Amtrol invented the thermal expansion tank to control pressure build-up in closed, potable water systems. This prevents the water heater pressure relief valve from opening, saves energy and eliminates a potential safety hazard. All Therm-X-Trol expansion tanks are
made in our ISO 9001:2015 certified facility.
The Therm-X-Trol ST-1 absorbs thermal expansion and pressure surge in tankless and point-of-use water heaters to protect the heat exchanger. Simple to install, the ST-1 features patented air cell technology and requires no precharge adjustment or maintenance. With a 304 stainless steel waterway and a 7-year limited warranty, the ST-1 delivers big protection in a compact size.
Features
- Patent Pending Antimicrobial Liner Neutralizes Bacteria on Contact.
- Patented Turbulator® Water Circulation Device.
- Patented InSight® Indicator Cap Tank Service Alert.
- Highest Precharge – 50 PSIG.
- Strongest Tank Design Featuring Deep Drawn Steel and Multi-Dome Construction.
- Thickest Diaphragm – Heavy Duty Butyl.
- Projection Welded Air Stem to Help Eliminate Leaks.
- Stainless Steel System Connection.
- In-Line Models Available in 2.0, 3.2 and 4.4 Gallon sizes.
- Freestanding Models Available in 10.3 through 86 Gallon sizes.
- Exclusive ST-1 for Tankless Water Heaters.
Performance
- Max. Operating Temperature: 200º F (93º C)
- Max. Operating Temperature for ST-1: 140º F (60º C)
- Max. Working Pressure: 150 PSIG (10.3 bar)
- Warranty:
- ST-1 through ST-12: 7-Year Limited
- ST-25V through ST-210V: 1-Year Limited
Application
- For use in closed, potable hot water systems to control pressure build-up and protect the water heater.
- Accepts expanded water as system temperature rises and returns hot water to the system when demand occurs.
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