{"product_id":"hayward-h400-gas-pool-heater","title":"Hayward H400 Gas Pool \u0026 Spa Heater - Universal H-Series H400FDAU - ~96 kW Output - Natural Gas","description":"\u003ch3\u003eHayward H400 Universal H-Series Gas Pool \u0026amp; Spa Heater - H400FDAU - Natural Gas (Australian Model)\u003c\/h3\u003e\n\u003cp\u003eThe Hayward H400FDAU produces \u003cstrong\u003e96.13 kW\u003c\/strong\u003e of heat output from a \u003cstrong\u003e422 MJ\/h\u003c\/strong\u003e natural gas input. It is the Australian 240 V 50 Hz version of Hayward’s Universal H-Series forced-draft gas heater, with a cupro-nickel heat exchanger, polymer headers and a digital control panel with separate pool and spa set points. The H400FDAU is the largest of the three Australian H-Series models, suited to large outdoor pools up to about 112 m² of surface area, swim-spa and pool combinations, and sites where fast heat-up matters.\u003c\/p\u003e\n\u003cp\u003eThis is the genuine Australian-market \u003cstrong\u003eH400FDAU\u003c\/strong\u003e model (the AU suffix on the data plate), rated for 240 V 50 Hz and supplied with Hayward’s Australian installation and owner’s manuals. It is not a 60 Hz US import.\u003c\/p\u003e\n\u003cdiv style=\"background:#E0F7FA;border:1px solid #bfeaf1;padding:14px 16px;margin:0 0 18px;border-radius:6px;\"\u003e\n\u003cp style=\"margin:0 0 8px;\"\u003e\u003cstrong\u003eFuel type:\u003c\/strong\u003e Natural Gas - model H400FDAU\u003c\/p\u003e\n\u003cp style=\"margin:0 0 8px;\"\u003e\u003cstrong\u003eOther sizes:\u003c\/strong\u003e \u003ca href=\"\/products\/hayward-h150-gas-heater\"\u003eH150FDAU (36 kW)\u003c\/a\u003e | \u003ca href=\"\/products\/hayward-h250-gas-pool-heater\"\u003eH250FDAU (60 kW)\u003c\/a\u003e. See the full \u003ca href=\"\/collections\/pool-spa-gas-heaters\"\u003egas pool and spa heater range\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp style=\"margin:0;\"\u003e\u003cstrong\u003eLPG (propane):\u003c\/strong\u003e the same heater runs on LPG once Hayward’s LPG conversion kit is fitted by a licensed gas fitter. Contact us before ordering if your site is on bottled gas.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border:1px solid #d9d9d9;padding:14px 16px;margin:0 0 18px;border-radius:6px;\"\u003e\n\u003ch3\u003eOfficial Hayward Australia Manuals \u0026amp; Brochure\u003c\/h3\u003e\n\u003cp style=\"margin:0 0 8px;\"\u003eAll documents below are hosted by Hayward and cover the Australian H150FDAU, H250FDAU and H400FDAU models unless noted.\u003c\/p\u003e\n\u003cul style=\"padding-left:20px;\"\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/commerce.hayward-pool-assets.com\/magento\/akeneo\/H250FDN\/manuals\/universal_h_series_installation_manual_aus_0734.pdf\" target=\"_blank\" rel=\"noopener\"\u003eService \u0026amp; Installation Manual (Australia)\u003c\/a\u003e - 52 pages: specifications, clearances, gas pipe sizing, water flow and bypass, wiring, pressure switch adjustment, fault codes and the parts breakdown\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/commerce.hayward-pool-assets.com\/magento\/akeneo\/H250FDN\/manuals\/universal_h_series_owners_manual_aus_9297.pdf\" target=\"_blank\" rel=\"noopener\"\u003eOwner’s Manual (Australia)\u003c\/a\u003e - control panel operation, water chemistry, seasonal start-up and shut-down, and the Hayward Pool Products Australia warranty terms\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/commerce.hayward-pool-assets.com\/magento\/akeneo\/H250FDN\/manuals\/universal_h_series_indoor_flue_install_357b.pdf\" target=\"_blank\" rel=\"noopener\"\u003eAustralian Indoor Flue Kit Instructions\u003c\/a\u003e - vertical termination flue kits for indoor installation (kit UHXNEGVT14001AU for this model)\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/commerce.hayward-pool-assets.com\/magento\/akeneo\/H250FDN\/manuals\/universal_h_series_h3bd_connection_instructions_7e0a.pdf\" target=\"_blank\" rel=\"noopener\"\u003eDontek Cool-Down Controller Connection Instructions\u003c\/a\u003e - Hayward’s wiring guide for a pump run-on timer on the Australian H-Series\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/commerce.hayward-pool-assets.com\/magento\/akeneo\/H250FDN\/literature\/LITUHSBRO23_Universal_H_Series_Brochure_DIGITAL_320f.pdf\" target=\"_blank\" rel=\"noopener\"\u003eUniversal H-Series Brochure\u003c\/a\u003e - Hayward’s international digital brochure (LITUHSBRO23). Figures in it are imperial and 60 Hz; use the Australian manual above for AU ratings\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/commerce.hayward-pool-assets.com\/magento\/akeneo\/H250FDN\/literature\/CuproNickelSellSheet_b2bc.pdf\" target=\"_blank\" rel=\"noopener\"\u003eCupro-Nickel Heat Exchanger Sheet\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/au.hayward.com\/universal-h-series-400-000-btu-natural-gas-low-nox-h400fdn.html\" target=\"_blank\" rel=\"noopener\"\u003eHayward Australia product page (H400)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/hayward-gas-heater-parts-list\"\u003eHayward H-Series spare parts list with exploded diagram\u003c\/a\u003e (H150FD, H250FD, H400FD)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003ch3\u003eWhy Buy From Us?\u003c\/h3\u003e\u003cul style=\"padding-left:20px;\"\u003e\n\u003cli\u003eAustralia’s largest spa parts retailer, with warehouses in VIC, NSW, QLD and WA\u003c\/li\u003e\n\u003cli\u003eEx-manufacturer gas heater technicians on staff, with over 20 years in gas pool and spa heating\u003c\/li\u003e\n\u003cli\u003eWe list the \u003ca href=\"\/products\/hayward-gas-heater-parts-list\"\u003egenuine Hayward H-Series spare parts range\u003c\/a\u003e with the exploded parts diagram, so the heater can be supported after the sale\u003c\/li\u003e\n\u003cli\u003eStraight answers on sizing and installation before you buy. Send us your pool or spa volume, surface area and location\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical Specifications*\u003c\/h3\u003e\u003ctable style=\"width:100%;border-collapse:collapse;font-size:14px;\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003eManufacturer model\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003eH400FDAU\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003eSeries\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003eHayward Universal H-Series, forced draft (FD), low NOx\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003eGas type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003eNatural Gas (convertible to LPG with Hayward conversion kit)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003eGas input\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e422 MJ\/h\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003eHeat output\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e96.13 kW\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003ePool surface area guide\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003eOutdoor pools up to 112 m² (Hayward Australia figure, 15 °C rise, 5.5 km\/h wind, up to 610 m elevation)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003eNatural gas inlet pressure\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e1.12 kPa minimum, 2.61 kPa maximum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003eNatural gas manifold pressure\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e0.45 to 0.50 kPa\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003eLPG inlet pressure (after conversion)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e2.24 kPa minimum, 3.24 kPa maximum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003eLPG manifold pressure (after conversion)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e1.70 to 1.75 kPa\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003eWater flow, min \/ max\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e115 \/ 475 L\/min (manual bypass valve required above 475 L\/min)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003eWater connections\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e50 mm or 63 mm CPVC union nipples (2 in x 2.5 in), left or right hand\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003eGas connection\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e20 mm (3\/4 in) at the gas valve\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003eHeat exchanger\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003eCupro-nickel finned tube, totally managed flow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003eHeaders\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003ePolymer with patented header by-pass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003eIgnition\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003eElectronic, no standing pilot\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003eControls\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003eDigital LED panel, Standby \/ Pool \/ Spa modes, set point 18 to 40 °C, 2-wire remote thermostat input\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003ePower supply\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e240 V AC 50 Hz single phase, plug and play, draws under 2 A (3.15 A slow-blow fuse)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003eInstallation\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003eOutdoor as supplied; indoor with Hayward Australian vertical termination flue kit UHXNEGVT14001AU\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003eAltitude\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003eUp to 610 m above sea level\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003eDimensions, W x D x H\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e930 x 750 x 610 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003ePackaged weight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e89 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003cp style=\"font-size:13px;color:#666;\"\u003e* Figures are taken from the Hayward Australia Service \u0026amp; Installation Manual (Rev E) and Hayward Australia product literature for the H400FDAU. Check the data plate on the heater for the ratings that apply to your unit.\u003c\/p\u003e\n\u003ch3\u003eGas Consumption\u003c\/h3\u003e\u003ctable style=\"width:100%;border-collapse:collapse;font-size:14px;\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003eGas input at full fire\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e422 MJ\/h\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003eApproximate metered volume\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e10.9 m³\/h\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003cp style=\"font-size:13px;color:#666;\"\u003eFigures are at full fire. The heater only draws this while it is actually calling for heat, so daily usage depends on how far below set point the water sits, the weather, and whether a cover is fitted. Natural gas is billed in megajoules in Australia, so the MJ\/h figure is the one your retailer charges against. The cubic-metre figure assumes 38.7 MJ\/m³, which varies a little between networks.\u003c\/p\u003e\n\u003ch3\u003eHeat-Up Time to Raise Water Temperature by 10 °C\u003c\/h3\u003e\u003cp\u003eCalculated from this model’s rated output of \u003cstrong\u003e96.13 kW\u003c\/strong\u003e.\u003c\/p\u003e\u003ctable style=\"width:100%;border-collapse:collapse;font-size:14px;\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003eWater volume\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003eTime for +10 °C\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e1,000 L\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e7 min\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e1,500 L\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e11 min\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e5,000 L\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e36 min\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e10,000 L\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e1 h 13 min\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e15,000 L\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e1 h 49 min\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e20,000 L\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e2 h 25 min\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e25,000 L\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e3 h 1 min\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e30,000 L\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e3 h 38 min\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e40,000 L\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e4 h 50 min\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e50,000 L\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e6 h 3 min\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e60,000 L\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e7 h 15 min\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e70,000 L\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e8 h 28 min\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e80,000 L\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e9 h 41 min\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e90,000 L\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e10 h 53 min\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e100,000 L\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e12 h 6 min\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003cdiv style=\"background:#FFF8E1;border:1px solid #f0e0a8;padding:12px 14px;margin:12px 0 0;border-radius:6px;font-size:13px;\"\u003e\n\u003cstrong\u003eThese times will vary, treat them as a best case.\u003c\/strong\u003e They are the pure thermodynamic figures: water volume x 4.186 kJ per kg per °C, divided by the heater’s rated output, with \u003cem\u003eno allowance for heat loss\u003c\/em\u003e. A pool or spa is losing heat the whole time you are adding it. Expect longer, sometimes much longer, depending on air temperature, wind, humidity, water surface area and above all whether a cover is fitted. An uncovered pool in cold or windy weather can take well over double these times. Use this table to compare models, not as a guarantee of performance on your site.\n\u003c\/div\u003e\n\u003ch3\u003eSizing - Hayward Australia Figures\u003c\/h3\u003e\u003cp style=\"margin-bottom:6px;\"\u003e\u003cstrong\u003eMaximum outdoor pool surface area:\u003c\/strong\u003e\u003c\/p\u003e\u003ctable style=\"width:100%;border-collapse:collapse;font-size:14px;\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003eH150FDAU\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003eH250FDAU\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003eH400FDAU\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003ePool surface area\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e42 m²\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e70 m²\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003e112 m²\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003cp style=\"font-size:13px;color:#666;\"\u003eBased on a 15 °C temperature rise, 5.5 km\/h average wind and an elevation of up to 610 m. For indoor pools, divide the pool surface area by 3 before reading the table.\u003c\/p\u003e\u003cp style=\"margin:12px 0 6px;\"\u003e\u003cstrong\u003eMinutes to raise a covered, insulated spa by 15 °C:\u003c\/strong\u003e\u003c\/p\u003e\u003ctable style=\"width:100%;border-collapse:collapse;font-size:14px;\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003eSpa volume\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003e750 L\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003e1,200 L\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003e1,500 L\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003e1,900 L\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003e2,300 L\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003e2,700 L\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003e3,000 L\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003e3,400 L\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003e3,800 L\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003eH150FDAU\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e25\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e37\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e50\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e62\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e75\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e87\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e100\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e112\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e125\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003eH250FDAU\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e15\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e22\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e30\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e37\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e45\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e52\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e60\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e67\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003eH400FDAU\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003e9\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003e14\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003e19\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003e23\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003e28\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003e33\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003e37\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003e42\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003e47\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003cp style=\"font-size:13px;color:#666;\"\u003eHayward Australia figures. Spa sizing is based on an insulated and covered spa. Always cover a spa when not in use to limit heat loss and evaporation.\u003c\/p\u003e\n\u003ch3\u003eStandard Features\u003c\/h3\u003e\u003cul style=\"padding-left:20px;\"\u003e\n\u003cli\u003eCupro-nickel heat exchanger as standard, for corrosion resistance in salt-chlorinated and chemically treated water\u003c\/li\u003e\n\u003cli\u003eTotally managed water flow: the same water velocity through every tube, for faster heating and longer heat exchanger life\u003c\/li\u003e\n\u003cli\u003ePatented polymer header by-pass, which Hayward quotes as cutting pump run time by up to 18% against less efficient heaters\u003c\/li\u003e\n\u003cli\u003eForced-draft combustion: the fan-driven burner keeps combustion stable in wind, so no high-wind stack is needed outdoors\u003c\/li\u003e\n\u003cli\u003eLow NOx burner\u003c\/li\u003e\n\u003cli\u003eDigital LED control with Standby, Pool and Spa modes and separate pool and spa set points (18 to 40 °C)\u003c\/li\u003e\n\u003cli\u003e2-wire remote thermostat input for third-party controllers and automation\u003c\/li\u003e\n\u003cli\u003eUniversal junction boxes on both sides, water connections can be plumbed left or right hand\u003c\/li\u003e\n\u003cli\u003eFront-panel-only access for service\u003c\/li\u003e\n\u003cli\u003eFault code display on the control panel\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eInstallation Requirements\u003c\/h3\u003e\u003cul style=\"padding-left:20px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eLicensed installation only.\u003c\/strong\u003e Must be installed and commissioned by a licensed gas fitter, to AS 5601.1 (gas installations), AS\/NZS 3000 (wiring) and local gas authority requirements. The installer must set the manifold pressure to the figure on the rating plate and provide a compliance certificate.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutdoor as supplied.\u003c\/strong\u003e Clearances: top unobstructed, 600 mm at the front, 150 mm at the rear, 300 mm on the water connection side and 150 mm on the opposite side. Do not install under an overhang that is less than 1 m above the top of the heater, under a deck, or within 600 mm of outdoor air conditioning equipment. Flue outlet clearances to windows, doors, walkways and building openings are per AS\/NZS 5601.1.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndoor installation\u003c\/strong\u003e requires Hayward’s Australian vertical termination flue kit (part UHXNEGVT14001AU, 200 mm (8 in) flue, maximum 12 m vertical run, maximum 6 m horizontal and three elbows). See the flue kit instructions linked above.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDistance from water.\u003c\/strong\u003e The heater is to be at least 3.5 m from the inside wall of the pool or spa unless separated from it by a solid barrier.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAltitude:\u003c\/strong\u003e rated for installation up to 610 m above sea level.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWater flow:\u003c\/strong\u003e minimum 115 L\/min, maximum 475 L\/min. If the pump and filter system can exceed 475 L\/min, a manual bypass valve must be fitted.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeater above or below water level:\u003c\/strong\u003e the water pressure switch must be adjusted at commissioning per the installation manual.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChlorinators and dosing systems\u003c\/strong\u003e must be installed downstream of the heater, lower than the heater, with a corrosion-resistant positive-seal check valve between the heater outlet and the chlorinator. Chemicals back-feeding into the heat exchanger will destroy it and void warranty. Never put chlorine tablets in the skimmer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eElectrical:\u003c\/strong\u003e plug and play 240 V 50 Hz supply. Bond the heater’s earth lug to the pool bonding system per AS\/NZS 3000.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWater Balance - Warranty Critical\u003c\/h3\u003e\u003cp\u003eIncorrect water balance is the most common cause of heat exchanger failure. Hayward’s warranty excludes leaks caused by acidic water (pH below 7.2) and by scale or sediment from high pH (above 7.8) or high hardness. Hayward’s recommended ranges:\u003c\/p\u003e\u003ctable style=\"width:100%;border-collapse:collapse;font-size:14px;\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003epH\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e7.4 to 7.6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003eTotal alkalinity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e80 to 120 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003eCalcium hardness\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e200 to 400 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003eSalt (salt-chlorinated pools)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e2,700 to 5,000 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003eFree chlorine\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e1 to 3 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003eBromine\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e2 to 4 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003cp style=\"font-size:13px;color:#666;\"\u003eTest the water at least weekly. Until the water is balanced, run the heater on bypass if one is fitted.\u003c\/p\u003e\n\u003ch3\u003ePump Run-On After Heating\u003c\/h3\u003e\u003cp\u003eIf the filtration pump stops the moment the heater shuts down, residual heat left in the heat exchanger can trip the manual-reset high limit switch. Hayward’s manual says to run the pump for 10 minutes after heater use, and Hayward publishes \u003ca href=\"https:\/\/commerce.hayward-pool-assets.com\/magento\/akeneo\/H250FDN\/manuals\/universal_h_series_h3bd_connection_instructions_7e0a.pdf\" target=\"_blank\" rel=\"noopener\"\u003econnection instructions for a Dontek cool-down timer\u003c\/a\u003e on the Australian H-Series (5 minute preset, no more than 10 minutes). If your pool controller has no cool-down mode, fit a run-on timer such as the \u003ca href=\"\/products\/gas-heater-cooldown-control\"\u003eDontek H5RO gas heater run-on controller\u003c\/a\u003e we stock.\u003c\/p\u003e\n\u003ch3\u003eControl Panel Fault Codes\u003c\/h3\u003e\u003cul style=\"padding-left:20px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eLO\u003c\/strong\u003e - limit string open while calling for heat (a pressure switch or temperature limit in the safety circuit). Restarts 2 minutes after the fault clears\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSF\u003c\/strong\u003e - thermistor fault, sensors disagree by 3 °C or more or read out of range\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHE\u003c\/strong\u003e - water temperature rising too fast through the heater (check water flow). Manual restart needed after the third occurrence\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHS\u003c\/strong\u003e - inlet water above 40 °C. Resumes once the water drops to 40 °C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003elo\u003c\/strong\u003e - limit string open with no call for heat, operation continues\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSb\u003c\/strong\u003e - keypad button held or stuck for more than 30 seconds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ebo\u003c\/strong\u003e - bypass operation mode, the heater is being controlled by a 2-wire remote thermostat (not a fault)\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp style=\"font-size:13px;color:#666;\"\u003eThe ignition control board has its own LED fault indication for ignition and flame faults. Both lists are in the Service \u0026amp; Installation Manual linked above.\u003c\/p\u003e\n\u003ch3\u003eWarranty\u003c\/h3\u003e\u003cul style=\"padding-left:20px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003e12 months\u003c\/strong\u003e from the date of purchase under the Hayward Pool Products (Australia) limited heater warranty, including the heat exchanger and headers. Full terms are in the Owner’s Manual linked above.\u003c\/li\u003e\n\u003cli\u003eHayward’s Australian warranty terms state that claims are recognised only where the heater has been installed by a technician approved by Hayward Pool Products, and that gas heater claims are handled directly by Hayward through its authorised service network on site, not by over-the-counter exchange. Read the terms before you buy and have the heater installed by a licensed gas fitter.\u003c\/li\u003e\n\u003cli\u003eHayward does not cover the additional costs of attending sites more than 20 km from an authorised Hayward service outlet.\u003c\/li\u003e\n\u003cli\u003eNot covered: damage from incorrect gas pressure or fuel, water chemistry (pH below 7.2 or above 7.8, scale, sediment), freezing, flooding or installation faults.\u003c\/li\u003e\n\u003cli\u003eHayward recommends annual maintenance by authorised personnel to keep the heater operating safely.\u003c\/li\u003e\n\u003cli\u003eYour rights under the Australian Consumer Law are not affected.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eShipping\u003c\/h3\u003e\u003cp\u003eAt 89 kg packaged this is a two-person lift. Someone may be required to help take the heater from the delivery truck if the carrier cannot provide a tailgate lifter. Check the carton for freight damage before signing.\u003c\/p\u003e\n\u003cp style=\"font-size:13px;color:#888;\"\u003eHayward H400 natural gas heater, Hayward H400FDAU, Hayward Universal H-Series H400FD Australia, Hayward H400 pool heater 96 kW, Hayward H400 spa heater, Hayward H-Series 422 MJ\/h gas heater, Hayward gas pool heater Australia 240 V 50 Hz. WWDG · SpaPro\u003c\/p\u003e","brand":"Hayward","offers":[{"title":"Default Title","offer_id":67667858096317,"sku":"1536361","price":6301.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0372\/5253\/files\/hayward-h400-gas-pool-spa-heater-universal-h-series-h400fdau-96-kw-output-natural-949.webp?v=1791340267","url":"https:\/\/hasp.com.au\/products\/hayward-h400-gas-pool-heater","provider":"Heater and Spa Parts","version":"1.0","type":"link"}