{"product_id":"zurn-xt-18","title":"Zurn XT-18 Lead-Free Thermal Expansion Tank, Carbon Steel, NPT","description":"\u003cp\u003eThe Zurn Wilkins XT-18 is a potable water-heater thermal expansion tank with a 4.8 gallon total volume, factory pre-charged to 40 psi. It is not suitable for fire sprinkler systems (per NFPA 13\/13D). It features a carbon steel body. Rated to 80 psi and up to 200°F. This model is certified lead-free for potable-water installations.\u003c\/p\u003e\u003cp\u003eThe XT Thermal Expansion Tank is utilized on potable water lines between the backflow preventer or pressure reducing valve and the water heater for protection against water thermal expansion in residential applications. As the system pressure increases, water enters the polypropylene-lined water chamber of the tank, expanding a diaphragm into a pre-charged air chamber to keep the system pressure below the relief valve setting. Materials include a carbon steel shell with an epoxy finished coating, and corrosion-resistant stainless steel connection with a polypropylene liner and Butyl rubber diaphragm.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFeatures\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003ePre-charge is field adjustable for convenient maintenance\u003c\/li\u003e\n\u003cli\u003eCarbon steel shell with polypropylene liner ensures long-lasting construction\u003c\/li\u003e\n\u003cli\u003eDiaphragm style tank is ideal for thermal expansion protection in residential applications\u003c\/li\u003e\n\u003cli\u003eStainless steel connection resists corrosion\u003c\/li\u003e\n\u003cli\u003eLow-lead law compliant\u003c\/li\u003e\n\u003cli\u003eIAPMO® Listed\u003c\/li\u003e\n\u003cli\u003eWater Quality Association - Certified to NSF\/ANSI 61 \u0026amp; 372\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCommon Questions\u003c\/strong\u003e\u003c\/p\u003e\u003cdl\u003e\n\u003cdt\u003e\u003cstrong\u003eIs this rated for potable water?\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003eYes. It is IAPMO Listed, certified to NSF\/ANSI\/CAN 61 and NSF\/ANSI 372, and sits between the backflow preventer or pressure-reducing valve and the water heater on the potable cold-water supply.\u003c\/dd\u003e\n\u003cdt\u003e\u003cstrong\u003eCan I use this on a fire sprinkler system?\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003eNo. Zurn’s own sheet states this tank is not suitable for fire sprinkler systems as required by NFPA 13 or 13D.\u003c\/dd\u003e\n\u003cdt\u003e\u003cstrong\u003eWhat size do I need?\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003eThis model holds 4.8 gallons total, of which 2.4 gallons is usable acceptance volume (the expanded water the diaphragm can take before the pre-charge is overcome) -- size off the acceptance volume against your water heater’s expansion, not the total shell.\u003c\/dd\u003e\n\u003cdt\u003e\u003cstrong\u003eDo I need to adjust the pre-charge?\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003eMatch the factory 40 psi pre-charge to your incoming supply pressure before putting the tank in service (adjust with no water pressure in the tank), and confirm a relief valve set at a maximum of 150 psi is installed in the system.\u003c\/dd\u003e\n\u003c\/dl\u003e\u003cp\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Thermal Expansion Tank\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnection:\u003c\/strong\u003e NPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBody Material:\u003c\/strong\u003e Carbon Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMax Pressure (psi):\u003c\/strong\u003e 80\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMPN:\u003c\/strong\u003e XT-18\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature:\u003c\/strong\u003e up to 200°F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCertifications:\u003c\/strong\u003e NSF-61, NSF-372\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLead-Free:\u003c\/strong\u003e Yes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComponent:\u003c\/strong\u003e Expansion Tank\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTank Volume (gal):\u003c\/strong\u003e 4.8\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAcceptance Volume (gal):\u003c\/strong\u003e 2.4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePotable Water Rated:\u003c\/strong\u003e Yes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePre-Charge Pressure (psi):\u003c\/strong\u003e 40\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Zurn","offers":[{"title":"Default Title","offer_id":55656356544811,"sku":"XT-18","price":209.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0277\/3168\/9577\/files\/XT-8_ExpansionTank_AF_b2a06484-098d-4bec-a7a3-27ebca1acbf2.jpg?v=1790044243","url":"https:\/\/citysupplygroup.com\/products\/zurn-xt-18","provider":"City Supply","version":"1.0","type":"link"}