3000+ sq foot house with Oil Boiler in garage

Hello,
I have a pretty big house with an oil boiler in the garage. I am looking to find a way to heat this house for less. Any and all suggestions would be appreciated. The garage is a two car attached. with no living space above it. Existing furnace has a stove pipe for lack of a better term that runs straight thru the roof. Boiler has 4 zones. One for each floor and one that goes to a hotwater storage tank. I am interested in a low maintenance system that will be less expensive than oil. Are there restrictions in CT that will not allow a coal or wood boiler to be placed in my garage? What are my options?
Thanks!
Moderator if appropriate please move post to get most amount of possible replies.

There are many users in CT, and they will chime in soon. Yes to the question. Local codes they may know, but you can ask a friendly fireman before asking the building dept.
We need the age of house, window and door updates, if any,
Insulation, if known. Chimney situation......
Your location in the state would be important. A general area is close enough.
Are you handy with your hands?

whistlenut wrote:There are many users in CT, and they will chime in soon. Yes to the question. Local codes they may know, but you can ask a friendly fireman before asking the building dept.
We need the age of house, window and door updates, if any,
Insulation, if known. Chimney situation......
Your location in the state would be important. A general area is close enough.
Are you handy with your hands?

House was built in 1982. Upper scale home. Original windows that appear to function and seal reasonably. Location Bristol. It appears that the builder did not spare expense. I would assume that house insulated as well as any upper scale home built in the area in the 80's. Yes I am handy with my hands and mechanically inclined.
Thanks!

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Here is a pic of my current Oil Boiler and hot water.

WOW mega gigantic pics! My computer nearly crashed trying to upload them .... and I can only see 2. You might want to upload directly to this site.

You notice the your boiler is up off the floor, this is probalby to satisfy some rules about flame at least 24" up from the floor in a garage. This becomes awkward with coal boilers gettign coal higher and so on. You need a separate combustion gas system, chiminy with ceramic liners is the best, I have one of those metalbestos stacks, with no problems, but I burn 24/7/365, if you don't the ash and water in the air will combine to eat the stainless. Not sure how you place is layed out, maybe block chiminy on back end of garage, red brick above roof line. To me these problems have variable solutions and take the most thinking, and signifigant money, the coal boiler system is just money, but even that can be helped with rebuilt units. I don't know much about power vents but they certinly are quick, but require maintenace.

The chimney pipe runs directly up and through the roof. What about replacing my present boiler with a Leisure Line WL-110?http://leisurelinestoves.com/Boiler_and_Furnace_Products.html