Thermolec Application &Technical Notes - Manual (Page 64)

How to evaluate your heating requirement?
Considering today’s insulation standards, an easy to remember rule of thumb is that the
heating capacity should be equal to 8 watts per square foot. A 1 KW heater would then be
sufficient to heat a surface of 1000 ÷ 8 = 125 square feet. Adding a safety factor would bring
the surface to approximately 120 square feet, i.e. a 12’ x 10’ room.
We suggest:
Up to 120 sq. ft.
1 KW
from 121 sq. ft. to 240 sq. ft. 2 KW
from 241 sq. ft. to 360 sq. ft. 3 KW, and so on.
A small excess of capacity is not a problem because the electronic controller will modulate
this capacity in order to give only the heat required by the thermostat.
How to evaluate the ventilation requirements?
A THERMO-AIR or THERMO-ZONE requires a minimum of 30 CFM (cubic feet per minute)
per Kilowatt to operate.
A lower air flow is not a problem for the heater since the electronic controller will automatically
reduce the heating according to the air flow.
For a quick calculation, a 1 KW unit requires a minimum of 30 CFM,
a 2 KW unit requires a minimum of 60 CFM, and so on.
Electrical connections
We recommend not to exceed 2 KW at 120V, 5 KW at 208V, 6 KW at 240V, 7KW at 277V,
8KW at 347V.
THERMO-AIR & THERMO-ZONE