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Here's the particulars:
Local school had a fire sprinkler system installed.
The exposed mains run up inside an unheated brick stair tower.
15'w x 20'l x 4 stories high. Very loose old construction, no insulation, 2 interior walls, 2 exterior walls, (2) doors to exterior, (4) 12 sq ft single pane windows. Phila zip code.
We have been asked to provide enough heat to protect the pipes from freezing in winter. Maintain 40*?
We recommended insulation to protect the pipes, but any ideas how to calculate a load for this application?