The QuikWater has a patented water-cooled dry firing chamber. As cold water comes into direct contact with rising hot combustion air from a gas burner, an instantaneous heat transfer occurs. This heat transfer, in which all of the heat energy is absorbed by the water, is 99% energy efficient. Pure hot water then accumulates in the multi-sized integral storage tanks for “on demand” use. In most cases the unit will heat up to full operating temperature in less than 15 minutes from a cold start. Sizes range from 600,000 BTU to 70MM BTU.