All terms of the Rinnai warranty are effective from date of installation of the Electric Hot Water System and Rinnai reserves the right to verify this date by requesting a copy of the Certificate of Compliance which must be issued by the installer in all States & Territories of Australia. For detailed terms and conditions and the definitions of what is deemed to be a domestic or commercial installation, please refer to the Installation/Operation manual supplied with the appliance or on-line at www.rinnai.com.auRinnai Australia Pty. Ltd. reserves the right to make modifications and change specifications without notice.