Also keep in mind to max out the number of panels your roof lines will allow. The more panels the quicker the recovery from low temperatures.
We chose to have as many panels as would fit on any of our west facing slopes.
Once you have decided to go forward, another panel or two will be easy to accept ($$$).
Just a FYI, we also elected to have a gas back up heater which is very helpful in Dec/Jan/Feb.
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