{"product_id":"watts-0066606etx-30-pressurized-expansion-tank","title":"Watts 0066606ETX-30 Pressurized Expansion Tank","description":"\u003ch3 data-section-id=\"17lc1ru\" data-start=\"0\" data-end=\"16\"\u003eDescription:\u003c\/h3\u003e\n\u003cp data-start=\"17\" data-end=\"743\"\u003eThe Watts 0066606 ETX-30 Pressurized Expansion Tank is a diaphragm-type expansion tank designed to control the thermal expansion of water in closed-loop hydronic heating systems and maintain system pressure below the relief valve setting. Commonly installed in residential and commercial hydronic heating systems, boiler plants, radiant heating systems, HVAC equipment, hot water circulation systems, and mechanical room installations requiring thermal expansion control. Maintenance technicians, HVAC contractors, facility engineers, and system integrators use this expansion tank for system upgrades, replacement projects, preventive maintenance, and new hydronic heating installations. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 data-section-id=\"5ms9th\" data-start=\"745\" data-end=\"762\"\u003eApplications:\u003c\/h3\u003e\n\u003cp data-start=\"763\" data-end=\"1622\"\u003eThe Watts ETX-30 Expansion Tank is widely used in closed-loop hydronic heating systems, hot water boiler systems, radiant floor heating networks, commercial HVAC installations, district heating systems, apartment buildings, schools, hospitals, office buildings, manufacturing facilities, mechanical rooms, heat exchanger systems, and industrial heating applications. The tank absorbs the increased volume of water created during heating cycles, helping maintain stable system pressure, reduce stress on piping components, protect relief valves from nuisance discharge, and extend the service life of boilers, pumps, valves, and associated heating equipment. It is commonly specified in both residential and commercial heating systems where reliable thermal expansion control is essential for safe and efficient operation. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 data-section-id=\"5hg6bl\" data-start=\"1624\" data-end=\"1653\"\u003eTechnical Specifications:\u003c\/h3\u003e\n\u003cp data-start=\"1654\" data-end=\"2516\"\u003e• Manufacturer Part Number (MPN): 0066606\u003cbr data-start=\"1695\" data-end=\"1698\"\u003e• Brand: Watts\u003cbr data-start=\"1712\" data-end=\"1715\"\u003e• Model: ETX-30\u003cbr data-start=\"1730\" data-end=\"1733\"\u003e• Product Type: Pressurized Expansion Tank\u003cbr data-start=\"1775\" data-end=\"1778\"\u003e• Series: ETX\u003cbr data-start=\"1791\" data-end=\"1794\"\u003e• Tank Volume: 4.5 Gallons\u003cbr data-start=\"1820\" data-end=\"1823\"\u003e• Acceptance Volume: 2.5 Gallons at 12 PSI\u003cbr data-start=\"1865\" data-end=\"1868\"\u003e• Connection Size: 1\/2 in. MNPT\u003cbr data-start=\"1899\" data-end=\"1902\"\u003e• Connection Type: Male NPT\u003cbr data-start=\"1929\" data-end=\"1932\"\u003e• Tank Material: Carbon Steel\u003cbr data-start=\"1961\" data-end=\"1964\"\u003e• Finish: Epoxy Coated\u003cbr data-start=\"1986\" data-end=\"1989\"\u003e• Diaphragm Material: Butyl Rubber\u003cbr data-start=\"2023\" data-end=\"2026\"\u003e• Air Precharge: 12 PSI\u003cbr data-start=\"2049\" data-end=\"2052\"\u003e• Maximum Working Pressure: 75 PSI\u003cbr data-start=\"2086\" data-end=\"2089\"\u003e• Maximum Operating Temperature: 220°F (104°C)\u003cbr data-start=\"2135\" data-end=\"2138\"\u003e• Mounting Type: Pipe Mounted\u003cbr data-start=\"2167\" data-end=\"2170\"\u003e• Orientation: Vertical or Horizontal\u003cbr data-start=\"2207\" data-end=\"2210\"\u003e• Service Media: Non-Potable Water\u003cbr data-start=\"2244\" data-end=\"2247\"\u003e• Application: Closed-Loop Hydronic Heating Systems\u003cbr data-start=\"2298\" data-end=\"2301\"\u003e• Function: Thermal Expansion Control and System Pressure Stabilization\u003cbr data-start=\"2372\" data-end=\"2375\"\u003e• Charging Valve: Standard Tire Valve Type\u003cbr data-start=\"2417\" data-end=\"2420\"\u003e• Suitable For: Residential and Commercial Heating Systems \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 data-section-id=\"1cz0398\" data-start=\"2518\" data-end=\"2542\"\u003eCommon Replacements:\u003c\/h3\u003e\n\u003cp data-start=\"2543\" data-end=\"2706\" data-is-last-node=\"\" data-is-only-node=\"\"\u003e• Watts ETSX-30 Free-Standing Expansion Tank\u003cbr data-start=\"2587\" data-end=\"2590\"\u003e• Amtrol Extrol No. 30 Expansion Tank\u003cbr data-start=\"2627\" data-end=\"2630\"\u003e• Bell \u0026amp; Gossett HFT-30 Expansion Tank\u003c\/p\u003e","brand":"Watts","offers":[{"title":"New","offer_id":51731230884142,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/0818\/1038\/files\/Ebay_website_image_0d05b3f6-37e4-42ed-962e-4f216d43bf35.jpg?v=1770595747","url":"https:\/\/plgautomation.com\/products\/watts-0066606etx-30-pressurized-expansion-tank","provider":"PLG Automation ","version":"1.0","type":"link"}