Gary Please take a look at the expansion tank sizing tables given above on this page - as that gives the most-accurate answer to your question. Please don't hesitate to ask further if any of that is unclear.

You'll also choose between (using Amtrol / Extrol as an example) an expansion tank that includes a fill valve (Amtrol Fill-Trol) and one that does not (Amtrol-Extrol) the latter means you're using an external or separate boiler fill valve.

Try the search box just below, or if you prefer, post a question or comment in the Comments box below and we will respond promptly.

I think that most heating service techs eyeball the system and pick what they guess is a safe (big) expansion tank from the range of standard sizes they've seen in residential properties.

In other words, unless you're an HVAC design engineer you would probably eschew measuring the number of linear feet of pipe, and its diameter and counting the number of radiators and adding the volume of these to that of the boiler. Instead you'd choose a reasonable model from the rather short list of what's actually sold.

We include links to additional expansion tank sizing guides from equipment manufacturers such as Amtrol / Extrol and PEX as well as links to online calculators that can give an expansion tank sizes based on known water volume of the heating system.

Continue reading at FIND the EXPANSION TANK or select a topic from the closely-related articles below, or see the complete ARTICLE INDEX.

Watch out: these are "ballpark" data points. Check with the installation and maintenance manual for your heating system, with its manufacturer, and with your local heating equipment service company or supplier for their opinon on accurate boiler xpansion tank sizing.

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Shown here is a gray cylindrical ceiling-mounted traditional bladderless expansion tank for a hot water heating boiler using cast iron baseboard heat in most of the building with a radiant floor slab in one small room.

Thank you for the nice comment, Rod. We're glad that you found it useful. We also welcome questions and critique. Working together is good for both of us.

This article series explains how to identify, inspect, install, repair, or service heating boiler expansion tanks: here we explain the function of expansion tanks on hot water (hydronic) heating systems.

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Watch out: these are "ballpark" data points. Check with the installation and maintenance manual for your heating system, with its manufacturer, and with your local heating equipment service company or supplier for their opinon on accurate boiler xpansion tank sizing.

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This data is for hydronic heating boilers - that is, building heating systems. It is not intended to size thermal expansion tanks for domestic hot water heaters. See the references below.

The technical factors in boiler expansion tank size include total volume, operating temperature, and starting operating pressure.

To use these boiler expansion tank sizing charts you need to know just the type of heating system radiation used: finned copper baseboard, convectors/unit heaters, cast iron radiators, or cast iron heating baseboards and the heat output of the heating boiler in 1000s of BTUs / Hour or Output BTUh.

There are actually just a few typical expansion tank model sizes (and thus model numbers) and some heating companies map those against boiler net BTUH output and the type of heating system: finned copper baseboard, convectors/unit heaters, or radiators, or cast iron baseboard

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I'm in trade school for HVAC and we were sizing expansion tanks and we have some expansion tanks that are undersized and some that are oversized. The question was posed: how much can you undersize and oversize the expansion tanks on a hot water boiler?

Understand that for hot water heating boiler expansion tank sizing calculations, you need to take the system volume, temperature differential, etc. into account.

Photo: an Amtrol Fill-Trol expansion tank that incorporates a brass fill-valve - just visible under the air-scoop/air purger and found on the top of this expansion tank.

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Expansion tank sizing: In a very large old home, there is a huge boiler(size of a small car) and an old style expansion tank in the rafters. The tank recently started leaking, so I'd like to replace it with the newer bladder type.

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This data is for hydronic heating boilers - that is, building heating systems. It is not intended to size thermal expansion tanks for domestic hot water heaters. See the references below.

This data is for hydronic heating boilers - that is, building heating systems. It is not intended to size thermal expansion tanks for domestic hot water heaters. See the references below.

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EXPANSION TANK SIZING GUIDE at InspectApedia.com - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice.

I ha 8 small radiator. Thete is a new peerless boiler. Installed 100.000 btu 1/2 pipe goung to extro l. 30 there us no expansion trouble. On running or off

Watch out: these are "ballpark" data points. Check with the installation and maintenance manual for your heating system, with its manufacturer, and with your local heating equipment service company or supplier for their opinon on accurate boiler xpansion tank sizing.

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But with a house so large with dozens of radiators & seemingly miles of piping, I can't begin to imagine how you could calculate the total volume. Isn't there a way to make this determination using the size of the old expansion tank? Its 12" x 60", so about 30 gallons. Thanks for the help.

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This data is for hydronic heating boilers - that is, building heating systems. It is not intended to size thermal expansion tanks for domestic hot water heaters. See the references below.

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Watch out: these are "ballpark" data points. Check with the installation and maintenance manual for your heating system, with its manufacturer, and with your local heating equipment service company or supplier for their opinon on accurate boiler xpansion tank sizing.

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I agree this is an onerous task - expansion tank sizing. Typically the big manufacturers offer a calculator that begins by requiring you to enter exactly what you don't know: the total water volume of the system.