An appliance for heating water above its ambient temperature, generally for domestic use
Closed vessel in which water is heated by the combustion of fuels, electricity, or any other source and is withdrawn for use external to the system at pressures not exceeding 160 psig, including the apparatus by which heat is generated and all controls and devices necessary to prevent water temperatures from exceeding 210°F
Device for heating and storing water Heat is generated by gas, electric, or steam