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The installation of pool heaters shall comply with the following requirements:
1. In no case shall the clearances be such as to interfere with combustion air, draft hood or vent terminal clearance and relief, and accessibility for servicing.
2. A listed pool heater shall be installed in accordance with its listing and the manufacturer's instructions.
Where a pool heater is provided with over temperature protection only and is installed with any device in the discharge line of the heater that can restrict the flow of water from the heater to the pool (such as a check valve, shutoff valve, therapeutic pool valving, or flow nozzles), a pressure relief valve shall be installed either in the heater or between the heater and the restrictive device.
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