Types of Indirect Water Heaters:
Storage Type: Includes a tank with a heat exchanger, either a tank-in-tank design or a coil-type heat exchanger inside.
Instantaneous Type: Uses a flat plate heat exchanger for rapid water heating.
Storage Type Indirect Water Heater:
Cold potable water enters the tank and absorbs heat from the coil heat exchanger.
Controlled by a temperature sensor that activates the circulator and boiler when water temperature drops below 120°F.
Provides a steady supply of hot water, even when the boiler is off.
Instantaneous Type Indirect Water Heater:
Uses a flat plate heat exchanger where hot boiler water flows through alternating plates, and potable water flows between them.
Heat is transferred efficiently without mixing the boiler water and potable water.
The system is designed for maximum efficiency with hot and cold water flowing in opposite directions.
Efficiency:
Modern high-efficiency boilers (over 90%) paired with indirect-fired water heaters are significantly more efficient than electric or standard gas-fired tank-type heaters.
These systems, often made with stainless steel, are durable and long-lasting.
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