Amtrol ST-5 (Therm-X-Trol) is a water heater expansion tank, designed for use in domestic hot water heating systems to eliminate the potential hazards of water. Get the Therm-X-Trol Expansion Tank ST-5, easy to install helps eliminate BTU and water waste from The Home Depot. Ships in 1 Week. Buy AMTROL ST-5 on and get the best price.

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Use the proper sized wrench for the job and snug it down. Both are intended to control the high end pressure of your boiler system and keep the relief valve from opening due to increased system pressure caused by the expansion of water. Thermal expansion occurs as domestic water is heated.

Very well made and sturdy tank. Replaced exact same model that had failed. Rates range from 6.

AMTROL ST-5 Thermal Expansion Tank – Water Heaters –

If it is gonna be “code” eventually in my city. I don’t know why the bladder on the first went bad but we have some pretty high water pressure so maybe that’s it. Click here for Proposition 65 warning. Fired up the boiler and it all came back to temp and pressure without incident. There was a problem filtering reviews right now.


What other items do customers buy after viewing this item? Get a new expansion tank!

Technical Details

A “heat trap” is recommended with most water heater manufactures. This is a good value xmtrol would recommend it to anyone installing a new expansion tank. See all reviews. Amtrol invented the thermal expansion tank to control pressure build-up in closed, hot water systems. Would you like to tell us about a lower price?

Shopbop Designer Fashion Brands. Please make sure that you are posting in the form of a question. So I adjusted the pressure of the new tank to 64 psi took it to a local gas station air machine, and verified with manual tire pressure gauge. AmazonGlobal Ship Orders Internationally. Learn more about Amazon Giveaway. Plain steel tanks have no moving parts, and require a separate pressure reducing valve to maintain initial fill pressure of 12 psi or higher depending upon the requirements of your system.

English Choose a language for shopping. One interesting caveat; the unit comes pre-pressurized at 50 psi.


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Top Reviews Most recent Top Reviews. There are two basic expansion tank types: If in doubt, look for some online videos for guidance on the whole procedure. View Cart Proceed to checkout. Add all three to Cart Add all three to List.

Does your boiler blow off steam? No more crazy high pressure after showers or baths while the water heater builds pressure up. Specifications Expansion Tank Type There are two basic expansion tank types: Please try your search again later. Turn on 1-Click ordering for this browser. Buy with confidence as the condition of this item and its timely delivery are guaranteed under the “Amazon A-to-z Guarantee”.

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Our cold water inlet pressure measured at our front and rear outdoor faucets was 64 psi. Easiest way to get the exact part. Water heater manufacturers and plumbing codes require the installation of an expansion control device if a backflow preventor, pressure reducing valve or check valve is installed in the domestic supply line.

Testing monthly for failure is easy – just tap either end and listen for the sound to change from a thud water to a ringing air. Total Items in Cart: As the system water temperature reaches its maximum, the diaphragm flexes against the air cushion to allow for the increased water expansion.

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