Category:Express boilers
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Express boilers were water-tube boilers with small diameter tubes (typically 2" or less), so as to have the greatest ratio of heating area to water volume.
Other "large tube" boilers, such as the Stirling boiler, had tubes of 3" and over.
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Pages in category "Express boilers"
The following 2 pages are in this category, out of 2 total.
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