Range Steps to Check Cookware For Best Performance

For best cooking results on all ranges, particularly a smooth radiant top, cookware with a flat bottom surface is highly recommended. We suggest the following to determine if your cookware is flat:

Ruler Test:

  • Turn the pan upside down and place a ruler or other straight edge across the bottom of the pan.
  • The straight edge should touch the pan evenly across the entire surface. If the pan has a very slight concave towards the center, this is acceptable.


Boiling Water Test:

  1. Place pan on heating surface with 1 inch of water in it and turn control to High.
  2. When the water begins to boil, observe the pattern of the bubbles. If the pan is not flat, bubbles will be clustered to one side or bunched in the middle rather than an even distribution.


We recommend having good flat pans when cooking on any surface type. Pans that are not flat can cause the cooktop surface temperature to be higher since the pan is not absorbing the optimum amount heat.