{"product_id":"weil-mclain-ultra-series-4-399000-btu-condensing-gas-boiler","title":"Weil-McLain Ultra Series 4 399,000 BTU Condensing Gas Boiler","description":"\u003ch2\u003eWeil-McLain Ultra Series 4 399,000 BTU Condensing Gas Boiler\u003c\/h2\u003e\n\u003cp\u003eWeil-McLain is a leading North American Brand of hydronic comfort heating systems for residential, commercial and institutional buildings, since 1881. Contractors, engineers, architects, homeowners, and facility managers alike rely on Weil-McLain boilers for their comfort heating needs. Installed in homes, offices, schools, restaurants, hotels, and other facilities throughout North America, the Weil-McLain brand is among the most trusted and often used in the building industry.\u003c\/p\u003e\n\u003ch5\u003eFeatures\u003c\/h5\u003e\n\u003cul\u003e\n\u003cli\u003eCast aluminum coated heat exchanger\u003c\/li\u003e\n\u003cli\u003eDesigned to operate in low temperature condensing applications\u003c\/li\u003e\n\u003cli\u003eOutdoor reset and domestic hot water priority\u003c\/li\u003e\n\u003cli\u003eModulates with 5:1 turn-down ratio\u003c\/li\u003e\n\u003cli\u003eHigh grade stainless steel burner features quiet operation\u003c\/li\u003e\n\u003cli\u003eU-Control gives the power for easy set-up and maintenance\u003c\/li\u003e\n\u003cli\u003eMultiple set-up and zone options\u003c\/li\u003e\n\u003cli\u003eSystem sensing recognizes system and outdoor temperatures\u003c\/li\u003e\n\u003cli\u003eTemperature management for up to three different set-points\u003c\/li\u003e\n\u003cli\u003eControl multiple boilers from a single control panel\u003c\/li\u003e\n\u003cli\u003eStandard screen messages provide service alerts and maintenance reminders\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch5 data-start=\"0\" data-end=\"30\"\u003eWhat Our Experts Think\u003c\/h5\u003e\n\u003cul data-start=\"31\" data-end=\"745\"\u003e\n\u003cli data-start=\"31\" data-end=\"262\"\u003e\n\u003cp data-start=\"33\" data-end=\"262\"\u003e\u003cstrong data-start=\"33\" data-end=\"57\"\u003eTop‑tier efficiency:\u003c\/strong\u003e The \u003cstrong data-start=\"62\" data-end=\"126\"\u003eWeil‑McLain Ultra Series 4 399,000 BTU Condensing Gas Boiler\u003c\/strong\u003e delivers \u003cstrong data-start=\"136\" data-end=\"179\"\u003eindustry‑leading condensing performance\u003c\/strong\u003e (typically up to ~95% AFUE), maximizing heat output while minimizing fuel costs.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"263\" data-end=\"440\"\u003e\n\u003cp data-start=\"265\" data-end=\"440\"\u003e\u003cstrong data-start=\"265\" data-end=\"291\"\u003eHigh heating capacity:\u003c\/strong\u003e With \u003cstrong data-start=\"297\" data-end=\"314\"\u003e399,000 BTU\/h\u003c\/strong\u003e, this model powers \u003cstrong data-start=\"334\" data-end=\"401\"\u003elarge homes, multifamily buildings, and light commercial spaces\u003c\/strong\u003e requiring substantial hydronic heat.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"441\" data-end=\"588\"\u003e\n\u003cp data-start=\"443\" data-end=\"588\"\u003e\u003cstrong data-start=\"443\" data-end=\"471\"\u003eSmooth, quiet operation:\u003c\/strong\u003e Advanced burner and heat‑transfer design provide stable combustion with reduced noise and more even heat delivery.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"589\" data-end=\"745\"\u003e\n\u003cp data-start=\"591\" data-end=\"745\"\u003e\u003cstrong data-start=\"591\" data-end=\"622\"\u003eDurable \u0026amp; service‑friendly:\u003c\/strong\u003e Corrosion‑resistant heat exchanger and accessible service points support long life and easier maintenance for technicians.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch5 data-start=\"747\" data-end=\"766\"\u003eProduct Q\u0026amp;A\u003c\/h5\u003e\n\u003cul data-start=\"767\" data-end=\"1597\"\u003e\n\u003cli data-start=\"767\" data-end=\"937\"\u003e\n\u003cp data-start=\"769\" data-end=\"937\"\u003e\u003cstrong data-start=\"769\" data-end=\"801\"\u003eWhat type of boiler is this?\u003c\/strong\u003e\u003cbr data-start=\"801\" data-end=\"804\"\u003eA \u003cstrong data-start=\"808\" data-end=\"849\"\u003ehigh‑efficiency condensing gas boiler\u003c\/strong\u003e that uses a secondary heat exchanger to extract extra energy from combustion exhaust.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"938\" data-end=\"1118\"\u003e\n\u003cp data-start=\"940\" data-end=\"1118\"\u003e\u003cstrong data-start=\"940\" data-end=\"966\"\u003eWhere is it best used?\u003c\/strong\u003e\u003cbr data-start=\"966\" data-end=\"969\"\u003eIdeal for \u003cstrong data-start=\"981\" data-end=\"1083\"\u003elarge residential properties, multifamily units, schools, offices, and light commercial facilities\u003c\/strong\u003e with significant heating demand.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1119\" data-end=\"1277\"\u003e\n\u003cp data-start=\"1121\" data-end=\"1277\"\u003e\u003cstrong data-start=\"1121\" data-end=\"1162\"\u003eWhat heating systems does it support?\u003c\/strong\u003e\u003cbr data-start=\"1162\" data-end=\"1165\"\u003eWorks with \u003cstrong data-start=\"1178\" data-end=\"1274\"\u003ehydronic baseboard, radiant floor systems, fan coils, and other hot‑water distribution loops\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1278\" data-end=\"1417\"\u003e\n\u003cp data-start=\"1280\" data-end=\"1417\"\u003e\u003cstrong data-start=\"1280\" data-end=\"1306\"\u003eWhat fuel does it use?\u003c\/strong\u003e\u003cbr data-start=\"1306\" data-end=\"1309\"\u003eNatural gas (propane conversion kits may be available from Weil‑McLain via a qualified HVAC technician).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1418\" data-end=\"1597\"\u003e\n\u003cp data-start=\"1420\" data-end=\"1597\"\u003e\u003cstrong data-start=\"1420\" data-end=\"1453\"\u003eDoes it need special venting?\u003c\/strong\u003e\u003cbr data-start=\"1453\" data-end=\"1456\"\u003eYes — condensing boilers typically use \u003cstrong data-start=\"1497\" data-end=\"1534\"\u003ePVC\/CPVC or polypropylene venting\u003c\/strong\u003e because of lower exhaust temperatures and condensate handling.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch5 data-start=\"1599\" data-end=\"1623\"\u003eMaintenance Tips\u003c\/h5\u003e\n\u003cul data-start=\"1624\" data-end=\"2460\"\u003e\n\u003cli data-start=\"1624\" data-end=\"1824\"\u003e\n\u003cp data-start=\"1626\" data-end=\"1824\"\u003e\u003cstrong data-start=\"1626\" data-end=\"1658\"\u003eAnnual professional service:\u003c\/strong\u003e Have a licensed HVAC technician inspect and tune the boiler before each heating season — checking the burner, heat exchanger, controls, and combustion performance.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1825\" data-end=\"1969\"\u003e\n\u003cp data-start=\"1827\" data-end=\"1969\"\u003e\u003cstrong data-start=\"1827\" data-end=\"1857\"\u003eCheck condensate drainage:\u003c\/strong\u003e Make sure condensate outlets and trap lines are clear and properly pitched to avoid buildup or freeze issues.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1970\" data-end=\"2079\"\u003e\n\u003cp data-start=\"1972\" data-end=\"2079\"\u003e\u003cstrong data-start=\"1972\" data-end=\"2000\"\u003eMonitor system pressure:\u003c\/strong\u003e Maintain proper boiler pressure and expansion tank condition as recommended.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2080\" data-end=\"2195\"\u003e\n\u003cp data-start=\"2082\" data-end=\"2195\"\u003e\u003cstrong data-start=\"2082\" data-end=\"2122\"\u003eClean intake \u0026amp; exhaust terminations:\u003c\/strong\u003e Keep vents free of debris and obstruction for safe combustion airflow.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2196\" data-end=\"2310\"\u003e\n\u003cp data-start=\"2198\" data-end=\"2310\"\u003e\u003cstrong data-start=\"2198\" data-end=\"2220\"\u003eInspect for leaks:\u003c\/strong\u003e Check around valves, fittings, and piping periodically for signs of water or gas leaks.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2311\" data-end=\"2460\"\u003e\n\u003cp data-start=\"2313\" data-end=\"2460\"\u003e\u003cstrong data-start=\"2313\" data-end=\"2340\"\u003eMaintain water quality:\u003c\/strong\u003e Use recommended corrosion inhibitors and schedule periodic system flushing to reduce scale and extend component life.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Weil-McLain","offers":[{"title":"Default Title","offer_id":54162689163548,"sku":"W383500738","price":8504.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0933\/0622\/4924\/files\/Weil-McLain-Ultra-Series-4-399000-BTU-Condensing-Gas-Boiler-Main-Image_22.jpg?v=1780152212","url":"https:\/\/www.mybackyardzone.com\/products\/weil-mclain-ultra-series-4-399000-btu-condensing-gas-boiler","provider":"Backup Power Made Simple","version":"1.0","type":"link"}