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→Demand Water Heaters
=== Demand Water Heaters ===
[https://en.wikipedia.org/wiki/Tankless_water_heating Demand water heaters are tankless]. They are about the size of a suitcase. They use AC or gas to flash heat the water. They can deliver 200 to 500 gallons per hour, but require 3,500 to 24,000 Watts to do so. Although the peak current is higher than that of a tanked heater, the energy efficiency is higher, e.g., 6.3 to 4.6 GPH/A GPHA (5.45 median), with the larger units being more efficient.
Demand water heaters offer almost unlimited hot water and produce substantial savings in annual energy costs compared to a hot water tank. They have been around for decades and are common in Europe and Japan. Their capital cost is higher than a tank model but they typically last for 20 years; whereas a tank model will last for three to ten years. They are very simple:
