PT 185: water cooled questions ?

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Hi-
I was given a PT- 185 as a gift this past holiday. I have a few questions about changing my machine from an air-cooled torch setup to a water unit
I plan on upgrading to a water torch and closed loop cooler system. Can anyone recommend what brand water torch I should purchase. Should I go with the Lincoln water torch package or something like a Weldcraft ? Lastly, does anyone have any advice about building a closed loop water cooler? How many GPM should the system pump flow? Should the system operate on a thermostat? How much cooling capacity should the system have? Can glycol be run in the cooling system (my shop isn’t always heated)?
Any words of advice would be much appreciated!
Thanks-
Graham