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== Support ==* [http://www.worldmkting.com/ World Marketing of America, Inc.]* [http://www.worldmkting.com/gastroubleshooting.htm Frequently Asked Questions (FAQ) - GAS APPLIANCES]* [http://www.worldmkting.com/support/gas_heaters1.htm#Modulating%20Thermostat%20Control%20Valves: Installation and Basic Components]