If a water heater is installed in a garage, it is recommended, and many codes require, that it be elevated at least 18 inches above the floor to reduce the potential for fire or explosion due to spillage or leakage of combustible liquids in the garage. For older houses where the water heater is part of the space heating boiler, and plumbing codes allow, some plumbers will install a "Watts 210" device in place of a TPR valve. When the device senses that the temperature reaches 99 °C (210 °F), it will shut off the gas supply and prevent further heating. In addition, an expansion tank or exterior pressure relief valve must be installed to prevent pressure buildup in the plumbing from rupturing pipes, valves, or the water heater.
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