I tried to buy the Thermal Arc 185TSW from my local Thermal Arc dealer
in Winnipeg but he was unable to get one because it does not have CSA
approval. I ended up ordering it from the Indiana Oxygen Company
http://www.weldingsuppliesfromioc.com for US$1630 plus US$56 for UPS
ground shipping. I clear all of my own packages through customs so
there were no brokerage fees. I paid customs 7% pst and 7% gst for a
total of C$272.90 and there was no duty on the welder or the included
accessories. IOC was a treat to deal with and were very comfortable
with shipping goods to Canada. I ordered the welder on Aug 24th and
received it on Aug 30th.

The power requirements for the two welders are quite diffrent but both
have a NEMA 6-50 230V 50A welding plug. The 185TSW draws a maximum of
38A in stick mode and 29A in Tig mode. The SW175 draws maximum 54A in
AC/DC stick and DC tig mode and 71A in AC Tig mode. On the other hand,
I ran my SW175 off of a 40A range circuit for a few years and never
tripped the breaker.

I hope this helps.
Harold