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What some people don't realize on a tankless heater is the amount of gas required to heat water for more than one hot water application. A conventional 40 gal. water heater requires enough gas to produce 35 to 40,000 BTU's. A tankless heater serving two applications requires up to 175,000 BTU's to keep hot water flowing. If you run it very long your gas savings goes out the door. Like everything many factors have to be considered in predicting your savings. These stats are based on stick house units.
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2006 3000RK
2009 Ram 2500
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