Please do not use pans that are heavier than recommended by the manufacturer  as this may cause the elements to break in which case you may be asked to pay for any repair costs incurred.Use cookware about the same size as the surface cooking area, element or surface burner. Cookware should not extend more than ½" (1.3 cm) outside the cooking area.


From Affordable Appliance 
The durability of  element is based in the daily use and care that customer take, is the same with receptacles. No maximum weight has been recommended to me, depends of the common sense of each independent individual. 
manufacturer offers 90 days warranty on elements and receptacles