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Boiler Expansion Tank Market Value
Analysis of 1,368 eBay listings for boiler expansion tanks.
What you'll usually pay
$35.24 typical price
Most are between$16–$58
Brand new$35.61
Used$39.99
On sale now1,368
💡 Used ones cost about 12% more here.
👉 In short easy summary
The best value is found in metal tanks, which are 26% below the market median. Aluminum and brass options command the highest premiums at 43% above the median.
Price by material
Why? Prices range from 26.19 for metal to 50.3 for brass.
Price by year manufactured
Why? Newer 2021 models are 55% more expensive than the median, while 2010 models are 15% cheaper.
🛒 Some on sale right now
Common questions
What is the median price for a new boiler expansion tank?
The median price for new units is 35.61.
Are used expansion tanks more expensive than new ones?
Yes, the used median is 39.99 compared to the new median of 35.61.
Which material is the most affordable option?
Metal tanks are the most affordable with a median price of 26.19.
How we got these numbers
Worked out from 200 live eBay listings (price range $16–$58, odd outliers ignored). These are asking prices, so use them as a guide. Last checked July 26, 2026.