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Shop for Heating, Venting & Cooling at The Home Depot. There are two major types of water heaters, those with coils and the twin walled tank. The water heater which we manufacture, the Tank-in-Tank, doesn't fall within either of these categories. The difference between our water heaters and those with coils is clear since in the former the primary fluid heats the domestic hot water from the outside while the other heats it from the inside out. On the other hand the twin walled water heaters have an area near the bottom which is not heated and the heat transfer surface is smaller than in the Tank-in-Tank.
Product Type: Water Heaters
Product Title: Triangle Tube 70-Gal. Indirect Water Heater SMART 80
Manufacturer: Triangle Tube
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