{"product_id":"pentairmastertempasmeheaternaturalgas250asmehd250kbtu120240vac144lbs461020pen461020","title":"Pentair MasterTemp ASME Heater Natural Gas, 250 ASME HD, 250K BTU | 461020","description":"\u003ch2\u003eProduct Overview\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eThe Pentair 461020 MasterTemp ASME 250 HD Pool and Spa Heater is a commercial-grade natural gas heater designed to deliver fast, efficient heating for demanding pool and spa applications.\u003c\/strong\u003e With a \u003cstrong\u003e250,000 BTU input rating\u003c\/strong\u003e, this heater provides dependable heating performance in a compact, quiet, and user-friendly design.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBuilt with a heavy-duty cupro-nickel heat exchanger and ASME-certified construction, the MasterTemp 250 ASME HD is made for commercial and high-use applications where durability, corrosion resistance, and reliable performance are essential.\u003c\/strong\u003e It is commonly used for commercial pools, spas, apartments, condos, hotels, motels, schools, parks, and high-end residential pool systems.\u003c\/p\u003e\n\u003ch2\u003eIdeal For\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eThis heater is ideal for commercial pool operators, pool builders, service professionals, and property owners who need a durable 250K BTU natural gas heater with ASME certification and heavy-duty cupro-nickel performance.\u003c\/strong\u003e It is especially useful for high-use pools, chemically demanding water conditions, saltwater systems, and installations requiring commercial-grade heater construction.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003ch3\u003e250,000 BTU Heating Performance\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eProvides 250,000 BTU of natural gas heating power for fast pool and spa temperature recovery.\u003c\/strong\u003e This makes it suitable for many commercial, semi-commercial, and demanding residential pool and spa applications.\u003c\/p\u003e\n\u003ch3\u003eASME-Certified Heavy-Duty Construction\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eBuilt to ASME standards for commercial-grade heater applications.\u003c\/strong\u003e ASME certification is commonly required for many commercial pool and spa installations, depending on local code and facility requirements.\u003c\/p\u003e\n\u003ch3\u003eCupro-Nickel Heat Exchanger\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eThe heavy-duty cupro-nickel heat exchanger provides enhanced corrosion resistance compared with standard copper designs.\u003c\/strong\u003e This is especially beneficial for saltwater pools, high-use facilities, low pH conditions, high flow applications, and more demanding water environments.\u003c\/p\u003e\n\u003ch3\u003eNatural Gas Operation\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDesigned for natural gas fuel supply.\u003c\/strong\u003e Always verify the property’s gas type, gas pressure, gas line sizing, and installation requirements before purchase or installation.\u003c\/p\u003e\n\u003ch3\u003eDigital IID Control System\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eThe digital IID electronic ignition system provides reliable startup and user-friendly operation.\u003c\/strong\u003e Indicator lights and digital controls help simplify heater monitoring, service, and troubleshooting.\u003c\/p\u003e\n\u003ch3\u003e120 \/ 240 VAC Electrical Compatibility\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDesigned for 120 \/ 240 VAC electrical operation.\u003c\/strong\u003e This supports installation flexibility when matched to the correct electrical configuration by a qualified professional.\u003c\/p\u003e\n\u003ch3\u003eLow NOx Certified Design\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eThe MasterTemp ASME HD heater is designed for low NOx emissions while delivering strong heating performance.\u003c\/strong\u003e This makes it suitable for many areas with air-quality requirements, subject to local code approval.\u003c\/p\u003e\n\u003ch3\u003eCompact and Quiet Design\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eMasterTemp heaters are known for their compact footprint and quiet operation.\u003c\/strong\u003e The design helps save space on equipment pads while reducing operating noise around the pool area.\u003c\/p\u003e\n\u003ch2\u003eBenefits\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eThe Pentair 461020 MasterTemp ASME 250 HD heater provides reliable commercial-grade heating with the added durability of cupro-nickel construction.\u003c\/strong\u003e Its compact size, fast heat-up performance, digital controls, and ASME-certified design make it a strong option for pools and spas that require dependable heating in demanding conditions.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThis model is a practical choice for facilities that need a 250K BTU natural gas heater with commercial ASME certification and corrosion-resistant internal components.\u003c\/strong\u003e Professional installation is required because this heater uses natural gas, line-voltage electrical power, water plumbing, and may require venting depending on the installation location.\u003c\/p\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cdiv class=\"TyagGW_tableContainer\"\u003e\n\u003cdiv class=\"group TyagGW_tableWrapper flex flex-col-reverse w-fit\" tabindex=\"-1\"\u003e\n\u003ctable class=\"w-fit min-w-(--thread-content-width)\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth class=\"last:pe-10\"\u003eSpecification\u003c\/th\u003e\n\u003cth class=\"last:pe-10\"\u003eDetails\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eASME Pool \u0026amp; Spa Gas Heater\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003ePentair\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeries\u003c\/td\u003e\n\u003ctd\u003eMasterTemp ASME \/ MasterTemp HD\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel \/ Part Number\u003c\/td\u003e\n\u003ctd\u003e461020\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSKU\u003c\/td\u003e\n\u003ctd\u003e461020\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUPC \/ Barcode\u003c\/td\u003e\n\u003ctd\u003e788379858261\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBTU Input\u003c\/td\u003e\n\u003ctd\u003e250,000 BTU\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGas Type\u003c\/td\u003e\n\u003ctd\u003eNatural Gas\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIgnition Type\u003c\/td\u003e\n\u003ctd\u003eDigital IID \/ Electronic Ignition\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeat Exchanger \/ Tubing Material\u003c\/td\u003e\n\u003ctd\u003eHeavy-Duty Cupro-Nickel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCertification\u003c\/td\u003e\n\u003ctd\u003eASME\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage Rating\u003c\/td\u003e\n\u003ctd\u003e120 \/ 240 VAC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eCommercial and high-use pool and spa heating\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEmissions\u003c\/td\u003e\n\u003ctd\u003eLow NOx\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApproximate Weight\u003c\/td\u003e\n\u003ctd\u003e144 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommon Description\u003c\/td\u003e\n\u003ctd\u003e250 ASME HD Natural Gas Heater\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Condition\u003c\/td\u003e\n\u003ctd\u003eNew Equipment\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProfessional Installation\u003c\/td\u003e\n\u003ctd\u003eRequired\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch2\u003eCustomer-Facing Q\u0026amp;A\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is the BTU rating of the Pentair 461020 MasterTemp ASME heater?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e This model is rated at \u003cstrong\u003e250,000 BTU\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is this heater natural gas or propane?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The Pentair 461020 is a \u003cstrong\u003enatural gas\u003c\/strong\u003e heater.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is this an ASME-certified heater?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes. This is the \u003cstrong\u003eMasterTemp 250 ASME HD\u003c\/strong\u003e model, designed for commercial-grade ASME applications.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Does this heater have a cupro-nickel heat exchanger?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes. The 461020 is commonly listed with \u003cstrong\u003eheavy-duty cupro-nickel tubing \/ heat exchanger construction\u003c\/strong\u003e for added corrosion resistance.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What voltage does this heater use?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e This heater is listed for \u003cstrong\u003e120 \/ 240 VAC\u003c\/strong\u003e electrical operation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What type of ignition does it use?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e It uses a \u003cstrong\u003edigital IID electronic ignition\u003c\/strong\u003e system.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is this heater good for commercial pools?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes. This ASME HD model is commonly used for commercial and high-use pool and spa applications where ASME certification and heavy-duty construction are required.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can this heater be installed indoors?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Indoor installation may require approved venting, combustion air, clearances, and local code compliance. A qualified professional should verify installation requirements before purchase or installation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Should this heater be installed by a professional?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes. Professional installation is required because this heater involves natural gas, electrical wiring, plumbing, and possible venting requirements.\u003c\/p\u003e\n\u003c!--split--\u003e","brand":"Pentair","offers":[{"title":"Default Title","offer_id":52762848919862,"sku":"PEN461020 -H","price":3930.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0873\/1167\/9798\/files\/PEN461020_0.jpg?v=1755535889","url":"https:\/\/poolsupplydepot.net\/products\/pentairmastertempasmeheaternaturalgas250asmehd250kbtu120240vac144lbs461020pen461020","provider":"Pool Supply Depot","version":"1.0","type":"link"}