the people of isfahan believed since the old times, that shaykh bahai built the stove of this hammam, so that it can be warmed by only one candle and under the cauldron of the stove, he made an empty closed space and lit a candle in it and the candle was lighted for a very long time and the water of the hammam became warm by it. there are different theories about the fuel of the garmkhaneh, which can not be proved because there is no candle and no complete research has been done yet.