This heater is a marvel. When busy it sometimes lasts more than 10 hours. It is really necessary to put the cover as one might burn. Only the container to pour the liquid is not practical. Be careful not to push the "wick" because if it is no longer in contact with the burner that can not function. I met directly with the bottle and I wipe a little drips with paper and hop .... This is a fabulous product that remains in my bag all winter!