{"product_id":"pentair-461059-mastertemp-pool-spa-heater-125k-btu-natural-gas-high-performance-heating","title":"Pentair 461059 MasterTemp Pool \u0026 Spa Heater – 125K BTU Natural Gas, High-Performance Heating","description":"\u003cp data-start=\"636\" data-end=\"1021\"\u003eThe \u003cstrong data-start=\"640\" data-end=\"687\"\u003ePentair MasterTemp 461059 Pool \u0026amp; Spa Heater\u003c\/strong\u003e provides \u003cstrong data-start=\"697\" data-end=\"744\"\u003e125,000 BTU of reliable natural gas heating\u003c\/strong\u003e designed specifically for \u003cstrong data-start=\"771\" data-end=\"817\"\u003esmall to medium residential pools and spas\u003c\/strong\u003e. Built for energy-efficient operation and consistent performance, the MasterTemp series delivers fast warm-ups, quiet combustion cycles, and durable construction that stands up to outdoor environments.\u003c\/p\u003e \u003cp data-start=\"1023\" data-end=\"1367\"\u003eEquipped with a high-efficiency heat exchanger and intuitive digital temperature controls, the 461059 model delivers comfortable water warmth while optimizing fuel use. Its compact footprint and straightforward installation make it a great choice for tight equipment pads, retrofit projects, or adding heating capability where space is limited.\u003c\/p\u003e \u003ch2 data-start=\"1374\" data-end=\"1396\"\u003e\u003cstrong data-start=\"1377\" data-end=\"1394\"\u003e\u003cstrong data-start=\"640\" data-end=\"687\"\u003ePentair MasterTemp 461059 Pool \u0026amp; Spa Heater \u003c\/strong\u003eCompatibility\u003c\/strong\u003e\u003c\/h2\u003e \u003cul data-start=\"1397\" data-end=\"1934\"\u003e \u003cli data-start=\"1397\" data-end=\"1503\"\u003e \u003cp data-start=\"1399\" data-end=\"1503\"\u003eDesigned for \u003cstrong data-start=\"1412\" data-end=\"1456\"\u003enatural gas pool and spa heating systems\u003c\/strong\u003e using standard residential fuel connections.\u003c\/p\u003e \u003c\/li\u003e \u003cli data-start=\"1504\" data-end=\"1596\"\u003e \u003cp data-start=\"1506\" data-end=\"1596\"\u003eWorks with \u003cstrong data-start=\"1517\" data-end=\"1532\"\u003e2” plumbing\u003c\/strong\u003e common to most residential pool and spa heater installations.\u003c\/p\u003e \u003c\/li\u003e \u003cli data-start=\"1597\" data-end=\"1704\"\u003e \u003cp data-start=\"1599\" data-end=\"1704\"\u003eCompatible with \u003cstrong data-start=\"1615\" data-end=\"1645\"\u003ePentair automation systems\u003c\/strong\u003e including IntelliCenter®, EasyTouch®, and IntelliTouch®.\u003c\/p\u003e \u003c\/li\u003e \u003cli data-start=\"1705\" data-end=\"1835\"\u003e \u003cp data-start=\"1707\" data-end=\"1835\"\u003eSuitable as a \u003cstrong data-start=\"1721\" data-end=\"1743\"\u003edirect replacement\u003c\/strong\u003e for other 125K BTU natural gas heaters with similar plumbing and electrical requirements.\u003c\/p\u003e \u003c\/li\u003e \u003cli data-start=\"1836\" data-end=\"1934\"\u003e \u003cp data-start=\"1838\" data-end=\"1934\"\u003eIntegrates easily with variable-speed pumps, heaters, controllers, and pool automation setups.\u003c\/p\u003e \u003c\/li\u003e \u003c\/ul\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eSupplied under part number 461059 for exact-match ordering.\u003c\/li\u003e\n\u003cli\u003eBTU rating: 125K 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 461059\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 125K BTU\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC \/ GTIN:\u003c\/strong\u003e 788379859930\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping weight:\u003c\/strong\u003e 128 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 461059. 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 461059. 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