ELECTRICAL WATER HEATERS WITH SINGLE HEAT EXCHANGERS (THERMO BOILER) Thermo boilers get its heating energy from solar collector, central heating system or electric heating element and produce potable hot water. Fluid in the serpentines provides heat transfer water to water via transferring its heat energy to water in inner tank. Thus potable hot water will be produced. Cylinder type hot water tank and serpentines in the tanks is coated with immersing to hot galvanize. Thus anode rod is not needed and you save your time and cost for changing anode rod. Due to special coating material heat transfer is faster and heating efficient is high. You can set desired temperature with adjustable thermostats mounted to sensor holes. When water temperature has achieved desired temperature, thermostat will send a signal then circulation and recirculation pumps will be out off service. Thus it will prevent waste operation. DTB series boilers have additional heating elements. Thus, especially in summer periods you can provide hot water with electrical supply without using central heating system.