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To read more: http://www.takagi.com/support/warranty

AC: Alternating Current - Electrical supply in which the polarity of the hot wire reverses rapidly. AGA: American Gas Association. Ambient Temperature: The average temperature of the atmosphere in the vicinity of an appliance. Ampere: Unit of measure of current flow. Anode Rod: A sacrificial rod composed of one or more metals installed in the water heater that protects the tank from corrosion helping extend the life of the tank. Anti Scald Valve: Device used to prevent high water temperature. ASHRAE: American Society of Heating Refrigeration Air Conditioning Engineers. ASME: American Society of Mechanical Engineers. Atmospheric Combustion: Combustion takes place when gaseous, liquid or solid fuels react at an elevated temperature with oxygen by burning, thus releasing heat in an open combustion system.

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Most are about the size of an average suitcase. The Takagi line ranges from less than two feet high by 14 inches wide, weighing 30 pounds; to 28 inches high by 19 inches wide weighing 90 pounds. Most models are small enough to hang on a wall. This product must be installed and serviced by a licensed plumber, a licensed gas fitter, or professional service technician. Improper installation and/or operation, or installation by an unqualified person, will void the warranty. It can be installed anywhere with access to adequate combustion air and where the heater exhaust can be vented to the outdoors, it should not be installed outdoors if the home or business is located in a freezing climate. In a replacement situation, a tankless heater can usually go where the heater currently is located, although The User may want to relocate the new unit to create more room or to achieve better venting options.

To read more: http://www.takagi.com/support/frequently-asked-questions