First off, there are cat heated beds that are self-warming; this means they don’t require any plug-ins to work. No electricity is required since they use body heat to warm up your pet. Heated beds that do run on electricity have quite a low wattage as they have been designed to ‘warm’ up and don’t really require so much power to do so. There are also heated cat beds that run on as low as 4W ranging up to about 30w. Even with a heated bad that runs on 15W, users still won’t spend more than $1.20 on monthly electricity bills.\r