Hayward® Universal HC Series HDF400 Dual‑Fuel Pool Heater – 400K BTU, Natural Gas/Propane, Low NOx

Dual‑fuel pool and spa heater delivering 400,000 BTU with Low NOx emissions, compatible with both natural gas and propane for installation flexibility. Features a corrosion‑resistant cupro‑nickel heat exchanger and a compact, zero wall clearance design that fits tight equipment pads. Easy‑access reversible top and exclusive plumbing adapters simplify installation and maintenance. Designed for efficient, reliable year‑round heating with flow support up to ~125 GPM and environmentally compliant operation.