A word about our stone heaters: We recommend food-grade heaters for our customers. We get many people inquiring as to why we don't use the brand that says "stone heater." This is because these heaters need to be "seasoned" or to have some type of burning off period. These heaters smell terrible during the burning off process. Food grade heaters generally don't require this and can be used right out of the box with no odor. Please note that free shipping does not apply to stone heaters.