Restore heat transfer in a compatible Hayward H300FD pool or spa heater with this genuine OEM replacement heat exchanger assembly. It is designed for the 300,000 BTU/hr Universal H-Series Low NOx platform when a technician has confirmed the exchanger is damaged or leaking.

It suits targeted repairs when the rest of the heater remains fit for use after inspection. Have a qualified pool heater technician install it according to Hayward’s service instructions and investigate what caused the original failure.

• H300FD fit: Made for the H300FD configuration; older Millivolt, ED1 and ED2 heaters, and other heater capacities use different assemblies.
• Plastic header: The plastic-header design matches the assembly identified for this heater platform.
• Included part: One replacement heat exchanger assembly; the complete heater, burner assembly, gas valve and electronic control system are not included.
• Check before ordering: Match the complete heater model and serial number against the applicable parts diagram to confirm the correct assembly.
• Shipping size: 18.5 × 8.5 × 38.5 inches; shipping weight is 40.5 lb.
• Replacement-part warranty: 1 year, subject to Hayward’s terms.

During installation, the technician should inspect related seals, connections, safety components and the combustion area. Checking water chemistry, circulation and combustion can help address conditions that may contribute to exchanger damage.