CSA ANSI Z21.56A-2000/4.7A-M00
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Addenda 1 to ANSI Z21.56-1998/CSA 4.7-M98, Gas-Fired Pool Heaters
Scope This standard applies to newly produced pool heaters for heating non-potable water stored at atmospheric pressure, such as water in swimming pools, spas, hot tubs and s
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