Is Solar still cost efficient in Ontario?

[BigSplash]

Does this add up?

.75 Hp = .56kWh
@.80% efficiency = .45kWh
to run the pump for 8 hours at peak time is 0.45kWh * 10c * 8h = 36 cents?

Gas
79 to 86 =7F
1 BTU is required to raise 1 pound of water by 1F
lets assume 1 gallon weighs 8 pounds
To raise the temperature of 10,000 gallons of water by 7F requires
10,000 * 8 * 7 = 560 000 BTU

1 cubic meter of gas contains 36267 BTU and costs 20 cents.
assuming 80% efficiency, therefore 29000 BTU at 20 cents.
560,000/29,000=19.31 19.31*.2=$3.86

So to heat with gas will cost approx. $4 dollar, what my solar panels can do in 8 hours for 36 cents, does this add up?