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JimmyNJ
Posts: **89**Member

Hi all,

I am hoping that someone could help me figure out if my radiator EDR calculations are valid as I am trying to figure out if my current boiler is undersized (we put an addition on and added a couple of radiators to the system).

First things first - Can someone confirm that I actually identified my radiators correctly as "column" type"? (please see attached pic). For the radiator in the picture I made the following calculations:

38" tall, 3 columns, and 4 sections - so the EDR I calculated was: 5sq per section x 4 sections = 20 sq ft EDR for entire radiator = 4800 BTU steam design output (20x240). Did I do this calculation correct?

I followed the same logic for the rest of my rads using the chart in the link below:

http://www.columbiaheatingsupply.com/page_images/Sizing Cast Iron Radiator Heating Capacity Guide.pdf

I also have a couple of 4 tube rads that are 19" in height and one has 42 sections and one has 18. For those I followed the chart below and made the following calculations:

For the 42 section rad: 67.2x240=16,128

For the 18 section rad: 28.8x240=6912

http://www.ocsind.com/cast-iron-radiators.php

And calculated that for all rads the combined steam design output is: 79449 (although I was unable to figure out a couple of my in-wall/recessed rads (please see attached pics and if someone knows how much they would "add" to my total that would be great.

So am I okay with my little Utica boiler for all the rads in the house? It look like it is rated for 90,000 BTU/HR.

Thanks for any help on this!!

Jimmy

I am hoping that someone could help me figure out if my radiator EDR calculations are valid as I am trying to figure out if my current boiler is undersized (we put an addition on and added a couple of radiators to the system).

First things first - Can someone confirm that I actually identified my radiators correctly as "column" type"? (please see attached pic). For the radiator in the picture I made the following calculations:

38" tall, 3 columns, and 4 sections - so the EDR I calculated was: 5sq per section x 4 sections = 20 sq ft EDR for entire radiator = 4800 BTU steam design output (20x240). Did I do this calculation correct?

I followed the same logic for the rest of my rads using the chart in the link below:

http://www.columbiaheatingsupply.com/page_images/Sizing Cast Iron Radiator Heating Capacity Guide.pdf

I also have a couple of 4 tube rads that are 19" in height and one has 42 sections and one has 18. For those I followed the chart below and made the following calculations:

For the 42 section rad: 67.2x240=16,128

For the 18 section rad: 28.8x240=6912

http://www.ocsind.com/cast-iron-radiators.php

And calculated that for all rads the combined steam design output is: 79449 (although I was unable to figure out a couple of my in-wall/recessed rads (please see attached pics and if someone knows how much they would "add" to my total that would be great.

So am I okay with my little Utica boiler for all the rads in the house? It look like it is rated for 90,000 BTU/HR.

Thanks for any help on this!!

Jimmy

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## Comments

89Member89MemberKitchen one is 20" tall and 22" long

bathroom one is 20" tall, 5" wide, and 13.5" long.

7,864MemberMake sure the piping sizes, layout, etc for the boiler are followed at the minimum.--NBC

4,130MemberEcoSteam ES-20 Advanced Boiler Control

Boiler pictures updated 2/21/15

https://www.facebook.com/media/set/?set=a.10202744301871904.1073741828.1330391881&type=1&l=c34ad6ee78

89Member89Member89Member4,130MemberEcoSteam ES-20 Advanced Boiler Control

Boiler pictures updated 2/21/15

https://www.facebook.com/media/set/?set=a.10202744301871904.1073741828.1330391881&type=1&l=c34ad6ee78

89Member- Jimmy

4,130MemberEcoSteam ES-20 Advanced Boiler Control

Boiler pictures updated 2/21/15

https://www.facebook.com/media/set/?set=a.10202744301871904.1073741828.1330391881&type=1&l=c34ad6ee78

89Member4,130MemberEcoSteam ES-20 Advanced Boiler Control

Boiler pictures updated 2/21/15