Coffee warmers are a personal choice. Do you nurse a single cup of coffee for hour after hour, or do you knock back cup after cup until morning is gone? Either way, there’s a warmer that will keep steaming hot coffee literally within an arm’s reach. Some rely on time-tested vacuum insulation technology, while others go the high-tech route with multiple electronic modes. Your first step towards choosing a coffee warmer is to decide how much coffee you want to keep warm in the first place.