{"product_id":"zilmet-zht8-15-cal-pro-2-1-gallon-in-line-hydronic-expansion-tank-1-2-mnpt","title":"Zilmet ZHT8-15 Cal Pro 2.1 Gallon In-Line Hydronic Expansion Tank, 1\/2\" MNPT","description":"\u003ch1\u003eZilmet ZHT8-15 Cal Pro 2.1 Gallon In-Line Hydronic Expansion Tank, 1\/2\" MNPT\u003c\/h1\u003e\n\u003cp\u003eZilmet in-line hydronic expansion tanks feature a compact design and a seamless diaphragm that never stretches or creases. Each tank is leak tested and all diaphragms are designed to maximize draw-down. All tanks for use with a boiler in a non-potable, hydronic application.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFeatures\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eEach tank is factory leak tested to ensure tank integrity\u003c\/li\u003e\n\u003cli\u003eCertified synthetic SBR rubber diaphragm\u003c\/li\u003e\n\u003cli\u003eAll diaphragms designed to maximize drawdown\u003c\/li\u003e\n\u003cli\u003eMIG welding eliminates interior rough spots and sharp edges\u003c\/li\u003e\n\u003cli\u003eWelded side outlet allows easy and quick installation\u003c\/li\u003e\n\u003cli\u003eLow profile tank design with full membrane depth eliminates stretching of diaphragm, providing increased life cycle\u003c\/li\u003e\n\u003cli\u003eExternal baked on epoxy-polyester coating provides a durable, appliance like finish\u003c\/li\u003e\n\u003cli\u003eProtected pre charge valve eliminates potential leak path\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCarbon Steel Shell\u003c\/li\u003e\n\u003cli\u003eCarbon Steel Connection\u003c\/li\u003e\n\u003cli\u003eSBR synthetic rubber membrane\u003c\/li\u003e\n\u003cli\u003eMax Operating pressure 2-13.2 gal: 60 psi\u003c\/li\u003e\n\u003cli\u003eMax Operating Pressure 21-184 gal: 90psi\u003c\/li\u003e\n\u003cli\u003eOperating temperature: 210°F\u003c\/li\u003e\n\u003cli\u003eFactory precharge: 12 psi\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eFOR HYDRONIC USE ONLY\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eCapacity:  2.1 gallons\u003c\/li\u003e\n\u003cli\u003eDiameter:  8.7\"\u003c\/li\u003e\n\u003cli\u003eHeight:  11.6\"\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003e\u003cbr\u003e\u003c\/h4\u003e\n\u003ch4\u003e\n\u003ca href=\"https:\/\/zilmetusa.com\/wp-content\/uploads\/2025\/10\/Cal-Pro.pdf\"\u003eBrochure\u003c\/a\u003e\u003ca href=\"https:\/\/zilmetusa.com\/wp-content\/uploads\/2025\/10\/Stainless-Steel-Tank.pdf\"\u003e\u003c\/a\u003e\n\u003c\/h4\u003e\n\u003ch4\u003e\u003ca href=\"https:\/\/zilmetusa.com\/wp-content\/uploads\/2025\/11\/Expansion-Tanks-Installation-Manual.pdf\"\u003e\u003cspan\u003eInstallation Instructions\u003c\/span\u003e\u003c\/a\u003e\u003c\/h4\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/zilmetusa.com\/wp-content\/uploads\/2025\/10\/In-Line-Hydronic-Expansion-Tanks-Data-Submittal.pdf\"\u003e\u003cstrong\u003eSubmittal\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"Edmondson Supply","offers":[{"title":"Default Title","offer_id":52152028135640,"sku":"ZHT8-15","price":49.83,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0011\/6709\/7956\/files\/Screenshot2026-08-05210157.png?v=1785978149","url":"https:\/\/edmondsonsupply.com\/products\/zilmet-zht8-15-cal-pro-2-1-gallon-in-line-hydronic-expansion-tank-1-2-mnpt","provider":"Edmondson Supply","version":"1.0","type":"link"}