Capitol Steam Boiler

Mark Elmer

I have a customer with a Capitol 25-5 boiler. The boiler inspector wants to know the minimum relief valve capacity. I was wondering if anyone had any actual factory information more than just using how it is fired today.

Steamhead (in transit)

I would assume

it's a rather large boiler since it requires inspection. There were several Capitol 25-5 boilers made back in the day, the largest of which had a rating of 1375 square feet of steam radiation. You'd probably fire this one at something like 4 GPH on oil, which equals an input of 560,000 BTU per hour.

This is probably the number the inspector would want.

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[Deleted User]

Tom Byrley's

Hydronic Rating Handbook gives the Capitol 25B (25-5) a NET steam rating of 1,265 sq ' or 303,600 btus. Before 1958, when that boiler was built, NET was 68% of GROSS output. Or 446,500 btus.