Pentair MasterTemp Heater Tube Sheet 125,000 BTU (P/N: 474971) SHIPS IN 6 TO 8 WEEKS
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Fits MasterTemp 125 heater
Located in the combustion chamber.
Water flows through the heat exchanger tubes which extract heat from the flue gases.
If your heater is leaking out of the blower or venting or out of the top of the combustion chamber you could have a hole in the copper tube sheet.