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THE tankless water tank can be a great option to provide warm water and to save energy. Eemax EX2412T S 2.4KW 120V 180° Electric Tankless Water Heater With continuous improvement, companies tankless water heater today are offering options that were not available just a couple of years ago. If you should be considering adding one or more of these units to your house, these guides about how to choose a tankless water heater should assist you in your decision making process.
DIMENSION TANKLESS OR DEMAND-TYPE WATER HEATERS
Tankless or demand-type water heaters are rated by the maximum heat range rise possible at a given flow rate. Eemax EX2412T S 2.4KW 120V 180° Electric Tankless Water Heater Therefore, to size a demand water heater, you will need to determine the flow rate and also the temperature rise you’ll need for its application (entire home or a remote application, such as just a bathroom) in your house.
First, list the sheer number of hot water devices you expect to use at any one time. Then, mount up their flow rates (gallons per minute). This is the desired flow rate you’ll want for the demand water heater. For example, let’s say you expect to simultaneously run a hot water faucet through a flow rate of 0.75 gallons (2.84 liters) per minute and a shower head having a flow rate of 2.5 gallons (9.46 liters) per minute. Some sort of flow rate through the demand water heater would need to be at least 3.25 gallons (12.3 liters) per minute. To scale back flow rates, install low-flow water fixtures.
Most Eemax EX2412T S 2.4KW 120V 180° Electric Tankless Water Heater are rated for a number of inlet temperatures. Typically, a 70?F (39?C) water temperature rise is achievable at a flow rate of 5 gallons per minute with gas-fired demand water heaters and 2 gallons per minute through electric ones. Faster flow rates or cooler inlet temperature can sometimes lower the water temperature at the most distant spigot. Some forms of tankless water heaters are thermostatically controlled; they may differ their output temperature relating to the water flow rate and inlet temperature.
Size a Tankless Water Heater
When sizing a tankless water heater, you’ll want to think in terms of flow, not capacity. A tankless water heater doesn’t run out of hot water like a storage water heater can, but it might not be able to heat water fast enough to serve multiple fixtures at once.
A tankless water heater is given BTU (British Thermal Unit) input and efficiency ratings. These determine its flow rate, expressed in gallons per minute (GPM).
One BTU is equal to the amount of energy required to raise the temperature of 1 pound of water 1 degree F. The higher a water heater’s BTU rating, the higher the flow rate. Under normal circumstances, it takes about 31,000 BTUs to provide 1.2 GPM; 190,000 BTUs deliver 5.7 GPM. Flow rates differ from about 1.2 to 6 GPM. Point-of-use models, such as those that provide hot water to a single bathroom sink, are rated 1.2 GPM. A 2.6-GPM tankless water heater will handle one shower with a time, a 4-GPM model one shower and one sink, and a 6-GPM two showers.
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