Pentair One Piece Metal Elbow/Combustion Chamber Cover Assembly for MasterTemp & Max-E-Therm Heaters | 474958
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About This Item
The Pentair One Piece Metal Elbow/Combustion Chamber Cover Assembly (474958) is the OEM replacement combustion chamber cover for MasterTemp and Max-E-Therm pool and spa heaters manufactured after November 16, 2013.
IMPORTANT: MANUFACTURED AFTER 11/16/13 — 9-BOLT LID TUB DESIGN ONLY
This assembly is designed for MasterTemp and Max-E-Therm heaters built after November 16, 2013, which use the 9-bolt lid tub design. Heaters manufactured before this date use a different combustion chamber cover and are not compatible with this part. Verify your heater's manufacture date before ordering.
IMPORTANT: LICENSED PROFESSIONAL INSTALLATION REQUIRED
Gas and electrical heater components must be serviced by a licensed pool professional or qualified HVAC technician. Do not attempt to service gas or high-voltage components without proper certification.
The combustion chamber cover assembly encloses the combustion zone inside the heater, directing exhaust gases through the integrated metal elbow while containing heat within the combustion chamber. This one-piece design combines the elbow and cover into a single serviceable unit, simplifying replacement compared to multi-piece designs.
Specifications
| Pentair Part Number | 474958 |
| Part Name | One Piece Metal Elbow/Combustion Chamber Cover Assembly |
| Design | 9-Bolt Lid Tub Design — for heaters manufactured after 11/16/13 |
| Quantity Included | 1 (Each) |
Fits Into
| Brand | Equipment Line | Model / Part Number | Notes |
| Pentair | MasterTemp | 175NA | One-piece metal elbow and combustion chamber cover assembly; for heaters manufactured after 11/16/13 (9-bolt lid tub design) |
| Pentair | MasterTemp | 175LP | One-piece metal elbow and combustion chamber cover assembly; for heaters manufactured after 11/16/13 (9-bolt lid tub design) |
| Pentair | MasterTemp | 200NA | One-piece metal elbow and combustion chamber cover assembly; for heaters manufactured after 11/16/13 (9-bolt lid tub design) |
| Pentair | MasterTemp | 200LP | One-piece metal elbow and combustion chamber cover assembly; for heaters manufactured after 11/16/13 (9-bolt lid tub design) |
| Pentair | MasterTemp | 250NA | One-piece metal elbow and combustion chamber cover assembly; for heaters manufactured after 11/16/13 (9-bolt lid tub design) |
| Pentair | MasterTemp | 250LP | One-piece metal elbow and combustion chamber cover assembly; for heaters manufactured after 11/16/13 (9-bolt lid tub design) |
| Pentair | MasterTemp | 300NA | One-piece metal elbow and combustion chamber cover assembly; for heaters manufactured after 11/16/13 (9-bolt lid tub design) |
| Pentair | MasterTemp | 300LP | One-piece metal elbow and combustion chamber cover assembly; for heaters manufactured after 11/16/13 (9-bolt lid tub design) |
| Pentair | MasterTemp | 400NA | One-piece metal elbow and combustion chamber cover assembly; for heaters manufactured after 11/16/13 (9-bolt lid tub design) |
| Pentair | MasterTemp | 400LP | One-piece metal elbow and combustion chamber cover assembly; for heaters manufactured after 11/16/13 (9-bolt lid tub design) |
| Pentair | MasterTemp | MT125 | One Piece Metal Elbow/Combustion Chamber Cover Assembly, 9-Bolt |
| Pentair | MasterTemp | MasterTemp125 | One Piece Metal Elbow/Combustion Chamber Cover Assembly, 9-Bolt |
| Pentair | Max-E-Therm | 333NA | For heaters manufactured after 11/16/13 (New 9-Bolt Lid Tub Design) |
| Pentair | Max-E-Therm | 333LP | For heaters manufactured after 11/16/13 (New 9-Bolt Lid Tub Design) |
Compatibility is based on Pentair parts documentation and available OEM records. This is not an exhaustive list. For certainty, verify the part number in your equipment's manual or on the original part itself before ordering.
Poolaroo Pro Tip
Locate the manufacture date on your heater's rating plate — typically found on the front door panel or exterior label — before ordering. This assembly is correct only for MasterTemp and Max-E-Therm heaters built after November 16, 2013 with the 9-bolt lid tub design; earlier units require a different combustion chamber cover. Because this component sits directly in the combustion path, replacement should be performed by a licensed pool professional or qualified HVAC technician, with all 9 bolt points correctly seated and torqued before the heater is returned to service.
