As improved thermal enclosures dramatically reduce heating and cooling loads, the water heating load continues to grow in importance. This Top Innovations profile describes Building America field testing that shed light on how real-world water usage affects energy saving estimates of high-efficiency water heating systems.
Although tankless gas water heaters should save approximately 33% on hot water heating compared to a conventional storage water heater, actual energy savings vary significantly based on individual draw volume. Above 10 gallons per draw, the efficiency approaches the rated energy factor. The greatest savings occur at a daily use quantity of about 50 gallons. Read about this Top Innovation.
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