Based on the home microwave options offered by multiple retailers like Best Buy, Wal-Mart and Sears, the brand that has the highest wattage microwaves for sale is Panasonic. Other Brands like Sharp and Kenmore also offer microwaves that rival the high wattage of Panasonic.
Panasonic offers multiple microwave models with a power of 1250 watts, which is the higher end of the spectrum for home microwaves. These models can be found at Best Buy and include sizes of 1.6 cubic feet and 2.2 cubic feet with choices of stainless steel, white and black finishes. Sharp has multiple models of 1100 watts of power that can be found at Wal-Mart.