How a Fast Recovery Electric Water Heater Works
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Fast Recovery vs. Tank Heaters
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Fast recovery, or tankless, hot water heaters are designed to provide hot water on demand with little or no wait required. Because the hot water heater only heats precisely the amount of water required, there is no wasted energy and energy bills can be lowered significantly. Traditional hot water heaters store up to 75 gallons of water, which must be periodically heated to ensure that it's ready when the user requires it. This leads to increased wear on the heating elements and water heater components, as well as an expensive electric bill. Tankless water heaters work by heating only what is required and only on demand. This means that there is no energy wasted on heating water that isn't needed at that moment.
How a Fast Recovery Heater Works
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Tankless hot water heaters only heat water once if begins to flow from the faucet. When the homeowner turns on a hot water tap in the house, the heater registers that hot water is desired. The computer brain of the unit then determines how hot the water needs to be, based upon the homeowner's previously set preferences, There is a delay of up to 15 seconds while the cold water is expelled from the pipes, then the water gets warm just as it would from a normal hot water heater. The water heater continually heats the water as long as the tap is turned on and the flow sensors in the unit continually report how much water is being used. This means that the temperature of the heated water is kept constant regardless of how much is demanded at a given time. Once the faucet is turned off again, the heating unit turns off and doesn't turn on again until hot water is needed. This leads to significant energy savings over even short periods of time, and while these units are more expensive than traditional hot water thanks, they will pay for themselves in short order.
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Fast Recovery Components
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The fast recovery water heater consists of an electronic control module, which adjusts the amount of power used to heat the water and also computes the flow rate of the water to determine how much heat is required so the user isn't burned by overheated water. The heating unit itself is what actually provides the heat which is required and there may be up to five of these units in the water heater, depending on how heavy-duty the water usage is going to be. Each heating module is full of heating elements, which allows water to be heated almost instantaneously. There is also a flow sensor which handles the reporting of how much water is being used. This flow sensor is essential, since it recognizes how much water is being used and provides the information to the electronic control unit in order to allow it to control the amount of heat in the water. Many hot water heaters also use a built in filter on the inlet pipe to prevent calcium and other buildup from entering the system. These buildups can cause increased maintenance costs and system down-time and great care is taken in eliminating depositions from water before it enters the closed system.
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