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Expansion Tank

Amtrol ST-12


Expansion Tank Therm-X-Trol Thermal 4.4 Gallon 150 Pounds per Square Inch Gauge 3/4" MNPT ST-12 Non-ASME for Residential Closed Potable Water Systems

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Product Overview

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.

  • 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

Product Details

BrandAmtrol
Product TypeThermal
Tank Capacity4.4GAL
Pressure150PSIG
Inlet/Outlet Connection3/4IN MNPT
Part NumberST-12
StandardNon-ASME
Precharge Pressure50PSIG
Temperature200DEG F
Diaphragm MaterialHeavy Duty Butyl
MaterialSteel
ApplicationResidential Closed, Potable Water Systems
Length11IN
Width11IN
Height15IN
California ResidentsWARNING: Click here for Proposition 65 information.

Commonly Purchased with This Item     
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Shipping & Returns

For Guest transactions, we offer a 30-day SATISFACTION GUARANTEE. If you receive a damaged or defective item or you are dissatisfied with a product for any reason, you can return it for an exchange or refund within 30 days. F.W. Webb Account holders should refer to their local branch for their specific return policy. See our full refund/return policy.

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