Abstract: An instantaneous water heater comprises a sealed enclosed tank having a top portion, a bottom portion, a first end, and a second end, and an inlet, a baffle tube, and a baffle segregating said tank into a baffle chamber and a main heating and storage chamber. The baffle chamber receives unheated water from said baffle tube. The baffle has baffle openings between said baffle chamber and said main heating and storage chamber providing for intermixing of water therebetween. The tank has a plurality of heating elements and a plurality of temperature sensors and activators. The main heating and storage chamber has an outlet and a safety valve attached thereto, said outlet discharging heated water from said tank and being located in said top portion of said first end of said tank and said safety valve preventing over-heating and over-pressurization in said tank.