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SW Mukilteo, WA 98275 Save Your Bill of Sale. To receive full warranty coverage, you will need to show evidence of the date you purchased your heater. Do not mail your Bill of Sale to us. We suggest that you attach your Bill of Sale to this page so that you will have all the information you need in one place should the need for service or information occur. Installation Warnings • Installation requirements are printed in the 1080 CF Installation Manual (part # 10001193). All requirements in the