{"product_id":"hayward-fdxlhxa1350-heat-exchanger-assembly-h350fd-universal-h-series","title":"Hayward FDXLHXA1350 Heat Exchanger Assembly, H350FD Universal H-Series, 350K BTU","description":"\n\u003cstyle\u003e\n  .hayhx350-wrap, .hayhx350-wrap * { box-sizing: border-box; }\n  .hayhx350-wrap {\n    font-family: -apple-system, BlinkMacSystemFont, \"Segoe UI\", Roboto, Helvetica, Arial, sans-serif;\n    color: #1a1a1a;\n    line-height: 1.6;\n  }\n\n  \/* Hero *\/\n  .hayhx350-hero {\n    background: linear-gradient(135deg, #b22222 0%, #f57c2b 100%);\n    color: #fff;\n    padding: 60px 40px;\n    border-radius: 16px;\n    text-align: center;\n    margin-bottom: 40px;\n  }\n  .hayhx350-hero h1 { font-size: 2.8em; margin: 0 0 12px; font-weight: 800; letter-spacing: -0.02em; }\n  .hayhx350-tagline { font-size: 1.25em; opacity: 0.95; margin: 0 0 28px; }\n  .hayhx350-badges { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; }\n  .hayhx350-badge {\n    background: rgba(255,255,255,0.18);\n    backdrop-filter: blur(10px);\n    -webkit-backdrop-filter: blur(10px);\n    border: 1px solid rgba(255,255,255,0.3);\n    color: #fff;\n    padding: 10px 20px;\n    border-radius: 50px;\n    font-size: 0.95em;\n    font-weight: 600;\n  }\n\n  \/* Intro *\/\n  .hayhx350-intro {\n    max-width: 850px;\n    margin: 0 auto 40px;\n    text-align: center;\n    font-size: 1.1em;\n    color: #333;\n  }\n\n  \/* Stat strip *\/\n  .hayhx350-stats {\n    background: linear-gradient(135deg, #5a0f0f 0%, #b22222 100%);\n    color: #fff;\n    border-radius: 16px;\n    padding: 32px;\n    display: grid;\n    grid-template-columns: repeat(5, 1fr);\n    gap: 16px;\n    margin-bottom: 48px;\n  }\n  .hayhx350-stat { text-align: center; 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}\n    .hayhx350-stats { grid-template-columns: repeat(2, 1fr); }\n    .hayhx350-feature { grid-template-columns: 1fr; }\n    .hayhx350-feature.hayhx350-reverse .hayhx350-feature-visual { order: 0; }\n  }\n\u003c\/style\u003e\n\n\u003cdiv class=\"hayhx350-wrap\"\u003e\n\n  \u003csection class=\"hayhx350-hero\"\u003e\n    \u003ch1\u003eHayward FDXLHXA1350 Heat Exchanger Assembly, H350FD Universal H-Series\u003c\/h1\u003e\n    \u003cp class=\"hayhx350-tagline\"\u003eBring the H350FD back to full fire.\u003c\/p\u003e\n    \u003cdiv class=\"hayhx350-badges\"\u003e\n      \u003cspan class=\"hayhx350-badge\"\u003eAuthorized Hayward Dealer\u003c\/span\u003e\u003cspan class=\"hayhx350-badge\"\u003eFree Shipping\u003c\/span\u003e\u003cspan class=\"hayhx350-badge\"\u003eCupro-Nickel Construction\u003c\/span\u003e\u003cspan class=\"hayhx350-badge\"\u003eGenuine OEM Part\u003c\/span\u003e\n    \u003c\/div\u003e\n  \u003c\/section\u003e\n\n  \u003cp class=\"hayhx350-intro\"\u003eThe \u003cstrong\u003eHayward FDXLHXA1350 Heat Exchanger Assembly (PST-FDXLHXA1350)\u003c\/strong\u003e is the genuine OEM replacement bundle for the \u003cstrong\u003eH350FD Universal H-Series Low NOx\u003c\/strong\u003e pool and spa heater, complete with the cupro-nickel finned tube, header end caps, gaskets, and hardware needed to put a 350,000 BTU heater back into service. It bolts into the existing cabinet using the original 2 in x 2.5 in CPVC union connections, so your manifold, gas train, and electrical do not need to move. If your H350FD is leaking from a corroded tube, ghosting heat to the cabinet, or throwing flow faults from a clogged exchanger, this is the part that restores it.\u003c\/p\u003e\n\n  \u003csection class=\"hayhx350-stats\"\u003e\n    \u003cdiv class=\"hayhx350-stat\"\u003e\n\u003cdiv class=\"hayhx350-stat-value\"\u003e350K\u003c\/div\u003e\n\u003cdiv class=\"hayhx350-stat-label\"\u003eBTU\/hr\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hayhx350-stat\"\u003e\n\u003cdiv class=\"hayhx350-stat-value\"\u003eCupro-Nickel\u003c\/div\u003e\n\u003cdiv class=\"hayhx350-stat-label\"\u003eTube Material\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hayhx350-stat\"\u003e\n\u003cdiv class=\"hayhx350-stat-value\"\u003e2 x 2.5\"\u003c\/div\u003e\n\u003cdiv class=\"hayhx350-stat-label\"\u003eCPVC Unions\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hayhx350-stat\"\u003e\n\u003cdiv class=\"hayhx350-stat-value\"\u003e48.5 lb\u003c\/div\u003e\n\u003cdiv class=\"hayhx350-stat-label\"\u003eShip Weight\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hayhx350-stat\"\u003e\n\u003cdiv class=\"hayhx350-stat-value\"\u003eH350FD\u003c\/div\u003e\n\u003cdiv class=\"hayhx350-stat-label\"\u003eFits Heater\u003c\/div\u003e\n\u003c\/div\u003e\n  \u003c\/section\u003e\n\n  \n  \u003csection class=\"hayhx350-feature\"\u003e\n    \u003cdiv class=\"hayhx350-visual hayhx350-feature-visual\"\u003e\n      \u003cspan class=\"hayhx350-visual-icon\"\u003e🔥\u003c\/span\u003e\n      \u003cspan class=\"hayhx350-visual-label\"\u003eCupro-Nickel Core\u003c\/span\u003e\n    \u003c\/div\u003e\n    \u003cdiv\u003e\n      \u003ch3\u003eGenuine \u003cspan class=\"hayhx350-accent\"\u003eCupro-Nickel\u003c\/span\u003e  Core\u003c\/h3\u003e\n      \u003cp\u003eYou get Hayward's \u003cstrong\u003ecupro-nickel finned tube assembly\u003c\/strong\u003e, the same heat exchanger the H350FD shipped with from the factory. Cupro-nickel resists the pitting, etching, and stress cracking that kill copper exchangers in salt pools, high-flow systems, and water that drifts low on pH or high on chlorine. This is the upgrade material across the Universal H-Series line, and it is what keeps the next exchanger from failing the same way the last one did.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/section\u003e\n  \n  \u003csection class=\"hayhx350-feature hayhx350-reverse\"\u003e\n    \u003cdiv class=\"hayhx350-visual hayhx350-visual-light hayhx350-feature-visual\"\u003e\n      \u003cspan class=\"hayhx350-visual-icon\"\u003e🧰\u003c\/span\u003e\n      \u003cspan class=\"hayhx350-visual-label\"\u003eDirect Fit\u003c\/span\u003e\n    \u003c\/div\u003e\n    \u003cdiv\u003e\n      \u003ch3\u003eDrop-In for the \u003cspan class=\"hayhx350-accent\"\u003eH350FD\u003c\/span\u003e  Cabinet\u003c\/h3\u003e\n      \u003cp\u003eThe FDXLHXA1350 is sized exactly to the H350FD forced-draft cabinet, with the correct header height, tube length, and burner tray clearance. You reuse your existing \u003cstrong\u003e2 in by 2.5 in CPVC unions\u003c\/strong\u003e, gas valve, blower, and ignition control, so a swap is a header-side job, not a full re-plumb. If your rating plate shows an \u003cstrong\u003eFD\u003c\/strong\u003e in the model number and a 350K BTU input, this is the matched assembly.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/section\u003e\n  \n  \u003csection class=\"hayhx350-feature\"\u003e\n    \u003cdiv class=\"hayhx350-visual hayhx350-visual-dark hayhx350-feature-visual\"\u003e\n      \u003cspan class=\"hayhx350-visual-icon\"\u003e🧂\u003c\/span\u003e\n      \u003cspan class=\"hayhx350-visual-label\"\u003eSalt-Ready\u003c\/span\u003e\n    \u003c\/div\u003e\n    \u003cdiv\u003e\n      \u003ch3\u003eBuilt for \u003cspan class=\"hayhx350-accent\"\u003eSalt and Aggressive Water\u003c\/span\u003e\n\u003c\/h3\u003e\n      \u003cp\u003eHayward's Totally Managed Flow design moves water evenly across every tube, so you do not get hot spots and stagnant zones that eat through copper. Pair that with the cupro-nickel alloy and you have an exchanger that holds up to \u003cstrong\u003esalt chlorine generators\u003c\/strong\u003e, mineral systems, and the high-velocity flow that comes off variable-speed pumps. It is the right exchanger for any H350FD that runs on a salt cell or sees frequent shock dosing.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/section\u003e\n  \n\n  \u003csection class=\"hayhx350-section\"\u003e\n    \u003ch2\u003eWho It's For\u003c\/h2\u003e\n    \u003cdiv class=\"hayhx350-app-grid\"\u003e\n      \u003cdiv class=\"hayhx350-app-card\"\u003e\n\u003ch4\u003eH350FDN Natural Gas Heaters\u003c\/h4\u003e\n\u003cp\u003eReplaces the original exchanger in the \u003cstrong\u003eH350FDN\u003c\/strong\u003e natural gas variant of the Universal H-Series Low NOx 350K heater.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hayhx350-app-card\"\u003e\n\u003ch4\u003eH350FDP Propane Heaters\u003c\/h4\u003e\n\u003cp\u003eSame assembly used in the \u003cstrong\u003eH350FDP\u003c\/strong\u003e propane variant. The exchanger is shared across both fuel types in the H350FD family.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hayhx350-app-card\"\u003e\n\u003ch4\u003eSalt Pool Systems\u003c\/h4\u003e\n\u003cp\u003eThe cupro-nickel core is the recommended exchanger for pools running a salt chlorine generator, where copper exchangers see accelerated wear.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hayhx350-app-card\"\u003e\n\u003ch4\u003eResidential and Light Commercial\u003c\/h4\u003e\n\u003cp\u003eRestores both residential H350FD installs and the light-commercial spa and small commercial pool applications the H-Series is rated for.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/section\u003e\n\n  \u003csection class=\"hayhx350-section\"\u003e\n    \u003ch2\u003eWhy PST Customers Pick This\u003c\/h2\u003e\n    \u003cdiv class=\"hayhx350-feature-grid\"\u003e\n      \u003cdiv class=\"hayhx350-feature-card\"\u003e\n\u003cdiv class=\"hayhx350-emoji\"\u003e🔥\u003c\/div\u003e\n\u003ch5\u003eRestores Full 350K BTU\u003c\/h5\u003e\n\u003cp\u003eA leaking or scaled exchanger drops heat output and burner efficiency. Fresh tubes give the H350FD its full 350,000 BTU\/hr rating back.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hayhx350-feature-card\"\u003e\n\u003cdiv class=\"hayhx350-emoji\"\u003e🧂\u003c\/div\u003e\n\u003ch5\u003eSalt-Compatible Alloy\u003c\/h5\u003e\n\u003cp\u003eCupro-nickel holds up to the chloride exposure that comes off salt chlorine generators, so the next exchanger lasts in salt pools.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hayhx350-feature-card\"\u003e\n\u003cdiv class=\"hayhx350-emoji\"\u003e🌊\u003c\/div\u003e\n\u003ch5\u003eTotally Managed Flow\u003c\/h5\u003e\n\u003cp\u003eEngineered flow paths spread water evenly across every tube, preventing hot spots and the pinhole leaks they cause.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hayhx350-feature-card\"\u003e\n\u003cdiv class=\"hayhx350-emoji\"\u003e🔩\u003c\/div\u003e\n\u003ch5\u003eReuses Existing Unions\u003c\/h5\u003e\n\u003cp\u003eThe 2 in by 2.5 in CPVC unions, gas train, and electrical stay put. The swap happens at the header and tube bundle.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hayhx350-feature-card\"\u003e\n\u003cdiv class=\"hayhx350-emoji\"\u003e🛡️\u003c\/div\u003e\n\u003ch5\u003eGenuine Hayward OEM\u003c\/h5\u003e\n\u003cp\u003eBuilt to the original FDXL spec, so warranty coverage and parts compatibility on the heater are preserved.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hayhx350-feature-card\"\u003e\n\u003cdiv class=\"hayhx350-emoji\"\u003e⚙️\u003c\/div\u003e\n\u003ch5\u003eComplete Assembly\u003c\/h5\u003e\n\u003cp\u003eShips as the matched tube and header assembly Hayward specifies for the H350FD, not a bare-tube kit.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/section\u003e\n\n  \n  \u003cdiv class=\"hayhx350-warning\"\u003e\n    \u003ch4\u003eProfessional Installation Required\u003c\/h4\u003e\n    \u003cp\u003eThis is a gas-fired heat exchanger repair on a sealed combustion appliance. Gas connections, venting, and combustion setup must be handled by a licensed gas technician per \u003cstrong\u003eNFPA 54\u003c\/strong\u003e and the Hayward H-Series installation manual. Electrical bonding must follow \u003cstrong\u003eNEC Article 680\u003c\/strong\u003e. Improper reassembly can produce carbon monoxide, gas leaks, or scalding water temperatures. Hayward requires proof of installation by a certified technician to validate the heat exchanger factory warranty.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \n\n  \u003csection class=\"hayhx350-section\"\u003e\n    \u003ch2\u003eFull Specifications\u003c\/h2\u003e\n    \u003cdiv class=\"hayhx350-spec-grid\"\u003e\n      \u003cdiv class=\"hayhx350-spec-row\"\u003e\n\u003cspan class=\"hayhx350-spec-key\"\u003eManufacturer\u003c\/span\u003e\u003cspan class=\"hayhx350-spec-val\"\u003eHayward\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hayhx350-spec-row\"\u003e\n\u003cspan class=\"hayhx350-spec-key\"\u003eProduct Line\u003c\/span\u003e\u003cspan class=\"hayhx350-spec-val\"\u003eUniversal H-Series Low NOx\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hayhx350-spec-row\"\u003e\n\u003cspan class=\"hayhx350-spec-key\"\u003eModel \/ MPN\u003c\/span\u003e\u003cspan class=\"hayhx350-spec-val\"\u003eFDXLHXA1350\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hayhx350-spec-row\"\u003e\n\u003cspan class=\"hayhx350-spec-key\"\u003ePST SKU\u003c\/span\u003e\u003cspan class=\"hayhx350-spec-val\"\u003ePST-FDXLHXA1350\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hayhx350-spec-row\"\u003e\n\u003cspan class=\"hayhx350-spec-key\"\u003eUPC\u003c\/span\u003e\u003cspan class=\"hayhx350-spec-val\"\u003e610377073745\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hayhx350-spec-row\"\u003e\n\u003cspan class=\"hayhx350-spec-key\"\u003eProduct Type\u003c\/span\u003e\u003cspan class=\"hayhx350-spec-val\"\u003ePool Heater Heat Exchanger Assembly\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hayhx350-spec-row\"\u003e\n\u003cspan class=\"hayhx350-spec-key\"\u003eFits Heater Models\u003c\/span\u003e\u003cspan class=\"hayhx350-spec-val\"\u003eH350FDN (natural gas), H350FDP (propane)\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hayhx350-spec-row\"\u003e\n\u003cspan class=\"hayhx350-spec-key\"\u003eBTU Rating\u003c\/span\u003e\u003cspan class=\"hayhx350-spec-val\"\u003e350,000 BTU\/hr\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hayhx350-spec-row\"\u003e\n\u003cspan class=\"hayhx350-spec-key\"\u003eTube Material\u003c\/span\u003e\u003cspan class=\"hayhx350-spec-val\"\u003eCupro-Nickel\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hayhx350-spec-row\"\u003e\n\u003cspan class=\"hayhx350-spec-key\"\u003eHeader Style\u003c\/span\u003e\u003cspan class=\"hayhx350-spec-val\"\u003eForced Draft (FD) H-Series\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hayhx350-spec-row\"\u003e\n\u003cspan class=\"hayhx350-spec-key\"\u003ePlumbing Connection\u003c\/span\u003e\u003cspan class=\"hayhx350-spec-val\"\u003e2 in x 2.5 in CPVC Union\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hayhx350-spec-row\"\u003e\n\u003cspan class=\"hayhx350-spec-key\"\u003eFlow Design\u003c\/span\u003e\u003cspan class=\"hayhx350-spec-val\"\u003eTotally Managed Flow\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hayhx350-spec-row\"\u003e\n\u003cspan class=\"hayhx350-spec-key\"\u003eCompatible Water Types\u003c\/span\u003e\u003cspan class=\"hayhx350-spec-val\"\u003eFresh, salt chlorinated, mineral systems\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hayhx350-spec-row\"\u003e\n\u003cspan class=\"hayhx350-spec-key\"\u003eIncludes\u003c\/span\u003e\u003cspan class=\"hayhx350-spec-val\"\u003eHeat exchanger assembly with headers and gaskets\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hayhx350-spec-row\"\u003e\n\u003cspan class=\"hayhx350-spec-key\"\u003eShip Weight\u003c\/span\u003e\u003cspan class=\"hayhx350-spec-val\"\u003e48.5 lb\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hayhx350-spec-row\"\u003e\n\u003cspan class=\"hayhx350-spec-key\"\u003eCountry of Origin\u003c\/span\u003e\u003cspan class=\"hayhx350-spec-val\"\u003eMexico (verify on packaging)\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hayhx350-spec-row\"\u003e\n\u003cspan class=\"hayhx350-spec-key\"\u003eApplication\u003c\/span\u003e\u003cspan class=\"hayhx350-spec-val\"\u003eOEM replacement for failed or leaking H350FD exchanger\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hayhx350-spec-row\"\u003e\n\u003cspan class=\"hayhx350-spec-key\"\u003eInstallation\u003c\/span\u003e\u003cspan class=\"hayhx350-spec-val\"\u003eProfessional installation required for warranty\u003c\/span\u003e\n\u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/section\u003e\n\n  \u003csection class=\"hayhx350-section\"\u003e\n    \u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n    \n    \u003cdiv class=\"hayhx350-faq-card\"\u003e\n      \u003ch4\u003eHow do I know if the FDXLHXA1350 fits my heater?\u003c\/h4\u003e\n      \u003cp\u003eCheck the rating plate on the side of your Hayward heater. You need a model number that contains \u003cstrong\u003eH350FD\u003c\/strong\u003e, an \u003cstrong\u003eFD\u003c\/strong\u003e (forced draft) designation, and a \u003cstrong\u003e350,000 BTU\/hr\u003c\/strong\u003e input rating. Both \u003cstrong\u003eH350FDN\u003c\/strong\u003e (natural gas) and \u003cstrong\u003eH350FDP\u003c\/strong\u003e (propane) use this same exchanger assembly. If your heater is 250K or 400K, or shows IDL or ASME on the plate, this is the wrong part.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \n    \u003cdiv class=\"hayhx350-faq-card\"\u003e\n      \u003ch4\u003eWhat is the difference between the FDXLHXA1350 and the FDXLHXA1250 or FDXLHXA1400?\u003c\/h4\u003e\n      \u003cp\u003eThe last three digits track the BTU size of the heater they fit. The \u003cstrong\u003eFDXLHXA1250\u003c\/strong\u003e fits the 250K BTU H250FD, the \u003cstrong\u003eFDXLHXA1350\u003c\/strong\u003e fits the 350K BTU H350FD, and the \u003cstrong\u003eFDXLHXA1400\u003c\/strong\u003e fits the 400K BTU H400FD. They share the same family design but are sized to different cabinets and tube counts. Order by your heater's BTU rating, not by what looks close.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \n    \u003cdiv class=\"hayhx350-faq-card\"\u003e\n      \u003ch4\u003eDo I need a different exchanger for a salt pool?\u003c\/h4\u003e\n      \u003cp\u003eNo, this is the right exchanger for a salt pool. The FDXLHXA1350 uses \u003cstrong\u003ecupro-nickel\u003c\/strong\u003e, which is the alloy Hayward recommends for any pool running a salt chlorine generator. Copper exchangers on older non-FD heaters wear out fast in salt systems, but cupro-nickel holds up to chloride exposure and is the standard build for the H-Series.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \n    \u003cdiv class=\"hayhx350-faq-card\"\u003e\n      \u003ch4\u003eWhat does the kit include?\u003c\/h4\u003e\n      \u003cp\u003eYou get the complete \u003cstrong\u003eheat exchanger assembly\u003c\/strong\u003e with the cupro-nickel finned tube bundle, header end caps, and gaskets needed to seat the assembly in the H350FD cabinet. Burners, the burner tray, gas valve, ignition module, blower, and outer cabinet are not included, you reuse those from your existing heater.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \n    \u003cdiv class=\"hayhx350-faq-card\"\u003e\n      \u003ch4\u003eCan I install this myself?\u003c\/h4\u003e\n      \u003cp\u003eNo, and Hayward does not allow it. The H350FD is a gas-fired forced-draft heater with sealed combustion, and the exchanger swap requires breaking the gas connection, opening the combustion chamber, and re-pressure-testing the gas train per \u003cstrong\u003eNFPA 54\u003c\/strong\u003e. Hayward requires the work to be done by a licensed gas technician, and the factory exchanger warranty is voided without proof of professional installation. Bonding must also be verified per \u003cstrong\u003eNEC Article 680\u003c\/strong\u003e.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \n    \u003cdiv class=\"hayhx350-faq-card\"\u003e\n      \u003ch4\u003eWhat usually causes the original exchanger to fail?\u003c\/h4\u003e\n      \u003cp\u003eThe top three causes are \u003cstrong\u003echronic low pH\u003c\/strong\u003e that etches tube walls, \u003cstrong\u003elow flow\u003c\/strong\u003e from a clogged filter or undersized pump that overheats the exchanger, and \u003cstrong\u003eoff-season freeze damage\u003c\/strong\u003e when water is left in the heater. Replacing the exchanger without fixing the underlying water chemistry, flow rate, or winterization habit usually leads to the same failure on the new part within a season or two.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \n    \u003cdiv class=\"hayhx350-faq-card\"\u003e\n      \u003ch4\u003eIs this a genuine Hayward part?\u003c\/h4\u003e\n      \u003cp\u003eYes. PST is an authorized Hayward dealer and the FDXLHXA1350 ships as a \u003cstrong\u003egenuine Hayward OEM\u003c\/strong\u003e assembly with full warranty coverage when installed by a licensed technician. Aftermarket copies exist but typically use thinner copper or non-spec gaskets and will void your H-Series warranty.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \n  \u003c\/section\u003e\n\n  \u003csection class=\"hayhx350-cta\"\u003e\n    \u003ch2\u003eOrder the FDXLHXA1350 From PST\u003c\/h2\u003e\n    \u003cp\u003eAuthorized Hayward dealer. Get the genuine OEM heat exchanger for your H350FD, backed by PST's service team if you need help confirming the right part before your technician shows up.\u003c\/p\u003e\n    \u003cdiv class=\"hayhx350-perks\"\u003e\n      \u003cspan class=\"hayhx350-perk\"\u003eFree Shipping\u003c\/span\u003e\u003cspan class=\"hayhx350-perk\"\u003e30-Day Returns\u003c\/span\u003e\u003cspan class=\"hayhx350-perk\"\u003eHayward Warranty Backed\u003c\/span\u003e\u003cspan class=\"hayhx350-perk\"\u003eAuthorized Hayward Dealer\u003c\/span\u003e\n    \u003c\/div\u003e\n  \u003c\/section\u003e\n\n\u003c\/div\u003e\n","brand":"Hayward","offers":[{"title":"Default Title","offer_id":44002161918017,"sku":"PST-FDXLHXA1350","price":1672.8,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0633\/1623\/0209\/files\/PST-FDXLHXA1350.jpg?v=1780385371","url":"https:\/\/www.pstpoolsupplies.com\/products\/hayward-fdxlhxa1350-heat-exchanger-assembly-h350fd-universal-h-series","provider":"PST Pool Supplies","version":"1.0","type":"link"}