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Need help determining steam boiler size
WES55
Member Posts: 2
I would appreciate it if someone could help me determine the
proper size WeilMcLain steam boiler based on the supplied square feet of
radiation that I have listed.
Burnham slenderized radiators:
*All six (6) radiators are FOURTUBE and measure 4 7/16” WIDE
Radiator 1 25” High 22 Sections
Radiator 2 25” High 22 Sections
Radiator 3 25” High 34 Sections
Radiator 4 25” High 26 Sections
Radiator 5 25” High 22 Sections
Radiator 6 22” High 8 Sections
Base board hot water loop = 27 feet
Based on the supplied square feet of radiation (radiators
1thru 6 and the hot water loop) what size WeilMcLain steam boiler should I use
a 4 or 5 section?
Also, would an additional hot water loop in the basement (approximately
50 feet) require the next larger sized steam boiler?
I would like to thank one and all who contribute to the
success of this website, especially Dan Holohan. Thank you.
proper size WeilMcLain steam boiler based on the supplied square feet of
radiation that I have listed.
Burnham slenderized radiators:
*All six (6) radiators are FOURTUBE and measure 4 7/16” WIDE
Radiator 1 25” High 22 Sections
Radiator 2 25” High 22 Sections
Radiator 3 25” High 34 Sections
Radiator 4 25” High 26 Sections
Radiator 5 25” High 22 Sections
Radiator 6 22” High 8 Sections
Base board hot water loop = 27 feet
Based on the supplied square feet of radiation (radiators
1thru 6 and the hot water loop) what size WeilMcLain steam boiler should I use
a 4 or 5 section?
Also, would an additional hot water loop in the basement (approximately
50 feet) require the next larger sized steam boiler?
I would like to thank one and all who contribute to the
success of this website, especially Dan Holohan. Thank you.
0
Comments

WM Eg35
This is assuming that its a gas boiler and that the mains are insulated. when you refer to the 27' and 50' of baseboard is that the amount of actual baseboard or the total lenth of the loop including the pipes/tubing? Is there a reason that you are only considering WM? Good luck0 
Steam Boiler Size.
Each section of those radiators, 4 tube, at 26" high has 2.75sq ft. On the 23" rad, its 2.5. Multiply that by the number of sections, then by 240 to get the btu. If the piping is well insulated, you probably dont need to add for piping loss, but if most is uninsulated, add 1015%.
As far as adding for a wet loop off the bottom of the boiler, you will have to add those btu's in as well.0 
Steam boiler
Sorry to disagree Gregg. On a steam boiler there is generally a 33% pickup factor added for insulated pipes and a 50% pickup factor for uninsulated pipes. Also as long as the BTU output of the hot water loop is within the pickup factor we don't add add anything for the loop0 
PIck Up Allowance
We are in Maine, with a very cold climate, and have been doing steam for a long time, and I have never heard of anything near a 50% allowance. 25%, yes, but I believe that even that is excessive in most cases, but I sure am not averse to learning something new.0 
what size to install
this might be a good situation for a modulating burner, controlled by pressure, since there could be some question as to what size boiler to buy.nbc0 
Additional info and question
Thanks for the replies. I would like to add that this is an oil burner and a onepipe steam system. I hope someone can correct me if I am wrong in my calculations. Using the book E.D.R. (Ratings for Every Darn Radiator by Dan Holohan) the six (6) Burnham radiators listed produce a total of 57,504 BTU’s times a 1.33 pickup factor equals 76,480 BTU’s. This figure does include the hot water baseboard loop.
Is my calculation correct?What do I have to add for the 27’ hot water baseboard loop? The baseboard loop is fed by a 25 foot supply and return line (a total of 50
additional feet of copper pipe).
Would you recommend a 3, 4, or 5 section WeilMcLain steam boiler?0
This discussion has been closed.
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