Hayward Universal H-Series Natural Gas Heater 400,000 BTUs, Low NOx | W3H400FDN
Hayward Products
SKU: W3H400FDN
Hayward Universal H-Series Natural Gas Heater 400,000 BTUs, Low NOx | W3H400FDN
The Hayward Universal H-Series W3H400FDN Low NOx Pool Heater delivers powerful performance with an impressive 400,000 BTUs, making it the perfect choice for large residential or commercial pools and spas. Engineered for energy efficiency and dependable operation, this natural gas heater is designed to meet the rigorous demands of pool professionals and pool owners who value robust heating capacity and durability.
Equipped with a premium cupro nickel heat exchanger, the W3H400FDN provides exceptional resistance to corrosion from salt water and chemically treated pools, ensuring longer life and reliable heating performance. Its universal design makes it highly adaptable for new installations or as a replacement, with flexible plumbing and electrical connections to suit diverse system requirements.
Compliant with low NOx emission standards, the W3H400FDN is an environmentally responsible solution that contributes to improved air quality. Hayward’s dedication to innovative engineering ensures this heater delivers fast, efficient, and consistent heating to keep your pool water at the perfect temperature throughout the swimming season.
- Model: W3H400FDN
- Fuel Type: Natural Gas
- Heating Capacity: 400,000 BTUs
- Heat Exchanger: Cupro Nickel for superior corrosion resistance
- Energy-efficient design helps reduce operational costs
- Electrical Requirements: 120V / 240V
- Amperage: 5.5 amps
- Minimum Flow Rate: 20 gallons per minute
- Plumbing Connections: 2" x 2-1/2" CPVC union fittings
- Patented header by-pass design for optimized hydraulic performance
- Low NOx emissions compliant with clean air quality standards
- Application: Suitable for large residential and commercial pools and spas
SKU: W3H400FDN
Questions about returns? View our return policy.
Hours Of Operation:
Monday - Friday: 7:00 am to 5:00 pm Phoenix Time
Saturday: 8:00 am to 2:00 pm
Sunday: Closed
- We do not ship on Saturday or Sunday.
- Orders totaling more than $300 will require signature confirmation upon delivery.
- We process and prepare orders for shipment within 1 business day. Please note that many other pool supply retailers require 3–5 days of handling time before shipping.
- Orders placed after 1:00 pm Phoenix Time may not be eligible for same-day shipment.
- Expedited shipping options are available at checkout.
Return Policy:
- Products that are received damaged will receive a refund in store credit.
- Most products are eligible for return within 30 days of receipt, except where noted below.
- To initiate a return, please complete an RMA form prior to sending your item back.
- Original shipping costs are non-refundable and will be deducted from the return credit.
- Items returned missing accessories or original packaging, or that are not in the same condition as received, may be subject to a restocking fee of up to 100% depending on the condition of the item upon return.
- Some returns will be charged an automatic 15% restocking fee.
- We are unable to issue refunds for items that have been damaged or rendered inoperable due to installer error.
- Please complete the return form to receive your RMA number and return shipping label.
- Chemical products are not eligible for return under any circumstances.
- The Pentair Colorsync 618031 is not eligible for return.
- Pool cleaners are not eligible for return.
- Opened seals and o-rings are not eligible for return.
- Capacitors are not eligible for return.
- Plastic popup tools are not eligible for return.
- Automation components and circuit boards are not eligible for return.
- If a light is returned due to a reported malfunction and is found to be fully operational upon testing, return shipping costs and a restocking fee will be deducted from the refund.
- Orders refused at the time of delivery will be subject to the original shipping costs being deducted from the refund.
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