Brochure

Tunstall Corporation
118 Exchange Street • Chicopee, MA 01013
We reserve the right to alter designs, specifications and information without notice.
Phone [phone] · Fax [phone]
www.tunstall-inc.com • www.maconcontrols.com
Bulletin-NTSPEC-0714
Warranty & Engineering Data
Helpful Heating Hints
HELPFUL HEATING HINTS
• 1 sq. ft. steam radiation in a room at 70° gives off 240 BTU/hr.
• 1 boiler horsepower is equivalent to 134 sq. ft. of steam radiation.
• 1 gal. of oil per hour heats 400 sq. ft. of steam radiation in 0°F weather.
• 1/3 gal. of oil per hour produces 1 boiler horsepower.
• 1 lb. of steam per hour is equivalent to 4 sq. ft. EDR.
• 1 lb. of steam per hour produces 1000BTU/hr.
• 1 boiler horsepower equals 33,500 BTU/hr.
• 1 kw equals 3412 BTU.
• 1 ton of refrigeration equals 12,000 BTU/hr.
• When multiple zoning and existing single zone system, be sure to install a condensate
pump and vacuum breakers to avoid water hammer and related problems.
• On steam to water heat exchanges with steam in the shell, a vacuum breaker is re-
quired to break any induced vacuum.
• 1 GPM flowing through a heating system produces 10,000 BTU/hr. based on 20°F
temperature drop.
• Based on a 20°F temperature drop:
¾” copper will handle up to 35,000 BTU
1” copper will handle up to 75,000 BTU
1-1/4” copper will handle up to 130,000 BTU
1-1/2” copper will handle up to 200,000 BTU
• To estimate heat loss for a concrete block warehouse with average amount of glass,
multiply length x width x height x 6 to arrive at BTU/hr.