how many amps does an electric tankless water heater require?
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Unfortunately, the average electric tankless water heater needs at least 120 amps to operate and the average household's total capacity is 200 amps.
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Tankless water heaters save money in the long run, but initial costs are higher than tank models. ... The U.S. Department of Energy estimates gas-fired tankless heaters save an average of $108 in energy costs per year over their traditional tank counterparts, while electric tankless heaters save $44 per year.
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Without timer, cold and hot water = 2.8 kWh/day The water cooler used 2.8 kilowatt-hours in a 24 hour period, which equates to about 1022 kilowatt-hours ($245.00) per year.
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According to Energy.gov, “For homes that use 41 gallons or less of hot water daily, demand (or tankless) water heaters can be 24% to 34% more energy efficient than conventional storage tank water heaters.” Tankless water heaters (if gas-fired) will save homeowners over $100 annually the longer they remain in service.
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Electric tankless water heaters also cost less to install than gas units. The installation costs for electric systems range from $800 to $1,500, while installation for gas units cost between $1,000 and $1,500. Gas water heaters require venting to prevent the buildup of harmful gases inside the home.
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Typically, a hot water heater that uses a tank will run for three to five hours per day. So, a 4,000-watt heater used for three hours a day at $. 10 per kWh will cost $1.20 per day, about $36.50 per month, or $438 per year.
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Tankless water heaters heat water directly without the use of a storage tank. ... Either a gas burner or an electric element heats the water. As a result, tankless water heaters deliver a constant supply of hot water. You don't need to wait for a storage tank to fill up with enough hot water.
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Tankless: Gas and electric tankless water heaters run more efficiently than the conventional water heaters of the same fuel type. ... Banta says it's worth noting that while gas water heaters are less expensive to operate, it's due to the lower cost of natural gas and not because they're necessarily more efficient.
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Installing a water heater costs $804 and $1,546, or an average of $1,159, including the unit and labor. Tankless heaters cost about $1,000 to $3,000. Water heaters cost $300 to $2,000+ for the unit alone while plumber labor runs $45 to $150 per hour.
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1 Unit of Electricity is equal to 1KWh(1000Watts/h), amount of energy used by a 1kW (1000 watt) electric heater for 1 hour. Well now Let's convert 1 Amp To Watts. Power in watts equals amperes times voltage. So, in a direct current, 1 amp at 110 volts equals 110 watts, whereas 1 amp at 220 volts equals 220 watts.
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Besides, EVERY 120 volt, 15 and 20 amp receptacle outlet in a garage needs to be GFCI protected, so, it a tankless water heater is in a garage, and it is plugged into a 120 volt outlet, then it should be GFCI protected anyway.
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The U.S. Department of Energy estimates gas-fired tankless heaters save an average of $108 in energy costs per year over their traditional tank counterparts, while electric tankless heaters save $44 per year. ... Rewiring your house can easily add as much as $5,000 to the cost of installing a tankless water heater.
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Gas tankless water heaters use just a tiny amount of amperage to ignite the flame. Unless the manufacturer requires it, there is no need for a dedicated circuit.
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Electric models need a lot of juice Dana Dorsett adds some particulars: a whole-house tankless draws more than 25,000 watts of electricity and needs a 150-amp, 240-volt breaker. The total electrical service for many houses is less than that, he adds.
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Bottom line, For a 4500w heater w/240v it will draw 4500/240 or 18.75 amps so #10 wire and either 25 or 30 amp breaker, depending on code.