Don't Let Regulator Manufacturers Fool You
It is a violation of United States federal law for a company to condition their warranty on the consumer's use of a specific product.
According to the Magnuson-Moss Warranty Act:
"No warrantor of a consumer product may condition his written or implied warranty of such product on the consumer's using, in connection with such product, any article or service (other than article or service provided without charge under the terms of the warranty) which is identified by brand, trade, or corporate name."
What does this mean? Simply, a company cannot require consumers to purchase only their products to maintain warranty, nor can they void warranty based on a consumer's use of a competitor's product in conjunction with theirs.