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Oil to Gas Conversion-- with additional questions
I moved into my home 6 years ago, which at the time had a 60-year old coal converted to oil boiler. After several winters of bleeding cash to pay for oil, I bit the bullet and replaced the boiler with a Burnham V8 boiler. At the time, we considered converting to gas, I ran numbers and figured oil still made sense. Sadly, I don't believe oil will ever be the price it once was, but have been beating my head against the wall on whether this makes sense, and of course everyone has different opinions. This is where I am at:1) In trying to do an apples to apples comparison I've run these numbers:I figure oil will be around $2.40/gallon this year (or worse given the recent trends). Figuring oil has 140,000 BTU's per gallon, I figure $17.14 for 1 million BTUs.We received a quote from the gas company for $.74 per CCF. Understanding that gas has 1000 BTUs per cubic foot, I calculate $7.40 for 1 million BTUs, or roughly 43% of the cost. So first, are my understandings correct and do those calculations make sense?2) Clearly a conversion is not an isolated project, and this is what I figure is included---Gas must be brought into the house-- the gas company has come out and bringing it from the curb will be free (we're within 50 feet)-We'll need to reline the chimney-- this is a bit of a wash as we have been told that our chimney needs to be relined sooner rather than later anyway. Are there any pros or cons to relining for gas over oil or is this a similar expense regardless of which way we go?-We need to pay for gas piping within the house. The boiler is very close to where the gas would enter the house, so I don't envision this being too bad, though we will be asking for taps for the DHW, dryer, and stove (all are "some day" items, I just would like to be prepared)- Of course we need to pay for the actual conversion of the boiler (assuming it's possible)3)Overall is there anything I am missing, or are my assumptions as to the entire project correct? This boiler is rated at 83% efficiency right now, is there anyway to calculate what the efficiency would be after conversion?I appreciate any insight.