Update!
I had to change the circulating pump for the hot water because the cast one was rusting and discoloring the water, so I installed this one from homedepot.
http://www.homedepot.ca/webapp/wcs/stores/servlet/SearchView?catalogId=10051&storeId=10051&langId=-15&N=0&Ntt=hot water recirculating pump&Nty=1&D=hot water recirculating pump&Ntx=mode matchallpartial&Dx=mode matchallpartial&s=true
Unfortunately it only comes as a kit so I got a bunch of stuff I didn't need,
also I removed the timer and wired it direct with a power cord and plugged it into my Apex.
The coil is over sized for my system which is about 200 gals total, which is located in the basement where it is relatively cool, the coil could have probably been half the size.
My current average went from 4.8 amps with heaters to .01 amps with the pump, there was no appreciable change in our gas bill but our hydro bill was @ $40 lower than the same period last year and the only thing different is the elimination of the electric heaters.
The total cost to build was under $300 and could have been less if I sourced the parts better but still it should pay for itself in less than a year. Wife is really happy to get a hydro bill under $200 and I am really pleased with the performance, I have one electric heater as backup set to turn on 1 degree below my normal setpoint but it has not turned on even once.
All in all I am very happy and wish I had done this a lot sooner.