Pool Heater Recall: Is Your Heater Affected? (2026)

Quick answer

The only active pool heater recall right now is Hayward’s September 2026 recall of about 4,600 HDFS400 Universal-HC dual-fuel heaters over a carbon monoxide poisoning risk (CPSC recall 26-777) — a different model than the Hayward H400FDN this site recommends elsewhere, so most Hayward owners aren’t affected. Three older recalls also exist: Pentair’s 2021 StaRite/MasterTemp fire-hazard recall (about 4,700 units, limited to a narrow December 2020-January 2021 manufacturing window), a 2019 Hayward vent-kit carbon monoxide recall, and decades-older Pentair and Hayward recalls from 2003 and 2007. Check your heater’s nameplate model number and manufacture date against the list below — if it matches, stop using it and contact the manufacturer for a free repair.

The active recall: Hayward HDFS400 (September 2026)

The Consumer Product Safety Commission posted this recall on September 17, 2026. According to the official CPSC notice, the hazard is straightforward: the HDFS400 can produce high levels of carbon monoxide during normal operation, posing a risk of serious injury or death.

The CPSC’s identification guide for the recalled unit: a brown body with a black top, roughly 21 in. long by 28 in. wide by 31 in. high, a digital display control panel on top, a molded base with integrated tie-down connections, and a nameplate below the vent reading “HDFS400” above the Hayward name. If your heater matches, stop using it and contact Hayward at 855-500-5288 (8 a.m.-5 p.m. ET, Monday-Friday), email [email protected], or visit hayward.com/productrecall.

The honesty-hook most coverage of this recall skips: the HDFS400 is a dual-fuel unit sold mainly through commercial channels (distributors, builders, service pros), not the same product as the Hayward Universal H-Series H400FDN natural-gas-only heater this site and most retail listings recommend. Same 400,000 BTU rating, same brand, different model line and fuel design. If your nameplate reads H400FDN, H150FDN, or HP21405T, you are not part of this recall — only the specific HDFS400 model number is affected.

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Past pool heater recalls (2003-2021)

Pool heater recalls are infrequent but not unprecedented, and they cluster around the same two hazards: carbon monoxide leaks and gas-connection fire risk.

The 2021 Pentair recall covered 16 specific StaRite and MasterTemp model numbers, including early HTR 400 MASTERTEMP and POOL HTR 400K variants of the same MasterTemp 400 line this site covers — but only units manufactured between December 22, 2020, and January 6, 2021, a three-week window. A MasterTemp 400 bought new today, or even a used one from outside that date range, was never part of the recall. If you’re buying a used Pentair heater from that era, check the serial sticker’s manufacture date against that window before assuming it’s clear — our Hayward vs. Pentair comparison covers both brands’ current, non-recalled lineups.

How to check if your pool heater is recalled

1. Find the nameplate. It’s typically mounted near the vent or control panel and lists the brand, model number, and serial number/manufacture date.
2. Search the model number at cpsc.gov/Recalls or SaferProducts.gov, which indexes every CPSC recall going back decades.
3. Call the manufacturer directly using the number from the official CPSC notice, not a number you find through a general web search — recall scam calls referencing real product names are common.
4. Check the manufacture date against the recalled window, if one is listed. Several recalls (like Pentair’s 2021 fire-hazard recall) only cover units built during a specific multi-week production run, not every unit with that model number ever sold.

What happens if your heater is recalled

Every pool heater recall listed above resolved the same way: stop using the unit immediately, then the manufacturer sends a technician for a free inspection and repair. None has required a refund, replacement unit, or disposal — the fix has always been a parts-level correction (a vent kit, a gas connection, a circuit board) rather than scrapping the heater. Hayward reports that more than 90% of registered HDFS400 owners had already completed the free repair as of the September 2026 announcement, well before most public coverage even ran.

The bottom line

As of October 2026, only one pool heater recall is active: Hayward’s HDFS400 Universal-HC dual-fuel unit, a commercial-channel model distinct from the Universal H-Series H400FDN this site recommends for most in-ground pools. If your nameplate doesn’t read “HDFS400,” you’re not affected by the current recall. Older Pentair and Hayward recalls from 2003-2021 are all closed, narrow-window events — worth checking if you’re buying a used heater from that era, but not a reason to worry about a heater bought new today. When in doubt, search your exact model and serial number at cpsc.gov/Recalls rather than relying on brand reputation alone.

Sources: CPSC — Hayward Industries Recalls Universal Pool Heaters (Recall 26-777), CPSC — Pool Heaters Recalled by Pentair Water Pool and Spa Due to Fire Hazard (Recall 21-119), CPSC — Hayward Industries Recalls Pool Heater Vent Kits (Recall 19-136), CPSC — Pentair Water Pool and Spa Recalls Gas Pool Heaters (2007)