind of exhorbitant to me so I started looking into having a pellet boiler installed to save some money.
Long story short I will be getting the pellet boiler installed but in the process of preparing for this I had a different chimeny company come out to put in a liner for that boiler and while they were there they looked at the other liner which is a 5" and told me that it should have been at least a 6" because the oil boiler exhaust pipe is a 6"
So my question is how much efficiency am I losing by going from 6" on the boiler to a 5" liner up a 40 foot stack? Did I likely waste a lot of money this past winter on heating costs due to the chimeny company's not using the right size liner? How would you go about addressing this issue?