North Itasca Electric Co-operative, Inc

Design Rules of Thumb

The design rules below are intended for informational purposes only. They are based on new home construction using the latest technologies and standards. One should have a heat loss calculation done by a professional to insure a proper system is designed.

North Itasca Electric is able to help you in these calculations. If you desire assistance, call 1-800-762-4048 or 218-743-3131 Monday thru Friday 8:00 AM to 4:30 PM (Winter hours) or Monday thru Friday 7:00 AM to 3:30 PM (Summer hours).

Electric boilers:

  • If you are looking for just a little additional warmth, figure 6 watts per square foot.
  • If you are looking for 100% space heating on our Dual Fuel program figure 9 to 10 watts per square foot.
  • If you are looking for 100% space heating with Storage program figure 15 to 17 watts per square foot.

Plenum Heaters:

Plenum heaters can be sized using 8 to 10 watts per square foot with 8 foot ceilings.

  • Use 15 kW models in structures 1500-2000 square feet.
  • Use 20 kW models in structures 2000-2500 square feet.

A minimum air flow of 1000 CFM's is needed for 15 kW plenum heaters with proper ductwork installed and about 10 registers.

A minimum air flow of 1200 CFM's is needed for 20 kW plenum heaters with proper ductwork installed and about 12 registers.


Steffes Furnace:

The sizing of brick storage units receiving 8 hours of charge each day:

Square foot Method:

  • Basements:
    Square feet x 8' ceiling x 1.75 = Btu's
  • First floor:
    Square feet x 8' ceiling x 2.75 = Btu's

Cubic foot method:

  • 2.75 Btu's heat loss per cubic foot for the upper level and 1.75 Btu's heat loss per cubic foot for the basement.
  • Home on slab or crawl space:
    3.1 Btu heat loss per cubic foot for all areas.




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