I read somewhere that Weil Mclain now owns Williamson, but can't really
confirm this anywhere.

I recently got a quote to change my boiler, originally quoted in the
price was a Weil Mclain EG-55, but what was delivered was a Williamson
GSA-200N-S. They seem to have comparable AFUE, and BTU ratings. Both
200000 BTU and 81.9 AFUE rating. Both have a 10 year warranty. Does
anyone know if Weil Mclain actually owns Williamson? Any opinions on
these 2 units? Is one better than the other?

Thanks in advance,
Gus