oil-based furnaces consumption

I'm interested in some info from people that live in cold climates and have oil based (water baseboard) furnaces for heating.
how much does your furnace use per year? how cold does it get (and for how long), how big is the house and is it well insulated?
I'm trying to figure out if it's really worth it to replace a furnace (after following the "should I replace a 9 y/o furnace" thread). We live in a 50 year old duplex (900 sq ft floor times 2 floors, plus basement and garage) where the walls aren't well insulated and the windows were bad (we changed the windows but I can't say if we'll use less fuel yet, winter's just beginning). It gets really cold in winter (-20, -30 celsius is common) for a long period of time. the furnace is an old iron tank and it's feeding about 18 baseboard heaters around the house.
the hot water tank (common to the whole house, so serving 2 families) is also running on the same oil as the furnace (from same fuel tank)
for the whole year we go through maybe 8000 liters of oil.
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I live in 75 years 1500 sq. ft two story house in WI. The boiler is cast iron "Ideal American Sectional Boiler" or something like that, originally built to burn coal or wood, with retrofitted oil burner. Don't know how old the burner is, but the oil pump had been replaced in 1965. The house has separate gas hot water tank. I used about 800 gal. of oil last season. The windows are original 75 years old sash with newer aluminum storm screens. The walls are insulated as good as they insulated them back in 1928 and I also have a layer or R19 additional insulation in the attic. The windows on the first floor have "honey comb" blinds, which I think have a small R factor, about 1 or so.
JJ - if you live in Canada, you should have an idea how cold it gets in Wisconsin.

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What was the cost of the fuel oil. How many people live there, Do you know what was consumed in the summer months ,without heat running. Im trying to see what you use in the winter. minus water heating, and cooking.
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something like 40 or 50 cents (canadian) a liter.

downstairs, family of four upstairs family of 5 with 3 small children, mother used to was daily with hot water.
Do you

I dunno, less than a tank. how big is a big tank of oil? about 900 liters? either 600 or 900, I'm not sure.
but the thing is that during winter the people upstairs washed every day, several loads, with hot water. not the best tenants around. now they're gone and we're putting insulation in the walls and ceiling upstairs. we'll see how much we use this winter.
Im

cooking is electric.
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Does the boiler, (you have a boiler, not a furnace!), have a rating plate on it? That will give you its efficiancy. I was surprised when I looked at my father-in-laws boiler a while back. It was rated for something around 190,000 BTU in, 95,000 BTU out, in other words, 50% efficiancy. Yours may be simular. It is pretty easy to get 80% efficiancy in a oil unit. The differance is with the 50% unit, 50 cents of every dollar is going up the chimney, with a 80% unit, only 20 cents is wasted. Your savings could add up quickly. Also often oil burners are oversized greatly, we often remove oil boilers and furances and put in units 1/2 the output of the old one! We did a change out the other day where they had a 140,000 BTU oil first, then years ago went to a 100,000 gas unit. We removed that and installed a 60,000 BTU 90% gas unit. Check around, get some refrences, talk to some pros, and get some quotes! Greg
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If you have baseboard water heat you have a boiler not a furnace . Some areas of canada and US have electric costs comparable to oil or gas . I pay .125 KWH which is double the cost of NG. If you are paying more than .06 kwh gas would be better for cooking. Only heat water so you shower without adding cold. No reason to waiste money heating it more. Reduce water flow with reducing inserts. Insulate Hot water pipes with foam slip on pipe insulation , the one that the seams have glue on them. I have a tankless water heater, hot water for shower and laundry and gas cooking cost me 8$ US a month per person. Figuring yours is hard , because you have a tank. I cant figure your heating usage but your unit may not even be 50% efficent. If you figure the numbers im sure you will see a 4 to 5 yr payback. A good investment.
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