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WARNINGS: IMPORTANT: DO NOT apply heat to the HOT or COLD water connections. If sweat connections are used, sweat tubing to adapter before fitting adapter to Rheem High Efficiency Tankless Gas Water Heaters save up to $1,100 over 12 years1 (select High Efficiency models only) save installation time and money4 See instruction manual before setting temperature at water heater. Rheem Manufacturing Company (Rheem) warrants this tankless gas water heater,The tankless water heater must be installed in accordance with the Installation Instructions listed in the Use and Care. Manual provided with the tankless water The water heater operates automatically, heating water as it passes through the water heater. When a hot tap is opened, the gas burners ignite to provide