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On a cooler (1/5th HP) pump, I can't see any advantage to 220V. Most times the 220V option is offered for overseas where 120v is not available.
I would think a 220v pump would hurt the resale.
Check out arc-zone. They have a complete cooler/torch package for less than the Coolmate 3.
You also might want to check out ebay. I just bought (as a backup to an old Radiator 1) a new Bernard SS cooler for considerably less than a Coolmate 3. Cooler is all SS and is made by ITW. It's just not blue to match the Dynasty 200. Most all the coolers use the Procon pumps so it's hard to go wrong.
Syncrowave 250 DX Tigrunner
Dynasty 200 DX
Miller XMT 304 w/714D Feeder & Optima Control
Miller MM 251 w/Q300 & 30A SG
Dialarc 250 AC/DC
Hypertherm PM 600 & 1250
Wilton 7"x12" bandsaw
PC Dry Cut Saw, Dewalt Chop Saw
Milwaukee 8" Metal Cut Saw, Milwaukee Portaband.
Thermco and Smith (2) Gas Mixers
More grinders than hands
One situation where the 220 cooler would be applicable is if you happen to have built an extension cord for the welder and only ran the two hot wires and a ground - i.e. a 220 only extension cord. Yes, a rather myopic design but it solved a problem at the time. But adding a cooler it will require a 220 cooler, an extra extension cord, or Dynasty 350 or similar that has a 110 outlet on the back.