The heater tubes work independently, it does not get affected by corrosion and lime. Water flood danger is prevented by automatic water discharge system. The external body is fiberglass and it has electric isolation. There won't be any rust and rot.It has models which work with 220V and 380V. Ideal working pressure is 1.5-2 atu. The system automatically becomes off for safety reasons when it looses water and the pressure is under 1 atu. The system starts to work again when the water is filled. The system pressure returns normal by discharging water when the system goes over 3 atu. The heating tubes becomes on and off automatically upon the environment's temperature. The circulation pump has 3 grades nad it works silently. The room temperature can be automatically adjusted by room thermostat upon choice. It has different models between 6000-120.000 Kcal/h capacity.