Hayward Universal H-Series H350FDN 350,000 BTU Pool and Spa Heater
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Our take on the Hayward Universal H-Series H350FDN 350,000 BTU Pool and Spa Heater
The Hayward Universal H-Series H350FDN is a natural gas pool and spa heater rated at 350,000 BTU, built for medium to large inground pools and attached spas. It uses a cupro nickel heat exchanger, which holds up better against corrosive or low-pH water than copper, and reaches 83–84 percent thermal efficiency with low NOx emissions. It is about 25 percent lighter than earlier Hayward heaters, and its dual-voltage board simplifies retrofits. No current price was provided, so check the live comparison for today's best store price against its recent range.
- 350,000 BTU heats a large pool quickly
- Cupro nickel exchanger resists corrosive water
- 83–84 percent thermal efficiency
- Low NOx emissions meet many air-quality rules
- About 25 percent lighter, easier to install
- Dual-voltage board fits existing wiring
Hayward Universal H-Series H350FDN 350,000 BTU Pool and Spa Heater prices at every store
- Pool ExpressCheck price at Pool Express
Hayward Universal H-Series H350FDN 350,000 BTU Pool and Spa Heater price history
Lowest price we've seen: $3,999.00 on Nov 7 at Pool Express. Tracked across 1 store since Nov 7.
What reviewers say
Owners of the Universal H-Series generally report fast heat-up and steady performance, and installers like the lighter cabinet and flexible plumbing connections. Complaints center on the cost of repairs and on failures traced to water chemistry or improper venting.
- Heat outputPraisedOwners say 350,000 BTU warms a large pool quickly and holds temperature well.
- Heat exchangerPraisedThe cupro nickel exchanger is seen as more durable in corrosive or low-pH water than copper.
- InstallationMixedInstallers like the lighter cabinet and 2-inch connections, but the gas and venting work is a pro job.
Questions and answers
- Is the H350FDN big enough for my pool?
- At 350,000 BTU it suits medium to large inground pools, roughly up to 1,000 square feet of surface in a moderate climate. Smaller pools can use a lower-BTU model and save on gas line sizing.
- Does it run on propane?
- No. The H350FDN is a natural gas model. Hayward sells propane versions under different model numbers, so match the model to your fuel supply.
- What makes the cupro nickel exchanger different?
- Cupro nickel resists corrosion from low-pH or high-chlorine water better than standard copper. It still needs balanced chemistry; it is not immune to scale or bad water.
- Can I install it myself?
- Plan on a licensed installer. It needs a gas line sized for 350,000 BTU, correct venting, and 2-inch plumbing connections, and local codes usually require a permit.
- When is the price lowest?
- Pool heater prices tend to dip in fall and winter, outside swim season. Check the price history on this page to see where the current offer sits.
