Heater Assemblies, Sensors, Boards, and Flow Components Designed for JXi models, the Jandy JXIVFKIT VersaFlo Bypass Accessory Kit optimizes hydraulic efficiency by bypassing the heater when heat is not needed. The Raypak SRV Burner Kit 100-10000414 includes ten replacement burners to restore flame performance in select Raypak heaters. Use the Raypak Bypass Valve Assembly 016194F to manage water flow and reduce heater strain in digital Raypak units. Protect JXi heaters from corrosion with the Jandy R0965100 Anode Kit, which helps prolong heat exchanger life in saltwater or aggressive water conditions. For temperature safety, the Hayward FDXLEGL1930 Exhaust Gas Temperature Limit protects H-Series heaters from overheating conditions. The Hayward HAXFHD1931 Front Header replaces cracked or damaged headers in post-10/28 production H-Series heaters. For spark control issues, the Hayward HAXIGN1931 Ignitor Bracket helps realign and stabilize the ignitor position in H-Series models. The Pentair Tube Sheet Coil Assembly 77707-0233 replaces leaking or corroded heat exchangers in MasterTemp and Max-E-Therm 300 heaters. For electronic control restoration, the Pentair Control Board 42002-0007S includes a 6-button keypad for MasterTemp and Max-E-Therm compatibility. The Hayward Integrated Control Board FDXLICB1930 provides reliable interface management for H-Series heater diagnostics and operations. Control system issues in Jandy setups can be resolved with the Jandy R3008800 User Interface, a universal display that communicates with select automation systems. Designed for ETI 400 models, the Pentair Control Board 475975 helps restore automated operation and display accuracy. From sensors to control boards, these replacement parts help maintain efficient heating in top systems from Hayward, Raypak, Jandy, and Pentair.