gravity overheat zone questions

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MrEd

Feeling the Heat
Hearth Supporter
May 9, 2008
426
Rural New England
I am trying to figure out two things.

First, I need to put in an overheat zone for my tarm 60, and it needs to be about 20K BTU (10% of boiler capacity). How do I figure out how much baseboard that corresponds to? I have 2- 6 foot cast-iron baseboards, and also a 14 foot cast-iron baseboard that I would like to use for this purpose if possible (currently surplus).

Second, is it possible to have the gravity/overheat zone plumbed so that it is also serves as a regular zone or is it a dedicated overload-only zone? If you can do it, what would that plumbing schematic look like?
 
Tarm should be able to help on this. I think the manual mentions using a gravity fed zone as the overheat loop. Do the concept drawings in your manual show how to do this?
 
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