Rheem RTE 9 Series Use and Care Manual - Page 12
Time/Temperature Relationship in Scalds, Routine Preventative Maintenance, Normal Maintenance
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Time/Temperature Relationship in Scalds Temperature 120°F 125°F 130°F 135°F 140°F 145°F 150°F 155°F Table courtesy of Shriners Burn Institute Time To Produce a Serious Burn More than 5 minutes 11/2 to 2 minutes About 30 seconds About 10 seconds Less than 5 seconds Less than 3 seconds About 11/2 seconds About 1 second Normal Maintenance Tankless water heaters are designed for a very long service life. Actual life expectancy will vary with water quality and use. The unit itself does not require any regular maintenance. However, to ensure consistent water flow, it is recommended to periodically remove scale and dirt that may build up at the aerator of the faucet or in the shower head. Routine Preventative Maintenance Properly maintained, your water heater will provide years of dependable trouble-free service. It is suggested that a routine preventive maintenance program be established and followed by the user. 12