{"product_id":"pentair-460805-mastertemp-400hd-400k-btu-natural-gas-heater","title":"Pentair 460805 MasterTemp 400HD 400K BTU Natural Gas Heater.","description":"\u003cp data-start=\"219\" data-end=\"295\"\u003e\u003cspan class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\"\u003eThe Pentair 460805 MasterTemp 400HD is a high-performance natural gas heater engineered for pools and spas requiring rapid heating and long-term durability. With a robust cupro-nickel heat exchanger, it excels in harsh water conditions, including low pH and high flow environments. Its compact design ensures minimal space usage, while the rustproof exterior withstands outdoor elements.\u003c\/span\u003e\u003c\/p\u003e\n\u003chr data-start=\"297\" data-end=\"300\"\u003e\n\u003ch3 data-start=\"302\" data-end=\"318\"\u003eKey Features\u003c\/h3\u003e\n\u003cul data-start=\"320\" data-end=\"847\"\u003e\n\u003cli data-start=\"320\" data-end=\"388\"\u003e\n\u003cp data-start=\"322\" data-end=\"388\"\u003e\u003cstrong data-start=\"322\" data-end=\"348\"\u003eHigh Heating Capacity:\u003c\/strong\u003e \u003cspan class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\"\u003eDelivers 400,000 BTUs for quick heating of pools and spas.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"389\" data-end=\"463\"\u003e\n\u003cp data-start=\"391\" data-end=\"463\"\u003e\u003cstrong data-start=\"391\" data-end=\"423\"\u003eCupro-Nickel Heat Exchanger:\u003c\/strong\u003e \u003cspan class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\"\u003eOffers superior resistance to corrosion and scale buildup.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"464\" data-end=\"529\"\u003e\n\u003cp data-start=\"466\" data-end=\"529\"\u003e\u003cstrong data-start=\"466\" data-end=\"489\"\u003eSmart Connectivity:\u003c\/strong\u003e \u003cspan class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\"\u003eIntegrates with Pentair Automation Systems for remote monitoring and control.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"530\" data-end=\"594\"\u003e\n\u003cp data-start=\"532\" data-end=\"594\"\u003e\u003cstrong data-start=\"532\" data-end=\"554\"\u003eEnergy Efficiency:\u003c\/strong\u003e \u003cspan class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\"\u003eCertified for low NOx emissions, meeting eco-friendly standards.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"595\" data-end=\"665\"\u003e\n\u003cp data-start=\"597\" data-end=\"665\"\u003e\u003cstrong data-start=\"597\" data-end=\"625\"\u003eUser-Friendly Interface:\u003c\/strong\u003e \u003cspan class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\"\u003eFeatures a rotating digital display for easy operation and diagnostics.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"666\" data-end=\"733\"\u003e\n\u003cp data-start=\"668\" data-end=\"733\"\u003e\u003cstrong data-start=\"668\" data-end=\"693\"\u003eDurable Construction:\u003c\/strong\u003e \u003cspan class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\"\u003eCompact, rustproof exterior suitable for both indoor and outdoor installations.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"734\" data-end=\"847\"\u003e\n\u003cp data-start=\"736\" data-end=\"847\"\u003e\u003cstrong data-start=\"736\" data-end=\"768\"\u003eOptional Smart Bypass Valve:\u003c\/strong\u003e \u003cspan class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\"\u003eReduces operational costs by diverting water flow when the heater isn't needed.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"849\" data-end=\"852\"\u003e\n\u003cdiv class=\"_tableContainer_16hzy_1\"\u003e\n\u003cdiv class=\"_tableWrapper_16hzy_14 group flex w-fit flex-col-reverse\" tabindex=\"-1\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp data-start=\"1920\" data-end=\"1998\"\u003e\u003cspan class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\"\u003eThe Pentair 460805 MasterTemp 400HD Heater stands out for its combination of high performance, durability, and smart features, making it a top choice for pool and spa owners seeking efficient heating solutions.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eSupplied under part number 460805 for exact-match ordering.\u003c\/li\u003e\n\u003cli\u003eBTU rating: 400K BTU.\u003c\/li\u003e\n\u003cli\u003eSized by BTU output — match the rating and fuel type to your existing unit.\u003c\/li\u003e\n\u003cli\u003eShips from our US warehouse with tracking on dispatch.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Pentair\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer part number:\u003c\/strong\u003e 460805\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Pool Heaters\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCondition:\u003c\/strong\u003e New\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBTU rating:\u003c\/strong\u003e 400K BTU\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC \/ GTIN:\u003c\/strong\u003e 788379745479\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eWhat part number is this pool heater?\u003c\/h3\u003e\n\u003cp\u003eThis item is supplied under part number 460805. Match that number against your equipment's parts diagram before ordering.\u003c\/p\u003e\n\u003ch3\u003eDoes the BTU rating have to match my old heater?\u003c\/h3\u003e\n\u003cp\u003eThe BTU rating should match or exceed your previous heater. Undersizing means the pool never reaches temperature on cold days; oversizing costs more up front but heats faster and cycles less.\u003c\/p\u003e\n\u003ch3\u003eCan this run on propane instead of natural gas?\u003c\/h3\u003e\n\u003cp\u003eNo. Gas pool heaters are built for one fuel and require a manufacturer conversion kit to change. Check the data plate on your existing unit and order the matching fuel type.\u003c\/p\u003e\n\u003ch3\u003eWhat size heater do I need for my pool?\u003c\/h3\u003e\n\u003cp\u003eA common rule is 1 BTU per gallon as a minimum, increased for windy sites, uncovered pools, or cold climates. A 20,000 gallon pool typically starts at 250,000 BTU.\u003c\/p\u003e\n\u003ch3\u003eDo I need a professional to install a pool heater?\u003c\/h3\u003e\n\u003cp\u003eGas heaters involve gas line sizing, venting and electrical connections, and most jurisdictions require a licensed installer plus a permit. Improper installation voids the manufacturer warranty.\u003c\/p\u003e\n\u003ch3\u003eHow do I confirm this part fits my equipment?\u003c\/h3\u003e\n\u003cp\u003eCheck the part number stamped on the component you are replacing, or find it on the parts schematic in your owner's manual. If the number differs or is unreadable, send us your equipment model and serial number and we will verify fitment before you order.\u003c\/p\u003e\n\u003ch3\u003eHow quickly does this ship?\u003c\/h3\u003e\n\u003cp\u003eIn-stock items ship from our US warehouse on business days. You will receive tracking by email once the order leaves the warehouse.\u003c\/p\u003e\n\u003ch3\u003eCan I return it if I ordered the wrong part?\u003c\/h3\u003e\n\u003cp\u003eUnopened, uninstalled items can be returned within 30 days. Equipment that has been installed or plumbed cannot be returned, so confirm fitment before installation.\u003c\/p\u003e\n\u003ch3\u003eIs this covered by a warranty?\u003c\/h3\u003e\n\u003cp\u003eManufacturer warranty terms vary by brand and product. Warranty claims generally require proof of purchase and, on installed equipment, evidence of professional installation.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Pentair","offers":[{"title":"Default Title","offer_id":54193884791148,"sku":"460805","price":3879.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1000\/0872\/2796\/files\/Screenshot2025-11-17000603_97818eeb-4dcb-4047-9eb4-031f0fbfb9ed.png?v=1786833364","url":"https:\/\/poolsupplyharbor.com\/products\/pentair-460805-mastertemp-400hd-400k-btu-natural-gas-heater","provider":"Pool Supply Harbor","version":"1.0","type":"link"}