- User-friendly: The Hayward W3H400FDN Universal H-Series pool and spa heater is designed with the user in mind, featuring an easy-to-read digital display and intuitive controls that make it easy to set and adjust the temperature of your pool or spa.
- Durable and reliable: Made with high-quality materials and built to last, the Hayward W3H400FDN Universal H-Series pool and spa heater is a reliable and durable choice for heating your in-ground pool or spa, ensuring that you can enjoy your pool or spa year-round.

The Hayward W3H400FDN Universal H-Series 400,000 BTU Natural Gas Pool and Spa Heater is an excellent choice for in-ground pools and spas. With its powerful heating capacity, it can quickly and efficiently warm up your pool or spa, allowing you to enjoy it all year round. The heater is designed to be energy-efficient, which means that you can save on your energy bills while still enjoying the benefits of a warm pool or spa. It is also easy to install and operate, so you won't have to worry about complicated setup procedures. The heater is made of high-quality materials, which ensures its durability and longevity. Overall, the Hayward W3H400FDN Universal H-Series 400,000 BTU Natural Gas Pool and Spa Heater is a reliable and efficient choice for anyone looking to heat their in-ground pool or spa.

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