I don't recommend hydro heating to anyone in Ontario. Ontario is moving towards Time of Use (TOU) billing in the very near future. Many areas are already on TOU (parts of Toronto, for example). Heating with hydro during peak hours will become very costly.
Have you considered installed a wood air tight stove? This may be a good solution in conjunction with propane.
a) Google < ground source heatpump coefficient of performance>.
b) Hydro on TOU is cheapest at night*, when the heating load is the greatest - it should balance out
*Lower than the RPP price of 6.4 cents per kwh + delivery
WARNING: The HVAC information I provide is not based on field experience and DOES NOT constitute professional advice.