The Sanskrit word Tapovan names a place of tapas: a grove or seat where a Nath yogi does strong spiritual exertion. The root is that heat.
Within the International Nath Order the everyday seat is the zonule. Shambhala Tapovan was Mahendranath’s last hermitage in Mehmadabad. That is a place-name. This page names the class. A zonule may be a tapovan in function. It is not automatically that house.