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Pentair MasterTemp 200, 250, 300 & 400 Heater Replacement Parts Diagram

Interactive parts diagram

61 parts · 14 with cheaper aftermarket options. Tap a number on the diagram, or search by part number.

– exploded view with numbered parts

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Heater made 1/12/2009 to 10/31/2013? Show older parts
Older parts

    • Not sold online Pentair 3/4" gas union (2 needed) 38404-4097SCall us and we'll get it for you.
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  3. Model
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  5. Model
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        • Not sold online Pentair air orifice grill 42001-0114SCall us and we'll get it for you.
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        • Not sold online Pentair one-piece metal combustion chamber assembly, clamp lid (heaters made 1/12/2009 to 10/31/2013) 474095Call us and we'll get it for you.
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        • Not sold online Pentair one-piece metal elbow / combustion chamber cover assembly, clamp lid (heaters made 1/12/2009 to 10/31/2013) 474094Call us and we'll get it for you.
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        • Not sold online Pentair tub O-ring kit, 9-bolt lid (heaters made after 10/31/2013) 474952Call us and we'll get it for you.
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        • Not sold online Pentair metal vent cover 42002-0005SCall us and we'll get it for you.
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        • Not sold online Pentair heater top 42002-0034ZCall us and we'll get it for you.
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        • Not sold online Pentair heater bottom 42002-0031ZCall us and we'll get it for you.
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        • Not sold online Pentair J-box cover 42002-0041ZCall us and we'll get it for you.
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        • Not sold online Pentair panel screw and clip kit 474292Call us and we'll get it for you.
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        • Not sold online Pentair thermal regulator cap O-ring 35505-1313Call us and we'll get it for you.
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        • Not sold online Pentair 3/4" zinc pipe plug U78-60ZPSCall us and we'll get it for you.
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        • Not sold online Pentair pressure relief valve (recommended, sold separately) 473715ZCall us and we'll get it for you.
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        • Not sold online Pentair igniter bracket 42001-0030SCall us and we'll get it for you.
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        • Not sold online Pentair igniter gasket (also in igniter kit 77707-0054) 42001-0066SCall us and we'll get it for you.
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        • Not sold online Pentair heater top 42002-0034ZCall us and we'll get it for you.
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        • Not sold online Pentair tub O-ring kit, clamp lid (heaters made 1/12/2009 to 10/31/2013) 474201Call us and we'll get it for you.
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      Also fits your Pentair MasterTemp 200, 250, 300 & 400 Heater

      Not shown on the diagram, but made for this pump.

      Fit guide

      Which MasterTemp part fits your heater?

      Check the model number on the heater rating plate (for example 460730 = MasterTemp 200 natural gas). Part numbers come from Pentair's MasterTemp replacement parts lists. The diagram is split into burner (B), water (W) and electrical (E) systems.

      Heat exchanger (tube sheet coil kit) by heater size

      Burner parts for the MasterTemp 200

      Air blower kit natural gas
      77707-0251
      Air blower kit propane
      77707-0254
      Flameholder kit
      77707-0202
      Air orifice kit
      77707-0111
      Gas orifice kit natural gas / propane
      77707-0431 / 77707-0461
      Conversion kit NG to propane / propane to NG
      77707-1461 / 77707-1431

      Water system for the MasterTemp 200

      Manifold kit
      77707-0014
      Basic manifold kit all sizes
      474200
      Coil / tube sheet O-ring kit 6 O-rings
      77707-0117
      Manifold O-ring kit all sizes
      77707-0120

      Clamp lid or 9-bolt lid?

      Clamp lid tub (made 1/12/2009 to 10/31/2013)

      • Combustion chamber assembly 474095
      • Elbow / chamber cover assembly 474094
      • Tub O-ring kit 474201

      9-bolt lid tub (made after 10/31/2013)

      • Combustion chamber assembly 474957
      • Elbow / chamber cover assembly 474958
      • Tub O-ring kit 474952

      Pentair notes that the clamp-lid kits also include the clamp assembly, O-ring and silicone tube.