The Pentair Tube Sheet Coil Assembly Kit (474061) is the OEM replacement heat exchanger assembly for the MasterTemp 400 and Max-E-Therm 400 gas heaters. This kit provides everything needed for a complete tube sheet and coil service, including the coil assembly, seals, O-rings, insulation, gaskets, bypass valve, and ignitor components. ⚠️ IMPORTANT: THIS IS A COMPLETE KIT — NOT AN INDIVIDUAL COIL ASSEMBLY Part 474061 is sold as a multi-piece service kit. It includes the tube sheet coil assembly plus associated O-rings, seals, gaskets, insulation, bypass valve package, RTV silicone, and ignitor kit. Review the full kit contents below before ordering. ⚠️ IMPORTANT: MAX-E-THERM 400 DATE RANGE RESTRICTION This kit is confirmed for Max-E-Therm 400 (NA/LP) heaters manufactured after January 12, 2009. If your Max-E-Therm 400 was manufactured before that date, verify this part number against your equipment's serial plate and service manual before ordering. ⚠️ IMPORTANT: LICENSED PROFESSIONAL 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 tube sheet coil assembly is the core heat exchanger in Pentair's MasterTemp and Max-E-Therm 400K BTU heaters. Unlike straight, flat heat exchangers found in many other heaters, Pentair's design uses a rounded coil configuration — a distinguishing characteristic of this heater family. A degraded or leaking tube sheet coil results in loss of heating efficiency, water contamination of the combustion chamber, or visible water leakage at the heat exchanger. Replacing this assembly restores the heater to OEM thermal performance specifications. Kit Contents 1 × Tube Sheet Coil Assembly 8 × O-Ring, Coil 8 × Tube Sheet Seal 1 × O-Ring, Metal Tube Replacement 1 × Manifold Bypass Valve Package 1 × Blower/Adapter Plate Gasket 1 × Ignitor and Gasket Kit 1 × Service Kit Insulation (Wool) 1 × High-Temp RTV Silicone 1 × Label, Sheet Metal Warning Specifications Pentair Part Number 474061 Quantity Included Kit (see Kit Contents above) Tube Sheet Plate Dimensions 5-1/2" W × 8-1/2" H Coil Width (Side to Side) Approx. 13" Coil Length (Plate to Opposite End) Approx. 15" Compatible Heater BTU Rating 400,000 BTU Fuel Type Compatibility Natural Gas (NA) and Liquid Propane (LP) Fits Into Brand Equipment Line Model / Part Number Notes Pentair MasterTemp Heater (MasterTemp Series) 400NA Includes Item No. 3 Pentair MasterTemp Heater (MasterTemp Series) 400LP Includes Item No. 3 Pentair Max-E-Therm 400 (Max-E-Therm Series) MAX-E-THERM-400-NA NA/LP Series 400 Models. For heaters manufactured after 1/12/09. Verify fitment before ordering. 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. Pro Tip Before ordering, locate the model number and manufacture date on the rating plate inside the heater cabinet. For MasterTemp 400 units, confirm NA (natural gas) or LP (propane) designation matches your fuel supply — both variants use this same kit. For Max-E-Therm 400 owners, the manufacture date on the serial plate must be after January 12, 2009 for this kit to apply. When servicing the tube sheet, use the included high-temp RTV silicone and follow Pentair's installation manual torque specifications for the tube sheet fasteners to ensure a proper seal.
