{"product_id":"pentair-460771-mastertemp-250k-asme-gas-heater","title":"Pentair | 460771 | 250K BTU MasterTemp  ASME Natural Gas Heater – Commercial Grade, 120\/240V","description":"\u003cp data-start=\"270\" data-end=\"579\"\u003e\u003cstrong data-start=\"270\" data-end=\"336\"\u003eThe Pentair 460771 MasterTemp ASME 250K BTU Natural Gas Heater\u003c\/strong\u003e is a high-performance, ASME-certified unit designed for commercial and high-demand residential pools and spas. With a heavy-duty build, advanced efficiency, and rapid heat-up times, it’s a reliable heating solution for year-round operation.\u003c\/p\u003e\n\u003chr data-start=\"581\" data-end=\"584\"\u003e\n\u003ch3 data-start=\"586\" data-end=\"608\"\u003e\u003cstrong data-start=\"590\" data-end=\"606\"\u003eKey Features\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul data-start=\"610\" data-end=\"1338\"\u003e\n\u003cli data-start=\"610\" data-end=\"716\"\u003e\n\u003cp data-start=\"612\" data-end=\"716\"\u003e\u003cstrong data-start=\"612\" data-end=\"644\"\u003e250,000 BTU Heating Capacity\u003c\/strong\u003e – Suitable for large residential and commercial pool\/spa applications\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"717\" data-end=\"797\"\u003e\n\u003cp data-start=\"719\" data-end=\"797\"\u003e\u003cstrong data-start=\"719\" data-end=\"737\"\u003eASME Certified\u003c\/strong\u003e – Meets commercial-grade safety and performance standards\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"798\" data-end=\"871\"\u003e\n\u003cp data-start=\"800\" data-end=\"871\"\u003e\u003cstrong data-start=\"800\" data-end=\"825\"\u003eNatural Gas Operation\u003c\/strong\u003e – Delivers consistent and efficient heating\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"872\" data-end=\"933\"\u003e\n\u003cp data-start=\"874\" data-end=\"933\"\u003e\u003cstrong data-start=\"874\" data-end=\"899\"\u003e120\/240V Dual Voltage\u003c\/strong\u003e – Flexible installation options\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"934\" data-end=\"1017\"\u003e\n\u003cp data-start=\"936\" data-end=\"1017\"\u003e\u003cstrong data-start=\"936\" data-end=\"963\"\u003eHeavy-Duty Construction\u003c\/strong\u003e – Built to handle high-demand, continuous operation\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1018\" data-end=\"1088\"\u003e\n\u003cp data-start=\"1020\" data-end=\"1088\"\u003e\u003cstrong data-start=\"1020\" data-end=\"1042\"\u003eFast Heat-Up Times\u003c\/strong\u003e – Quickly reaches desired water temperature\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1089\" data-end=\"1177\"\u003e\n\u003cp data-start=\"1091\" data-end=\"1177\"\u003e\u003cstrong data-start=\"1091\" data-end=\"1125\"\u003eCorrosion-Resistant Components\u003c\/strong\u003e – Prolongs heater life in harsh pool environments\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1178\" data-end=\"1247\"\u003e\n\u003cp data-start=\"1180\" data-end=\"1247\"\u003e\u003cstrong data-start=\"1180\" data-end=\"1201\"\u003eLow NOx Emissions\u003c\/strong\u003e – Meets stringent environmental regulations\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1248\" data-end=\"1313\"\u003e\n\u003cp data-start=\"1250\" data-end=\"1313\"\u003e\u003cstrong data-start=\"1250\" data-end=\"1270\"\u003eDigital Controls\u003c\/strong\u003e – Simple, precise temperature management\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1314\" data-end=\"1338\"\u003e\n\u003cp data-start=\"1316\" data-end=\"1338\"\u003e\u003cstrong data-start=\"1316\" data-end=\"1326\"\u003eWeight\u003c\/strong\u003e – 144 lbs\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1340\" data-end=\"1343\"\u003e\n\u003ch3 data-start=\"1345\" data-end=\"1371\"\u003e\u003cstrong data-start=\"1349\" data-end=\"1369\"\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"1372\" data-end=\"1734\"\u003eThe Pentair 460771 MasterTemp ASME 250K BTU Natural Gas Heater offers commercial-grade heating performance in a compact, highly efficient package. ASME certification ensures compliance with strict safety and performance requirements for commercial applications, making it ideal for hotels, fitness centers, municipal pools, and other high-demand installations.\u003c\/p\u003e\n\u003cp data-start=\"1736\" data-end=\"2007\"\u003eThis heater’s natural gas operation and heavy-duty components allow for reliable, continuous use, while the dual-voltage 120\/240V capability makes installation more versatile. Its rapid heat-up design minimizes downtime, ensuring warm water is always ready when needed.\u003c\/p\u003e\n\u003cp data-start=\"2009\" data-end=\"2274\"\u003eBuilt with corrosion-resistant materials, the 460771 is designed to withstand harsh pool environments while maintaining peak efficiency. Low NOx emissions meet air quality standards, making it an environmentally responsible choice without sacrificing performance.\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003csection class=\"text-token-text-primary w-full focus:outline-none [--shadow-height:45px] has-data-writing-block:pointer-events-none has-data-writing-block:-mt-(--shadow-height) has-data-writing-block:pt-(--shadow-height) [\u0026amp;:has([data-writing-block])\u0026gt;*]:pointer-events-auto [content-visibility:auto] supports-[content-visibility:auto]:[contain-intrinsic-size:auto_100lvh] R6Vx5W_threadScrollVars scroll-mb-[calc(var(--scroll-root-safe-area-inset-bottom,0px)+var(--thread-response-height))] scroll-mt-[calc(var(--header-height)+min(200px,max(70px,20svh)))]\" dir=\"auto\" data-turn-id=\"request-69ed3017-cb7c-83e8-99f3-dedd59fc1a7d-37\" data-testid=\"conversation-turn-214\" data-scroll-anchor=\"false\" data-turn=\"assistant\"\u003e\n\u003cdiv class=\"text-base my-auto mx-auto pb-10 [--thread-content-margin:var(--thread-content-margin-xs,calc(var(--spacing)*4))] @w-sm\/main:[--thread-content-margin:var(--thread-content-margin-sm,calc(var(--spacing)*6))] @w-lg\/main:[--thread-content-margin:var(--thread-content-margin-lg,calc(var(--spacing)*16))] px-(--thread-content-margin)\"\u003e\n\u003cdiv class=\"[--thread-content-max-width:40rem] @w-lg\/main:[--thread-content-max-width:48rem] mx-auto max-w-(--thread-content-max-width) flex-1 group\/turn-messages focus-visible:outline-hidden relative flex w-full min-w-0 flex-col agent-turn\"\u003e\n\u003cdiv class=\"flex max-w-full flex-col gap-4 grow\"\u003e\n\u003cdiv data-message-author-role=\"assistant\" data-message-id=\"ba8b1b73-a81e-4f94-b22f-7deba1daa14a\" dir=\"auto\" data-message-model-slug=\"gpt-5-5-thinking\" class=\"min-h-8 text-message relative flex w-full flex-col items-end gap-2 text-start break-words whitespace-normal outline-none keyboard-focused:focus-ring [.text-message+\u0026amp;]:mt-1\" data-turn-start-message=\"true\" tabindex=\"0\"\u003e\n\u003cdiv class=\"flex w-full flex-col gap-1 empty:hidden\"\u003e\n\u003cdiv class=\"markdown prose dark:prose-invert w-full wrap-break-word dark markdown-new-styling\"\u003e\n\u003cp data-start=\"0\" data-end=\"40\"\u003e────────────────────────────────────────\u003c\/p\u003e\n\u003ch2 data-section-id=\"w1c0q0\" data-start=\"42\" data-end=\"77\"\u003eFrequently Asked Questions (FAQ)\u003c\/h2\u003e\n\u003cp data-start=\"79\" data-end=\"292\"\u003e\u003cstrong data-start=\"79\" data-end=\"145\"\u003eQ: What is the Pentair 460771 MasterTemp ASME heater used for?\u003c\/strong\u003e\u003cbr data-start=\"145\" data-end=\"148\"\u003eA: The Pentair 460771 is a 250,000 BTU natural gas pool and spa heater designed for commercial and high-demand residential heating applications.\u003c\/p\u003e\n\u003chr data-start=\"294\" data-end=\"297\"\u003e\n\u003cp data-start=\"299\" data-end=\"469\"\u003e\u003cstrong data-start=\"299\" data-end=\"343\"\u003eQ: Is the Pentair 460771 ASME certified?\u003c\/strong\u003e\u003cbr data-start=\"343\" data-end=\"346\"\u003eA: Yes. This model is ASME certified, making it suitable for commercial-grade and code-required pool heating installations.\u003c\/p\u003e\n\u003chr data-start=\"471\" data-end=\"474\"\u003e\n\u003cp data-start=\"476\" data-end=\"642\"\u003e\u003cstrong data-start=\"476\" data-end=\"528\"\u003eQ: Is the Pentair 460771 natural gas or propane?\u003c\/strong\u003e\u003cbr data-start=\"528\" data-end=\"531\"\u003eA: This model is designed for natural gas. Propane versions are available under different Pentair part numbers.\u003c\/p\u003e\n\u003chr data-start=\"644\" data-end=\"647\"\u003e\n\u003cp data-start=\"649\" data-end=\"862\"\u003e\u003cstrong data-start=\"649\" data-end=\"702\"\u003eQ: What size pool is the Pentair 460771 best for?\u003c\/strong\u003e\u003cbr data-start=\"702\" data-end=\"705\"\u003eA: This 250K BTU heater is best for medium-sized pools, spas, and commercial systems that need dependable heating without requiring a larger 400K BTU heater.\u003c\/p\u003e\n\u003chr data-start=\"864\" data-end=\"867\"\u003e\n\u003cp data-start=\"869\" data-end=\"1076\"\u003e\u003cstrong data-start=\"869\" data-end=\"918\"\u003eQ: Is the Pentair 460771 MasterTemp worth it?\u003c\/strong\u003e\u003cbr data-start=\"918\" data-end=\"921\"\u003eA: Yes. It is a strong option for customers who need ASME-certified natural gas heating, low NOx performance, digital controls, and heavy-duty reliability.\u003c\/p\u003e\n\u003chr data-start=\"1078\" data-end=\"1081\"\u003e\n\u003cp data-start=\"1083\" data-end=\"1248\"\u003e\u003cstrong data-start=\"1083\" data-end=\"1135\"\u003eQ: What voltage does the Pentair 460771 require?\u003c\/strong\u003e\u003cbr data-start=\"1135\" data-end=\"1138\"\u003eA: This heater supports 120V or 240V operation, giving installers flexibility for different electrical setups.\u003c\/p\u003e\n\u003chr data-start=\"1250\" data-end=\"1253\"\u003e\n\u003cp data-start=\"1255\" data-end=\"1482\"\u003e\u003cstrong data-start=\"1255\" data-end=\"1320\"\u003eQ: Does the Pentair 460771 require professional installation?\u003c\/strong\u003e\u003cbr data-start=\"1320\" data-end=\"1323\"\u003eA: Yes. Professional installation is recommended due to natural gas sizing, electrical wiring, plumbing, venting, ASME requirements, and local code compliance.\u003c\/p\u003e\n\u003chr data-start=\"1484\" data-end=\"1487\"\u003e\n\u003cp data-start=\"1489\" data-end=\"1724\"\u003e\u003cstrong data-start=\"1489\" data-end=\"1551\"\u003eQ: Can the Pentair 460771 replace my existing pool heater?\u003c\/strong\u003e\u003cbr data-start=\"1551\" data-end=\"1554\"\u003eA: Yes. It can replace many existing natural gas pool heaters, but compatibility depends on gas supply, plumbing layout, electrical setup, venting, and code requirements.\u003c\/p\u003e\n\u003chr data-start=\"1726\" data-end=\"1729\"\u003e\n\u003cp data-start=\"1731\" data-end=\"1892\"\u003e\u003cstrong data-start=\"1731\" data-end=\"1778\"\u003eQ: Is the Pentair 460771 Low NOx compliant?\u003c\/strong\u003e\u003cbr data-start=\"1778\" data-end=\"1781\"\u003eA: Yes. This heater is designed with Low NOx emissions to meet strict air quality standards in regulated areas.\u003c\/p\u003e\n\u003chr data-start=\"1894\" data-end=\"1897\"\u003e\n\u003cp data-start=\"1899\" data-end=\"2120\" data-is-last-node=\"\" data-is-only-node=\"\"\u003e\u003cstrong data-start=\"1899\" data-end=\"1973\"\u003eQ: When should I choose the Pentair 460771 instead of a larger heater?\u003c\/strong\u003e\u003cbr data-start=\"1973\" data-end=\"1976\"\u003eA: Choose this 250K BTU model if you need ASME-certified heating for a medium pool or spa without the faster heat-up power of a 400K BTU heater.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"z-0 flex min-h-[46px] justify-start\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv class=\"mt-3 w-full empty:hidden\"\u003e\n\u003cdiv class=\"text-center\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003cdiv aria-hidden=\"true\" class=\"pointer-events-none -mt-px h-px translate-y-[calc(var(--scroll-root-safe-area-inset-bottom)-14*var(--spacing))]\"\u003e\u003cbr\u003e\u003c\/div\u003e","brand":"Pentair","offers":[{"title":"Default Title","offer_id":49181647634744,"sku":"460771","price":4451.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0808\/6319\/9544\/files\/460771.png?v=1777922241","url":"https:\/\/appaetechpoolsupply.com\/products\/pentair-460771-mastertemp-250k-asme-gas-heater","provider":"AppaeTech Pool Supply","version":"1.0","type":"link"}