In Contract for a Duplex I plan to occupy

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Hello everyone, I just wanted to share my numbers on the duplex I'm buying and ask a little advice about separating OIL HEAT.    

Purchase price: 158K 20% Down Conventional Financing @ 4% I have my PITI at about $1200 per month. One tenant occupies a unit at $900 per month (no lease, that's a whole other issue). There is an above ground large mostly finished, heated and plumbed (is that a word) basement that I plan to finish and occupy. I quickly plan to turn the duplex into a triplex, every zoning indication is leaning toward this not being a problem. There's already 3 electric meters and a separate septic tank for this basement. The owner died before he could finish it.

I estimate 40-50K to finish the 2 bedroom basement. I plan to live downstairs and rent the two units upstairs and live for free downstairs. I'm really excited about all my numbers all the way around except: I pay for oil heating and the hot water. I will eventually switch to 3 separate electric hot water heaters but how about Oil?   

Is there any way to legally make the tenants pay for heat in this situation?  I'm just looking for some basic ideas from anyone who's been through something similar.  Natural Gas is not available.

I'm estimating this monthly heating expense at $400 per month. 

Also, I'm currently renting.  I'd want this house even if I couldn't finish the basement and I'd keep the property a duplex.