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A, can be installed by a qualified electrician. The green colored rigid ear, lug, or the like extending from the adapter must be connected to a permanent ground such as a properly grounded outlet box cover. Whenever the adapter is used, it must be held in place by a metal screw. Note: In Canada, the use of a temporary adapter is not permitted by the Canadian Electrical Code. OptiHEAT™ Heat Retention System (available on some models only) IMPORTANT: Fill clean water tank with hot tap water. Do no