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Noritz and Takagi are both good units - made in Japan. To work optimally, they need gas supplies larger than the standard line used for a regular water heater. They burn at a higher BTU rate to provide the instant and constant hot water supplied. This means a 1 1/4" supply line all the way from the meter, including a upsized meter, not the standard 1/2" or 3/4" line, otherwise the gas can't keep up with the flow, and the unit will continually choke off the water flow until the target temp is reached.
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