Hayward | HDF400 | Hayward HDF400 Universal HC Series Dual-Fuel 400K BTU Pool & Spa Heater – Compact, Energy-Efficient, Low NOx

Upgrade your pool or spa with the Hayward HDF400 Universal HC Series Heater. Offering 400,000 BTU heating capacity, dual-fuel compatibility (natural gas or propane), and a compact design, it ensures rapid heating and efficient operation.

Product Highlights:

• Dual-Fuel Flexibility: Easily converts between natural gas and propane with a simple mixing orifice change.

• High Heating Capacity: Delivers 400,000 BTUs per hour, efficiently heating large pools and spas.

• Compact Design: Features the industry's smallest footprint and zero wall clearance design for tight equipment pads.

• Durable Heat Exchanger: Standard cupro-nickel construction resists corrosion and wear for long-lasting reliability.

• Low NOx Emissions: Meets clean air quality standards, making it eco-friendly and regulatory compliant.

• User-Friendly Interface: Intuitive digital thermostat provides precise temperature control and diagnostics for easy operation.

• Installer-Friendly Features: Quick-access reversible top and exclusive plumbing adapters allow easy setup without cutting pipes.

Specifications:

• Model: Hayward Universal HC Series 400K BTU Heater (Dual-Fuel)

• Fuel Options: Natural Gas or Propane

• Heat Output: 400,000 BTU/hr

• Thermal Efficiency: 83%

• Voltage: 120V/240V (field-configurable dual voltage)

• Amperage: 4A at 120V; 2A at 240V

• Dimensions: 24" H x 18" W x 30" D

• Weight: 170 lbs

• UPC: 0610377402835

Ideal For:

• Residential Pools & Spas: Efficiently heats in-ground pools and spas.

• Replacement Installations: Compact design fits into existing equipment pads.

• Eco-Conscious Users: Low NOx emissions meet air quality standards.

The Hayward HDF400 Universal HC Series Heater combines advanced technology, energy efficiency, and user-friendly features to provide reliable heating solutions for your pool or spa.

Frequently Asked Questions

What is the Hayward HDF400?

It is a 400,000 BTU Universal HC Series dual fuel heater with a compact, low NOx design for pools and spas.

Does the Hayward HDF400 run on natural gas or propane?

It is a dual fuel heater that runs on natural gas or propane.

What size pool can the Hayward HDF400 heat?

Heater sizing depends on your pool or spa volume, the temperature rise you want and your climate. Compare with your current heater's BTU rating, or ask a pro to size it.

What is the difference between the HDF400 and HDF275?

Both are Universal HC Series dual fuel heaters. The HDF400 is rated at 400,000 BTU and the HDF275 at 275,000 BTU.

Learn more in our pool heater sizing guide.