Leister Welder Question

Getting conflicting answers from Leister, GAF and my supplier.

I have been told to get 2 of the Uniroof models at 20 fpm rather than 1 Varimat at 32 fpm. Ok, most seemed to agree with that, now which should I get, the 120v models or the 230v?

It's a 300 SQR job, btw.

I have no experience with anything other than varimat. But wind, power drain and a host of other factors cam cause cold welds. I believe if you stay at 220 you will be much But in the long run. Bigger gen sets run easier and last longer too.