{"product_id":"grundfos-gnta-expansion-tank","title":"Grundfos GNTA ASME Diaphragm Expansion Tank - Hydronic","description":"\u003c!-- TABS --\u003e\n\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cdiv class=\"gs\"\u003e\n\u003cdiv class=\"gs-head\"\u003e\n\u003cdiv class=\"gs-eyebrow\"\u003eGrundfos · ASME Hydronic Expansion Tank\u003c\/div\u003e\n\u003cdiv class=\"gs-title\"\u003eGNTA Diaphragm Expansion Tank\u003c\/div\u003e\n\u003cdiv class=\"gs-sub\"\u003e12 sizes from 7.8 to 158 gallons for closed heating and cooling loops.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"gs-badges\"\u003e\n\u003cdiv class=\"gs-badge\" style=\"background:#B3122A;color:#FFFFFF;border-color:#B3122A\"\u003e150 PSI (GNTA-15 to 60), 125 PSI Larger\u003c\/div\u003e\n\u003cdiv class=\"gs-badge\"\u003eASME Section VIII Div. 1\u003c\/div\u003e\n\u003cdiv class=\"gs-badge\"\u003eFixed Heavy-Duty Butyl Diaphragm\u003c\/div\u003e\n\u003cdiv class=\"gs-badge\"\u003ePartial Acceptance\u003c\/div\u003e\n\u003cdiv class=\"gs-badge\"\u003e7.8-158 Gallons\u003c\/div\u003e\n\u003cdiv class=\"gs-badge\"\u003eUp to 240°F\u003c\/div\u003e\n\u003cdiv class=\"gs-badge\"\u003eClosed Hydronic Heating and Cooling\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"gs-sec\"\u003e\n\u003cdiv class=\"gs-h\"\u003eOverview\u003c\/div\u003e\n\u003cdiv class=\"gs-lead\"\u003e\n\u003cp\u003eGrundfos GNTA tanks are ASME diaphragm expansion tanks for closed hydronic heating and chilled water systems. As the system heats up, the water expands into the tank against an air cushion held behind a heavy-duty butyl diaphragm, keeping system pressure steady and below the relief valve setting. The diaphragm is fixed (not replaceable) and the tank is partial acceptance: the acceptance volume in the table is the most system water the tank can take.\u003c\/p\u003e\n\u003cp\u003eThe tank is factory pre-charged and field adjustable; set the pre-charge to the system fill pressure at the tank before filling.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background:#FFFFFF;border:1px solid #C7CBD1;border-top:3px solid #B3122A;padding:12px 16px 12px;margin:16px 0 4px;font-size:13.5px;line-height:1.55;color:#4A4A4F\"\u003e\n\u003cdiv style=\"font-family:Arial Black,Arial,sans-serif;font-size:11px;letter-spacing:1.2px;text-transform:uppercase;color:#B3122A;margin-bottom:8px\"\u003eWhat Ships and What It Needs to Run\u003c\/div\u003e\n\u003cp style=\"margin:0 0 6px\"\u003e\u003cstrong style=\"color:#B3122A\"\u003eIncluded:\u003c\/strong\u003e the GNTA tank with factory-installed diaphragm and charging valve.\u003c\/p\u003e\n\u003cp style=\"margin:0 0 6px\"\u003e\u003cstrong style=\"color:#B3122A\"\u003eShips:\u003c\/strong\u003e about 42-591 lb by model, by LTL freight to a commercial dock; liftgate or residential delivery is a paid checkout option. Larger tanks ship on their own skid or base ring.\u003c\/p\u003e\n\u003cp style=\"margin:0\"\u003e\u003cstrong style=\"color:#B3122A\"\u003eNeeded to install:\u003c\/strong\u003e isolation valve and drain at the system connection, a pressure gauge or tire gauge to set the pre-charge, and a level floor or pad rated for the full-of-water weight.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background:#E1E3E6;border-left:3px solid #B8BDC4;padding:8px 14px;font-size:11.5px;color:#4A4A4F;margin-top:14px;line-height:1.5\"\u003eGenuine Grundfos equipment, factory-new in original packaging — sold and supported by Watermain Supply, an independent industrial supplier.\u003c\/div\u003e\n\u003cdiv class=\"gs-sec\"\u003e\n\u003cdiv class=\"gs-h\"\u003eSpecifications\u003c\/div\u003e\n\u003cdiv class=\"gs-lead\"\u003e\n\u003cdiv class=\"table-wrapper\"\u003e\u003ctable class=\"gs-tbl\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eTank type\u003c\/td\u003e\n\u003ctd\u003eFixed diaphragm, partial acceptance\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCode\u003c\/td\u003e\n\u003ctd\u003eASME Section VIII Division 1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax working pressure\u003c\/td\u003e\n\u003ctd\u003e150 PSI (GNTA-15 to GNTA-60), 125 PSI (all larger)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax temperature\u003c\/td\u003e\n\u003ctd\u003e240°F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePre-charge\u003c\/td\u003e\n\u003ctd\u003eFactory set, field adjustable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"gs-sec\"\u003e\n\u003cdiv class=\"gs-h\"\u003eModels, Part Numbers and Weights\u003c\/div\u003e\n\u003cdiv class=\"gs-lead\"\u003e\n\u003cdiv class=\"table-wrapper\"\u003e\u003ctable class=\"gs-tbl\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003ePart no.\u003c\/th\u003e\n\u003cth\u003eGallons\u003c\/th\u003e\n\u003cth\u003eAcceptance (gal)\u003c\/th\u003e\n\u003cth\u003eDia. x height (in)\u003c\/th\u003e\n\u003cth\u003eSystem conn.\u003c\/th\u003e\n\u003cth\u003eMax pressure\u003c\/th\u003e\n\u003cth\u003eWeight (lb)\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eGNTA-15\u003c\/td\u003e\n\u003ctd\u003e99426692\u003c\/td\u003e\n\u003ctd\u003e7.8\u003c\/td\u003e\n\u003ctd\u003e6.3\u003c\/td\u003e\n\u003ctd\u003e12 x 19\u003c\/td\u003e\n\u003ctd\u003e3\/4 in\u003c\/td\u003e\n\u003ctd\u003e150 PSI\u003c\/td\u003e\n\u003ctd\u003e42\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGNTA-20\u003c\/td\u003e\n\u003ctd\u003e99426697\u003c\/td\u003e\n\u003ctd\u003e11\u003c\/td\u003e\n\u003ctd\u003e8.8\u003c\/td\u003e\n\u003ctd\u003e12 x 25\u003c\/td\u003e\n\u003ctd\u003e3\/4 in\u003c\/td\u003e\n\u003ctd\u003e150 PSI\u003c\/td\u003e\n\u003ctd\u003e52\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGNTA-40\u003c\/td\u003e\n\u003ctd\u003e99426701\u003c\/td\u003e\n\u003ctd\u003e25\u003c\/td\u003e\n\u003ctd\u003e20\u003c\/td\u003e\n\u003ctd\u003e16 x 33\u003c\/td\u003e\n\u003ctd\u003e1 in\u003c\/td\u003e\n\u003ctd\u003e150 PSI\u003c\/td\u003e\n\u003ctd\u003e84\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGNTA-60\u003c\/td\u003e\n\u003ctd\u003e99426709\u003c\/td\u003e\n\u003ctd\u003e35\u003c\/td\u003e\n\u003ctd\u003e28\u003c\/td\u003e\n\u003ctd\u003e16 x 44\u003c\/td\u003e\n\u003ctd\u003e1 in\u003c\/td\u003e\n\u003ctd\u003e150 PSI\u003c\/td\u003e\n\u003ctd\u003e97\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGNTA-80\u003c\/td\u003e\n\u003ctd\u003e99426725\u003c\/td\u003e\n\u003ctd\u003e45\u003c\/td\u003e\n\u003ctd\u003e36\u003c\/td\u003e\n\u003ctd\u003e20 x 38\u003c\/td\u003e\n\u003ctd\u003e1 in\u003c\/td\u003e\n\u003ctd\u003e125 PSI\u003c\/td\u003e\n\u003ctd\u003e148\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGNTA-100\u003c\/td\u003e\n\u003ctd\u003e99426727\u003c\/td\u003e\n\u003ctd\u003e60\u003c\/td\u003e\n\u003ctd\u003e48\u003c\/td\u003e\n\u003ctd\u003e20 x 49\u003c\/td\u003e\n\u003ctd\u003e1 in\u003c\/td\u003e\n\u003ctd\u003e125 PSI\u003c\/td\u003e\n\u003ctd\u003e175\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGNTA-120\u003c\/td\u003e\n\u003ctd\u003e99426704\u003c\/td\u003e\n\u003ctd\u003e70\u003c\/td\u003e\n\u003ctd\u003e56\u003c\/td\u003e\n\u003ctd\u003e24 x 46\u003c\/td\u003e\n\u003ctd\u003e1-1\/2 in\u003c\/td\u003e\n\u003ctd\u003e125 PSI\u003c\/td\u003e\n\u003ctd\u003e259\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGNTA-144\u003c\/td\u003e\n\u003ctd\u003e99426707\u003c\/td\u003e\n\u003ctd\u003e80\u003c\/td\u003e\n\u003ctd\u003e65\u003c\/td\u003e\n\u003ctd\u003e24 x 49\u003c\/td\u003e\n\u003ctd\u003e1-1\/2 in\u003c\/td\u003e\n\u003ctd\u003e125 PSI\u003c\/td\u003e\n\u003ctd\u003e268\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGNTA-180\u003c\/td\u003e\n\u003ctd\u003e99426772\u003c\/td\u003e\n\u003ctd\u003e90\u003c\/td\u003e\n\u003ctd\u003e73\u003c\/td\u003e\n\u003ctd\u003e24 x 52\u003c\/td\u003e\n\u003ctd\u003e1-1\/2 in\u003c\/td\u003e\n\u003ctd\u003e125 PSI\u003c\/td\u003e\n\u003ctd\u003e283\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGNTA-200\u003c\/td\u003e\n\u003ctd\u003e99426784\u003c\/td\u003e\n\u003ctd\u003e115\u003c\/td\u003e\n\u003ctd\u003e93\u003c\/td\u003e\n\u003ctd\u003e24 x 66\u003c\/td\u003e\n\u003ctd\u003e1-1\/2 in\u003c\/td\u003e\n\u003ctd\u003e125 PSI\u003c\/td\u003e\n\u003ctd\u003e325\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGNTA-240\u003c\/td\u003e\n\u003ctd\u003e99426788\u003c\/td\u003e\n\u003ctd\u003e140\u003c\/td\u003e\n\u003ctd\u003e114\u003c\/td\u003e\n\u003ctd\u003e24 x 78\u003c\/td\u003e\n\u003ctd\u003e1-1\/2 in\u003c\/td\u003e\n\u003ctd\u003e125 PSI\u003c\/td\u003e\n\u003ctd\u003e362\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGNTA-260\u003c\/td\u003e\n\u003ctd\u003e99426790\u003c\/td\u003e\n\u003ctd\u003e158\u003c\/td\u003e\n\u003ctd\u003e128\u003c\/td\u003e\n\u003ctd\u003e30 x 63\u003c\/td\u003e\n\u003ctd\u003e1-1\/2 in\u003c\/td\u003e\n\u003ctd\u003e125 PSI\u003c\/td\u003e\n\u003ctd\u003e591\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\u003cp style=\"font-size:12.5px;color:#9B9EA3;margin-top:6px;line-height:1.55\"\u003eWeights are Grundfos’s published figures (approximate shipping weight). Dimensions in inches. Tanks over 150 lb ship by LTL freight.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"gs-sec\"\u003e\n\u003cdiv class=\"gs-h\"\u003eBefore You Buy — The Limits That Decide the Fit\u003c\/div\u003e\n\u003cdiv class=\"gs-lead\"\u003e\n\u003cdiv class=\"table-wrapper\"\u003e\u003ctable class=\"gs-tbl\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eService\u003c\/td\u003e\n\u003ctd\u003eClosed hydronic systems only. Not for potable water: use GTXA for domestic hot water.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSizing\u003c\/td\u003e\n\u003ctd\u003eChoose by acceptance volume, not tank volume. Acceptance must cover the system’s expansion from fill to maximum operating temperature.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLiquid\u003c\/td\u003e\n\u003ctd\u003eWater or water-glycol.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePressure\u003c\/td\u003e\n\u003ctd\u003eRelief valve at or below the tank rating.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"gs-sec\"\u003e\n\u003cdiv class=\"gs-h\"\u003eApplications\u003c\/div\u003e\n\u003cdiv class=\"gs-lead\"\u003e\n\u003cp\u003eBoiler and chilled water loops, radiant heating, heat pump and process cooling loops in commercial and institutional buildings.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"gs-sec\"\u003e\n\u003cdiv class=\"gs-h\"\u003eMaterials of Construction\u003c\/div\u003e\n\u003cdiv class=\"gs-lead\"\u003e\n\u003cdiv class=\"table-wrapper\"\u003e\u003ctable class=\"gs-tbl\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eShell\u003c\/td\u003e\n\u003ctd\u003eSteel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiaphragm\u003c\/td\u003e\n\u003ctd\u003eHeavy-duty butyl, fixed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExterior\u003c\/td\u003e\n\u003ctd\u003ePrimer, black painted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"gs-contact\"\u003eFor engineering-led sizing and selection support or a factory submittal, email \u003ca href=\"mailto:sales@watermainsupply.com\"\u003esales@watermainsupply.com\u003c\/a\u003e or call \u003ca href=\"tel:18885104036\"\u003e1-888.510.4036\u003c\/a\u003e.\u003cbr\u003e© Watermain Supply — A division of E4 Industrial LLC\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch5\u003eVideos\u003c\/h5\u003e\n\u003cdiv class=\"gs\"\u003e\u003cdiv class=\"gs-sec\" style=\"margin-top:6px\"\u003e\n\u003cp style=\"font-size:13px;color:#9B9EA3\"\u003eProduct videos are being added to this listing. For a walkthrough in the meantime, email sales@watermainsupply.com.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003c!-- \/TABS --\u003e","brand":"Grundfos","offers":[{"title":"150 PSI \/ 7.8 Gal \/ GNTA-15","offer_id":50682240467119,"sku":"99426692","price":803.72,"currency_code":"USD","in_stock":true},{"title":"150 PSI \/ 11 Gal \/ GNTA-20","offer_id":50682240499887,"sku":"99426697","price":859.65,"currency_code":"USD","in_stock":true},{"title":"150 PSI \/ 25 Gal \/ GNTA-40","offer_id":50682240532655,"sku":"99426701","price":1333.19,"currency_code":"USD","in_stock":true},{"title":"150 PSI \/ 35 Gal \/ GNTA-60","offer_id":50682240565423,"sku":"99426709","price":1372.49,"currency_code":"USD","in_stock":true},{"title":"125 PSI \/ 45 Gal \/ GNTA-80","offer_id":50682240598191,"sku":"99426725","price":1917.89,"currency_code":"USD","in_stock":true},{"title":"125 PSI \/ 60 Gal \/ GNTA-100","offer_id":50682240630959,"sku":"99426727","price":2056.98,"currency_code":"USD","in_stock":true},{"title":"125 PSI \/ 70 Gal \/ GNTA-120","offer_id":50682240663727,"sku":"99426704","price":2420.77,"currency_code":"USD","in_stock":true},{"title":"125 PSI \/ 80 Gal \/ GNTA-144","offer_id":50682240696495,"sku":"99426707","price":2567.86,"currency_code":"USD","in_stock":true},{"title":"125 PSI \/ 90 Gal \/ GNTA-180","offer_id":50682240729263,"sku":"99426772","price":2886.74,"currency_code":"USD","in_stock":true},{"title":"125 PSI \/ 115 Gal \/ GNTA-200","offer_id":50682240762031,"sku":"99426784","price":2856.42,"currency_code":"USD","in_stock":true},{"title":"125 PSI \/ 140 Gal \/ GNTA-240","offer_id":50682240794799,"sku":"99426788","price":3546.95,"currency_code":"USD","in_stock":true},{"title":"125 PSI \/ 158 Gal \/ GNTA-260","offer_id":50682240827567,"sku":"99426790","price":4042.11,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0264\/1913\/4527\/files\/Grundfos_GNTA-40_to_280_500x500_0f285a89-8f9a-40be-be18-8fbbec114ffb.png?v=1792178350","url":"https:\/\/watermainsupply.com\/products\/grundfos-gnta-expansion-tank","provider":"Watermainsupply","version":"1.0","type":"link"}