According to "The Book of Geese" by Dave Holderread, these are considered heavyweight breeds:
African (males 22-28 lbs, females 18-24 lbs)*
Embden (males 28-34 lbs, females 24-28 lbs)*
Dewlap Toulouse (males 26-30 lbs, females 20-24 lbs)*
Of course, this would be top of the line show stock with optimal nutrition and environment.
Some books I have read also consider the American Buff to be a heavyweight breed as well, males around 16-20 lbs and females around 12-16 lbs.
I haven't found height ranges, but have seen references to 3 ft tall Embdens and Africans
*weight ranges provided by "Domestic Geese" by Chris Ashton.