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Old 09-28-17, 12:11 AM   #20
oil pan 4
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Join Date: Nov 2012
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The tankless waste water by the nature of their opperation.
When the water starts flowing it has to flow for so many seconds before the burner lights, then when it lights it has to get up to temperature.
Unlike a tank water heater where the water is at temperature already, so the hot water starts flowing as soon as the first drop.
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