{"product_id":"weil-mclain-cgi™-series-5-gas-boiler-381359364-cast-iron-induced-draft-84-afue","title":"Weil-McLain CGi Series 5 Gas Boiler 381359364 Cast Iron, Induced Draft, 84% AFUE","description":"\u003ch2 data-end=\"1001\" data-start=\"612\"\u003eWeil-McLain CGi Series 5 Gas Boiler 381359364 Cast Iron, Induced Draft, 84% AFUE\u003c\/h2\u003e\n\u003cp data-end=\"1001\" data-start=\"612\"\u003eThe \u003cstrong data-end=\"665\" data-start=\"616\"\u003eWeil-McLain CGi  Series 5 (Model 381-359-364)\u003c\/strong\u003e is a premium cast-iron, gas-fired hot-water boiler engineered for long-lasting comfort and efficiency. Designed for both residential and light commercial installations, this unit offers \u003cstrong data-end=\"881\" data-start=\"852\"\u003einduced-draft performance\u003c\/strong\u003e, an \u003cstrong data-end=\"916\" data-start=\"886\"\u003e84% AFUE efficiency rating\u003c\/strong\u003e, and a durable cast-iron heat exchanger that ensures reliable operation for decades.\u003c\/p\u003e\n\u003cp data-end=\"1394\" data-start=\"1003\"\u003eThis CGi model includes \u003cstrong data-end=\"1059\" data-start=\"1027\"\u003eUnity-CI text-based controls\u003c\/strong\u003e, a \u003cstrong data-end=\"1092\" data-start=\"1063\"\u003ebuilt-in low water cutoff\u003c\/strong\u003e, and a fully insulated jacket for improved thermal performance. With flexible venting, quiet operation, and proven reliability from Weil-McLain — North America’s most trusted boiler manufacturer — this system is an excellent choice for hydronic heating systems.\u003c\/p\u003e\n\u003ch5 data-end=\"1423\" data-start=\"1401\"\u003e\u003cstrong data-end=\"1423\" data-start=\"1404\"\u003eFeatures\u003c\/strong\u003e\u003c\/h5\u003e\n\u003cul data-end=\"2173\" data-start=\"1425\"\u003e\n\u003cli data-end=\"1526\" data-start=\"1425\"\u003e\n\u003cp data-end=\"1526\" data-start=\"1427\"\u003e\u003cstrong data-end=\"1450\" data-start=\"1427\"\u003e84% AFUE Efficiency\u003c\/strong\u003e for dependable heating performance.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1620\" data-start=\"1527\"\u003e\n\u003cp data-end=\"1620\" data-start=\"1529\"\u003e\u003cstrong data-end=\"1560\" data-start=\"1529\"\u003eUnity-CI electronic control\u003c\/strong\u003e with digital text display for simple setup \u0026amp; diagnostics.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1702\" data-start=\"1621\"\u003e\n\u003cp data-end=\"1702\" data-start=\"1623\"\u003e\u003cstrong data-end=\"1647\" data-start=\"1623\"\u003eInduced-draft design\u003c\/strong\u003e — improves venting reliability and system stability.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1763\" data-start=\"1703\"\u003e\n\u003cp data-end=\"1763\" data-start=\"1705\"\u003e\u003cstrong data-end=\"1743\" data-start=\"1705\"\u003eIntegrated low-water cutoff system\u003c\/strong\u003e for added safety.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1839\" data-start=\"1764\"\u003e\n\u003cp data-end=\"1839\" data-start=\"1766\"\u003e\u003cstrong data-end=\"1805\" data-start=\"1766\"\u003eHeavy-duty cast-iron heat exchanger\u003c\/strong\u003e designed for long service life.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1906\" data-start=\"1840\"\u003e\n\u003cp data-end=\"1906\" data-start=\"1842\"\u003e\u003cstrong data-end=\"1862\" data-start=\"1842\"\u003eFlexible venting\u003c\/strong\u003e: natural draft or direct exhaust options.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1983\" data-start=\"1907\"\u003e\n\u003cp data-end=\"1983\" data-start=\"1909\"\u003e\u003cstrong data-end=\"1953\" data-start=\"1909\"\u003eCompatible with ECO-HP heat pump systems\u003c\/strong\u003e (Weil-McLain hybrid-ready).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"2037\" data-start=\"1984\"\u003e\n\u003cp data-end=\"2037\" data-start=\"1986\"\u003e\u003cstrong data-end=\"2005\" data-start=\"1986\"\u003eQuiet operation\u003c\/strong\u003e with stainless-steel burners.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"2097\" data-start=\"2038\"\u003e\n\u003cp data-end=\"2097\" data-start=\"2040\"\u003e\u003cstrong data-end=\"2078\" data-start=\"2040\"\u003eTested for 50 PSI working pressure\u003c\/strong\u003e (CSA certified).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"2173\" data-start=\"2098\"\u003e\n\u003cp data-end=\"2173\" data-start=\"2100\"\u003e\u003cstrong data-end=\"2119\" data-start=\"2100\"\u003eMade in the USA\u003c\/strong\u003e heat exchanger.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"_tableContainer_1rjym_1\"\u003e\n\u003ch5 data-end=\"28\" data-start=\"0\"\u003eWhat Our Experts Think\u003c\/h5\u003e\n\u003cul data-end=\"727\" data-start=\"29\"\u003e\n\u003cli data-end=\"285\" data-start=\"29\"\u003e\n\u003cp data-end=\"285\" data-start=\"31\"\u003e\u003cstrong data-end=\"65\" data-start=\"31\"\u003eTrusted cast‑iron performance:\u003c\/strong\u003e The \u003cstrong data-end=\"127\" data-start=\"70\"\u003eWeil‑McLain CGi Series 5 Gas Boiler (Model 381359364)\u003c\/strong\u003e delivers \u003cstrong data-end=\"187\" data-start=\"137\"\u003edurable, corrosion‑resistant cast‑iron heating\u003c\/strong\u003e with stable, steady output — ideal for space‑heating in homes or small commercial applications.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"453\" data-start=\"286\"\u003e\n\u003cp data-end=\"453\" data-start=\"288\"\u003e\u003cstrong data-end=\"322\" data-start=\"288\"\u003eReliable induced draft design:\u003c\/strong\u003e The induced‑draft system improves combustion efficiency and airflow control, enhancing performance over older atmospheric units.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"593\" data-start=\"454\"\u003e\n\u003cp data-end=\"593\" data-start=\"456\"\u003e\u003cstrong data-end=\"480\" data-start=\"456\"\u003eEfficient operation:\u003c\/strong\u003e \u003cstrong data-end=\"493\" data-start=\"481\"\u003e84% AFUE\u003c\/strong\u003e provides respectable fuel savings and consistent warmth compared with older conventional boilers.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"727\" data-start=\"594\"\u003e\n\u003cp data-end=\"727\" data-start=\"596\"\u003e\u003cstrong data-end=\"617\" data-start=\"596\"\u003eService‑friendly:\u003c\/strong\u003e Well‑engineered with accessible components, making routine maintenance and technician tuning straightforward.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch5 data-end=\"746\" data-start=\"729\"\u003eProduct Q\u0026amp;A\u003c\/h5\u003e\n\u003cul data-end=\"1466\" data-start=\"747\"\u003e\n\u003cli data-end=\"908\" data-start=\"747\"\u003e\n\u003cp data-end=\"908\" data-start=\"749\"\u003e\u003cstrong data-end=\"781\" data-start=\"749\"\u003eWhat type of boiler is this?\u003c\/strong\u003e\u003cbr data-end=\"784\" data-start=\"781\"\u003eA \u003cstrong data-end=\"836\" data-start=\"788\"\u003ecast‑iron, natural gas‑fired hydronic boiler\u003c\/strong\u003e that generates hot water for baseboard, radiator, or radiant systems.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1115\" data-start=\"909\"\u003e\n\u003cp data-end=\"1115\" data-start=\"911\"\u003e\u003cstrong data-end=\"939\" data-start=\"911\"\u003eWhat does 84% AFUE mean?\u003c\/strong\u003e\u003cbr data-end=\"942\" data-start=\"939\"\u003eIt means \u003cstrong data-end=\"981\" data-start=\"953\"\u003e84% of the fuel’s energy\u003c\/strong\u003e is converted into usable heat — the rest is lost through exhaust. This efficiency is typical for traditional induced‑draft designs.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1278\" data-start=\"1116\"\u003e\n\u003cp data-end=\"1278\" data-start=\"1118\"\u003e\u003cstrong data-end=\"1146\" data-start=\"1118\"\u003eWhere is this best used?\u003c\/strong\u003e\u003cbr data-end=\"1149\" data-start=\"1146\"\u003eIdeal for \u003cstrong data-end=\"1222\" data-start=\"1161\"\u003esingle‑family homes, duplexes, or small commercial spaces\u003c\/strong\u003e where dependable, straightforward heating is desired.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1466\" data-start=\"1279\"\u003e\n\u003cp data-end=\"1466\" data-start=\"1281\"\u003e\u003cstrong data-end=\"1317\" data-start=\"1281\"\u003eDoes it require special venting?\u003c\/strong\u003e\u003cbr data-end=\"1320\" data-start=\"1317\"\u003eYes — induced‑draft boilers require \u003cstrong data-end=\"1417\" data-start=\"1358\"\u003eproper venting (typically mechanical\/vent fan and flue)\u003c\/strong\u003e per local codes and manufacturer specifications.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch5 data-end=\"1490\" data-start=\"1468\"\u003eMaintenance Tips\u003c\/h5\u003e\n\u003cul data-end=\"2304\" data-start=\"1491\"\u003e\n\u003cli data-end=\"1669\" data-start=\"1491\"\u003e\n\u003cp data-end=\"1669\" data-start=\"1493\"\u003e\u003cstrong data-end=\"1525\" data-start=\"1493\"\u003eAnnual professional service:\u003c\/strong\u003e Have a licensed HVAC technician inspect the burner, heat exchanger, combustion performance, and controls each year before the heating season.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1802\" data-start=\"1670\"\u003e\n\u003cp data-end=\"1802\" data-start=\"1672\"\u003e\u003cstrong data-end=\"1700\" data-start=\"1672\"\u003eMonitor system pressure:\u003c\/strong\u003e Keep boiler pressure within manufacturer‑recommended ranges and check expansion tank functionality.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1916\" data-start=\"1803\"\u003e\n\u003cp data-end=\"1916\" data-start=\"1805\"\u003e\u003cstrong data-end=\"1833\" data-start=\"1805\"\u003eBleed air from circuits:\u003c\/strong\u003e Release trapped air in radiators or baseboards to ensure even heat distribution.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"2037\" data-start=\"1917\"\u003e\n\u003cp data-end=\"2037\" data-start=\"1919\"\u003e\u003cstrong data-end=\"1948\" data-start=\"1919\"\u003eCheck venting and intake:\u003c\/strong\u003e Ensure vents, flue, and air intake remain clear of debris for safe combustion airflow.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"2157\" data-start=\"2038\"\u003e\n\u003cp data-end=\"2157\" data-start=\"2040\"\u003e\u003cstrong data-end=\"2062\" data-start=\"2040\"\u003eInspect for leaks:\u003c\/strong\u003e Periodically check valves, fittings, and pipe connections for signs of water or gas leakage.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"2304\" data-start=\"2158\"\u003e\n\u003cp data-end=\"2304\" data-start=\"2160\"\u003e\u003cstrong data-end=\"2183\" data-start=\"2160\"\u003eFlush periodically:\u003c\/strong\u003e Sediment and scale may accumulate over time — periodic flushing helps maintain efficiency and prolongs component life\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Weil-McLain","offers":[{"title":"Default Title","offer_id":54162688901404,"sku":"W381359364","price":4581.11,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0933\/0622\/4924\/files\/Weil-McLain-CGi-5-Series-4-119000-BTU-Cast-Iron-Natural-Gas-Boiler-Angled-View-2_26876a1c-8bd8-4fd3-80a2-17501c58c531_7.jpg?v=1780152196","url":"https:\/\/www.mybackyardzone.com\/products\/weil-mclain-cgi%e2%84%a2-series-5-gas-boiler-381359364-cast-iron-induced-draft-84-afue","provider":"Backup Power Made Simple","version":"1.0","type":"link"}