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The Difference Between Storage and Tankless Water Heaters

by LiveModern Webmaster last modified Sep 07, 2012 01:01 AM
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by Alex Wilson last modified Sep 06, 2012

Author name:  Alex Wilson Blog Category:  Energy Solutions While they have higher efficiency, for most applications tankless water heaters don’t make sense. Rheem's Prestige condensing tankless water heater has an efficiency of 94%, 11,000 to 199,000 Btu /hour gas input, a maximum hot water delivery (at a 45°F temperature rise) of 8.4 gpm , and a minimum flow rate of 0.26 gpm . Click to enlarge. Photo Credit: Rheem Water Heating There are two primary types of water heaters: storage and tankless. In this column I’ll try to explain the differences between these two approaches and offer some guidance on choosing between them. (There are also “hybrid” water heaters with features of both that I’ll cover in a future blog post.) Storage water heaters Most water heaters are storage models. These are insulated tanks holding 20 to 120 gallons with either electric heating elements or gas burners. The storage tank stratifies with hot water at the top and cold incoming water at the bottom, so that as you draw off hot water (from the top), you get consistently hot water until the hot water is nearly depleted. The “first-hour rating” tells you how many gallons of hot water can be delivered in an hour.  read more






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