Pentair/Sta-Rite Maxetherm Heater Tube Sheet 200,000 BTU (P/N: 77707-0232)
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Fits the Sta-Rite Maxetherm heater 200k btu model
Located in the combustion chamber.
Water flows through the heat exchanger tubes which extract heat from the flue gases.
Comes with o-rings, insulation, hot surface igniter.
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.