Therm-X-Trol Water Heater Expansion Tank for Tankless Water Heaters

The Therm-X-Trol ST-1 absorbs thermal expansion and water hammer in tankless and point-of-use water heaters to protect the heat exchanger. Simple to install . the ST-1 features a patented air cell and requires no precharge adjustment or maintenance. With a 304SS waterway and a 7-Year limited warranty . the ST-1 has big protection in a compact size.