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Estimating Costs and Efficiency of Storage, Demand, and Heat Pump Water Heaters | Department of Energy
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TCFUNDY 16L Tankless Water Heater Natural Gas, 4.23 GPM On-Demand Instant Hot Water Heater, Indoor Whole House Gas Water Heater, Digital Display & Touch Screen, Thermostatic & Energy Saving - Amazon.com
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40 Gallon Short Energy Efficient Natural Gas Water Heater - 6 Year Warranty - 6 40 GBFS | Reliance Water Heaters - Your Neighborhood Water Heater Source
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TCMT 16L Tankless Water Heater Natural Gas, 4.2 GPM On-Demand Instant Hot Water Heater, Indoor Whole House Gas Water Heater, Digital Display & Touch Screen, Thermostatic & Energy Saving - Walmart.com
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