@John Newman,
There is no natural gas available in the area, but propane would be an option (provided I wanted to install lines and tanks). Electricity is split out by tenant, but domestic water is not. The main concern for me right now is the heat, although I could potentially meter the domestic water usage as well, but it would be more difficult due to the way the water lines are installed.
The heating system is relatively new, with the boiler being somewhere around 10 years old. It's been serviced recently, and the service tag shows it's a yearly occurance. I could add two boilers, additional fuel tanks and split things up that way, however the cost to implement that would be somewhere around $8,000, while metering the heating will cost me about $1,500 and a day of my time.
@Troy Zsofka I agree there's some balance to be had when it comes to utility costs, but I think people could view it as an opportunity to lower their costs. If I reduce rent by $75 a unit per month, while reducing costs by $100 per unit per month, human nature would be to do everything they can to keep their heating costs below that $75 that I just put back into their pocket. The other piece here is that I become less concerned with fuel costs when it comes to setting rent, so if fuel costs do increase, the tenant can elect to turn their thermostat down, take shorter showers, etc to defray the costs (much like when I tell my wife to go grab a sweatshirt in the middle of January, versus turning the heat up to 70).