Let do some easy mat.
Load is 2.2 KW. 220 heater uses 10A (220X10 = 2200 W = 2.2 KW) 110 heaters use 22A (10X22 = 2200 W = 2.2 KW). Electricity companies charge per Kilowatt, so, theoretically, you pay the same.
You pay for the energy you use, and that is measured in kilowatt-hours. So if you have a 2 kW heater it doesn't matter about the voltage - provided the heater is run at its correct voltage as marked on the rear plate. A 2 kW heater uses 2 units (kilowatt-hours) for each hour it is switched on, which costs about £0.30 or $0.30.
While tankless water heaters are significantly more efficient than traditional water heaters, it can take up to 22 years to break even on the cost, due to the initial expense of the tankless water heater itself. Unfortunately, by the time the tankless water heater starts to pay for itself, it will likely have exceeded its 20-year lifespan. http://www.consumerreports.org/cro/appliances/heating-cooling-and-air/water-heaters/tankless-water-heaters/overview/tankless-water-heaters-ov.htm
To answer this question a total wattage of the heaters and the cost per kilowatt hour must be stated. The cost per kilowatt hour can be obtained from your Ontario Hydro bill. Multiply the total wattage by the length of time in hours that the heaters are in operation. This will give you the cost of operation of the heaters.
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