I had my original furnace and th current water tank replaced about 5 years ago through direct energy.
They had a promotion that allowed me to pay off the bill over a year interest free if I did both. Only really needed the furnace but upgraded both at the same time.
Installer used the existing exhaust pipe for the water heater but had to add two (2) PVC pipes for the furnace. 1 combustion air inlet, 1 exhaust.
Total cost for both was about 5 k I think. Don't quote me thoug as it was 5 years ago and I'm getting old.
I would check to see if enmax / your provider has a similar program.
For my case the guy was in and out in a day. Took all the crap with him when he left.
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