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- Amtrol® invented the thermal expansion tank to absorb expanded water in closed, hot water systems and protect the water heater. Since the beginning, we've kept the pressure on our competitors with features they just can't match; like our patented Turbulator™, antimicrobial liner, patent-pending InSight™ service indicator cap and 50 PSIG precharge. When your water heater is on the line, we deliver.
Amtrol® Therm-X-Trol® Thermal Expansion Tank, In-Line, Series: ST Series, 4.4 gal Tank Volume, 3.2 gal Acceptance Volume, 150 psig, ASME Yes/No: No, 11 in Dia, 15 in Height, Drawn Steel, 50 psig Pre-Pressure Rating, 200 deg F Maximum Temperature, MNPT, 3/4 in, Urethane Topcoat, Domestic
- Antimicrobial liner neutralizes bacteria on contact
- Patented Turbulator™ water circulation device
- InSight™ indicator cap tank service alert
- Strongest tank design featuring deep drawn steel and multi-dome construction
- Thickest diaphragm - heavy duty butyl
- Projection welded air stem to help eliminate leaks
- Exclusive ST-1 for tankless water heaters
- Acceptance Volume3.2 galASME Yes / NoNoDiameter11 inHeight15 inPressure Rating150 psigTank Volume4.4 galTypeIn-LineConnection Size3/4 inConnection TypeMNPTDomestic / ImportDomesticFinishUrethane TopcoatManufacturerAmtrolManufacturer #141N43MaterialDrawn SteelMaximum Temperature200Pre-Pressure Rating50SeriesST Series