{"product_id":"pentair-461020-mastertemp-hd-pool-heater-250k-btu-natural-gas-asme-certified-commercial-heating","title":"Pentair 461020 MasterTemp HD Pool Heater – 250K BTU Natural Gas, ASME-Certified Commercial Heating","description":"\u003cp data-start=\"685\" data-end=\"1127\"\u003eThe \u003cstrong data-start=\"689\" data-end=\"733\"\u003ePentair MasterTemp HD Pool Heater 461020\u003c\/strong\u003e is a \u003cstrong data-start=\"739\" data-end=\"778\"\u003ecommercial-grade natural gas heater\u003c\/strong\u003e engineered to deliver \u003cstrong data-start=\"801\" data-end=\"856\"\u003e250,000 BTU of dependable, high-performance heating\u003c\/strong\u003e for demanding pool environments. Built to \u003cstrong data-start=\"899\" data-end=\"931\"\u003eASME certification standards\u003c\/strong\u003e, this model combines rugged construction, efficient combustion, and advanced control technology to provide consistent warmth, reduced fuel costs, and long service life in high-usage applications.\u003c\/p\u003e \u003cp data-start=\"1129\" data-end=\"1548\"\u003eWith a heavy-duty heat exchanger and intuitive digital control interface, the 461020 ensures rapid warm-up times, precise temperature management, and dependable performance—even under continuous or heavy load conditions. Its robust design and safety-minded features make it well-suited for facilities such as hotels, fitness centers, apartments, or large residential pools that require \u003cstrong data-start=\"1515\" data-end=\"1547\"\u003ecommercial-rated reliability\u003c\/strong\u003e.\u003c\/p\u003e \u003ch2 data-start=\"1555\" data-end=\"1577\"\u003e\u003cstrong data-start=\"1558\" data-end=\"1575\"\u003e\u003cstrong data-start=\"689\" data-end=\"733\"\u003ePentair MasterTemp HD Pool Heater 461020 \u003c\/strong\u003eCompatibility\u003c\/strong\u003e\u003c\/h2\u003e \u003cul data-start=\"1578\" data-end=\"2141\"\u003e \u003cli data-start=\"1578\" data-end=\"1670\"\u003e \u003cp data-start=\"1580\" data-end=\"1670\"\u003e\u003cstrong data-start=\"1580\" data-end=\"1598\"\u003eASME-certified\u003c\/strong\u003e for commercial and high-demand residential pool heating applications.\u003c\/p\u003e \u003c\/li\u003e \u003cli data-start=\"1671\" data-end=\"1763\"\u003e \u003cp data-start=\"1673\" data-end=\"1763\"\u003eDesigned for \u003cstrong data-start=\"1686\" data-end=\"1701\"\u003enatural gas\u003c\/strong\u003e fuel systems with the appropriate gas supply and regulator.\u003c\/p\u003e \u003c\/li\u003e \u003cli data-start=\"1764\" data-end=\"1856\"\u003e \u003cp data-start=\"1766\" data-end=\"1856\"\u003eWorks with \u003cstrong data-start=\"1777\" data-end=\"1818\"\u003estandard 2” pool plumbing connections\u003c\/strong\u003e found on most heater installations.\u003c\/p\u003e \u003c\/li\u003e \u003cli data-start=\"1857\" data-end=\"1964\"\u003e \u003cp data-start=\"1859\" data-end=\"1964\"\u003eCompatible with \u003cstrong data-start=\"1875\" data-end=\"1905\"\u003ePentair automation systems\u003c\/strong\u003e including IntelliCenter®, EasyTouch®, and IntelliTouch®.\u003c\/p\u003e \u003c\/li\u003e \u003cli data-start=\"1965\" data-end=\"2061\"\u003e \u003cp data-start=\"1967\" data-end=\"2061\"\u003eIntegrates with variable-speed pumps, modern filtration systems, and pool control platforms.\u003c\/p\u003e \u003c\/li\u003e \u003cli data-start=\"2062\" data-end=\"2141\"\u003e \u003cp data-start=\"2064\" data-end=\"2141\"\u003eIdeal as a replacement for other \u003cstrong data-start=\"2097\" data-end=\"2140\"\u003e250K BTU ASME-rated natural gas heaters\u003c\/strong\u003e.\u003c\/p\u003e \u003c\/li\u003e \u003c\/ul\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eSupplied under part number 461020 for exact-match ordering.\u003c\/li\u003e\n\u003cli\u003eBTU rating: 250K 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\u003ch2\u003eSpecifications\u003c\/h2\u003e\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 461020\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 250K BTU\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC \/ GTIN:\u003c\/strong\u003e 788379858261\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping weight:\u003c\/strong\u003e 144 lb\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003ch3\u003eWhat part number is this pool heater?\u003c\/h3\u003e\u003cp\u003eThis item is supplied under part number 461020. Match that number against your equipment's parts diagram before ordering.\u003c\/p\u003e\u003ch3\u003eDoes the BTU rating have to match my old heater?\u003c\/h3\u003e\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\u003ch3\u003eCan this run on propane instead of natural gas?\u003c\/h3\u003e\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\u003ch3\u003eWhat size heater do I need for my pool?\u003c\/h3\u003e\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\u003ch3\u003eDo I need a professional to install a pool heater?\u003c\/h3\u003e\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\u003ch3\u003eHow do I confirm this part fits my equipment?\u003c\/h3\u003e\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\u003ch3\u003eHow quickly does this ship?\u003c\/h3\u003e\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\u003ch3\u003eCan I return it if I ordered the wrong part?\u003c\/h3\u003e\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\u003ch3\u003eIs this covered by a warranty?\u003c\/h3\u003e\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\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What part number is this pool heater?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"This item is supplied under part number 461020. Match that number against your equipment's parts diagram before ordering.\"}},{\"@type\":\"Question\",\"name\":\"Does the BTU rating have to match my old heater?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The 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.\"}},{\"@type\":\"Question\",\"name\":\"Can this run on propane instead of natural gas?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. 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.\"}},{\"@type\":\"Question\",\"name\":\"What size heater do I need for my pool?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"A 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.\"}},{\"@type\":\"Question\",\"name\":\"Do I need a professional to install a pool heater?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Gas 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.\"}},{\"@type\":\"Question\",\"name\":\"How do I confirm this part fits my equipment?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Check 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.\"}},{\"@type\":\"Question\",\"name\":\"How quickly does this ship?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"In-stock items ship from our US warehouse on business days. You will receive tracking by email once the order leaves the warehouse.\"}},{\"@type\":\"Question\",\"name\":\"Can I return it if I ordered the wrong part?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Unopened, uninstalled items can be returned within 30 days. Equipment that has been installed or plumbed cannot be returned, so confirm fitment before installation.\"}},{\"@type\":\"Question\",\"name\":\"Is this covered by a warranty?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Manufacturer warranty terms vary by brand and product. Warranty claims generally require proof of purchase and, on installed equipment, evidence of professional installation.\"}}]}\u003c\/script\u003e","brand":"Pentair","offers":[{"title":"Default Title","offer_id":54196108198252,"sku":"461020","price":4566.84,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1000\/0872\/2796\/files\/461020_d8b33b6f-60b8-4735-9df4-96521a5059d0.png?v=1786836767","url":"https:\/\/poolsupplyharbor.com\/products\/pentair-461020-mastertemp-hd-pool-heater-250k-btu-natural-gas-asme-certified-commercial-heating","provider":"Pool Supply Harbor","version":"1.0","type":"link"}