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Question DetailsAsked on 12/1/2017

average price to switch from oil, hot water baseboard to natural gas with a cmbi boiler system

1800 sq ft home, removal of oil tank also

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1 Answer


Oil tank removal, for in-basement tank, commonly around $1000 assuming the filler tube is also removed and the hole in foundation closed up - generally BAD idea to leave the filler pipe in place not only because there have been all too many cases of oil delivery men "filling" a tank that is no longerthere, but also because buyers seeing tht on the inspection report have to assume possible soil contamination also - so best to get all the piping removed and any contaminated soil cleaned up at same time.

If outside tank, all the more important to get it ALL removed AND get a soil contamination certification report from licensed petroleum tank removal firm - certifying the tank and all associated piping has been removed and that the soil around them has been tested and meets state cleanup standards. (which can run from $1000 range, occasionally less, to hundreds of thousands depending on how much leakage and spillage there has been over the years - I have seen everything from about 10-20# soil removal right around the filler tube/cap, so over an estimated 20,000 gallons reaching several houses ove many decades, and costing $1/4 million to clean up to state acceptance.

When you say combi boiler system that means you intend to be still using the same baseboard heating loops, just combining domestic hot water and baseboard heating into one commonly 60-100 gallon tank (with much more complex piping for the different temperature domestic and baseboard loop demands) coming off one boiler (which is commonly the same or similar but slightly larger capacity sometimes to the one you would have had for the baseboard heating only).

Cost depends on:

availability of natural gas already / cost of new gas service installation (commonly $1000 range but can be as high as $5000+ in some areas for a new service),

available room for installation (usually no problem if boiler and water heater are currently side by side, though platform if required - like in a garage - usually needs to be beefed up for the larger hot water storage tank),

whether you are converting your existing boiler to natural gas or getting a brand new one,

whether flue will (if going with new gravity flue boiler) needs reduction in size with new liner because it will not only have one appliance rather than two on it,

etc - but the following links to previous similar and related questions with answers should go a long ways to answering your questions. One of the first decisions will be whether you go with standard or high efficiency boiler - can make a 50-100% difference in the installed boiler cost. And certainly, since you are (unless reusing existing boiler) likely looking at $5,000-10,000 range or possibly even more all told, you will want to develop a scope of work (maybe after first talking to a few HVAC vendors on-site about possibilities and after they take job info (but hold them off on bidding until you provide the definitive scope of work parameters like acceptable brands, efficiency wanted, standard efficiency gravity flue or high-efficiency condensing direct vented, total BTU rating, etc.).

Answered 2 years ago by LCD

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