The Flash T-K2 from Takagi is a tankless water heater that delivers 240 gallons per hour of hot water every hour. No storage tank to run out means an endless supply of hot water. The Flash T-K2 takes up 2.2 cubic feet of space and features computer-modulated burners. The Flash T-K2 is capable of handling water flows ranging from 0.6 to 6.9 gpm, with heating capability of 19,000 to 185,000 Btu, all controlled by a computer board and sensors checking for flow, temperature and demand. Takagi.