pay your bill online

Space Heaters

MTNG carries many different brands, sizes, and styles of both vented and unvented space heaters. Visit your local office and talk with our experienced sales staff about which space heater best meets your needs. All are sold at affordable, installed prices.

Advantages:

  • Non-polluting energy source; environmentally friendly.
  • Available in vent free models, which are excellent as a source of back-up heat.
  • Clean burning--No wood to handle, embers to fear, ashes to clean, or creosote to build up.
  • Much more economical than electric propane or even wood.
  • Instant on/off controllability.
  • Feels warm, is warm. The hot air produced by gas heat, just makes you feel warmer. Most models do not require electricity to operate, making space heaters your best friend when the power goes off on a long winter's night.
  • Better temperature control for comfort, safety, and efficiency.
  • Installation options to suit nearly every application.
  • Large variety of styles and models available to suit individual needs.
  • Feels warm, is warm. The hot air produced by gas heat, just makes you feel warmer.

Gas Space Heat Required by Square Footage

BTUs Required
Square Feet 200 400 600 800
Well Insulated 6,400 12,800 19,200 25,600
Average 10,000 20,000 30,000 40,000
Poorly Insulated 12,800 25,600 38,400 51,200
BTUs Required
Square Feet 1,000 1,200 1,600 2,000
Well Insulated 32,000 38,400 51,200 64,000
Average 50,000 60,000 80,000 100,000
Poorly Insulated 64,000 76,800 102,400 128,000

THIS TABLE IS FOR QUICK REFERENCE ONLY. EVERY APPLICATION IS DIFFERENT AND THERE ARE MANY FACTORS TO CONSIDER.  
Notes: 
* This table does not distinguish between vented and unvented heaters. 
* It utilizes formulas that have been used by Middle Tennessee Natural Gas employees. 
* The "well insulated" rating is calculated using 4 BTUs per cubic foot and a ceiling height of 8 feet. 
* The "average" rating is calculated using 50 BTUs per square foot. 
* The "poorly insulated" rating is calculated using 8 BTUs per cubic foot and a ceiling height of 8 feet.

Operating Cost Comparison:

Let's say that you have determined from the sizing table that you need 30,000 BTUs per hour to heat your space. In order to provide an output of 30,000 BTUs per hour, a vented gas space heater that is 75% efficient, for example, should be sized at 40,000 (40,000 x .75 = 30,000). A vent-free space heater that is 99.9% efficient should be sized at 30,030 BTUs per hour (30,030 x .999 = 30,000).

To find the properly sized electric heater, we must remember that 29.3 kWs are required to create 100,000 BTUs. Multiply 29.3 by .3 to get the number of kWs needed to provide 30,000 BTUs per hour. The answer is 8.79 kWh.

For this example, let's use a natural gas cost of $.70 per therm, a propane cost of $1.00 per gallon, and an electricity cost of $.07 per kW. The calculations to get 30,000 BTUs output would look like this: The answer is 8.79 kWh.

You can use the same method for calculating operating costs for any size and efficiency space heater.

Natural Gas Vented 75% Efficient $.70 x 1 x 1.33=$.93 (for 100,000 BTUs output) 
$.93 x .3 = $.28
Natural Gas Vent-Free 99.9% Efficient $.70 x 1 x 1.00 = $.70 (for 100,000 BTUs output) 
$.70 x .3 = $.21
Propane Vented 75% Efficient $1.00 x 1.1 x 1.33 =$1.46 (for 100,000 BTUs output) 
$1.46 x .3 = $.44
Propane Vent-Free 99.9% Efficient $1.00 x 1.1 x 1.00 =$1.10 (for 100,000 BTUs output) 
$1.10 x .3 = $.33
Electric $.07 x 8.79 = $.62 (for 30,000 BTUs output)

Selecting a Space Heater:

Natural Convective Heaters:(Standard Vented Space Heaters)

Uses natural circulation created in the room to distribute heated air. As the air is warmed by the heater, it becomes lighter and naturally rises. The rising warm air displaces cooler air at the ceiling and forces it downward where it is heated and the cycle continues.

  • Creates even warming throughout the room.
  • Can be thermostatically controlled (optional) to automatically maintain comfortable room temperatures.
  • No electricity required.

Forced Convective Heaters:(Standard Vented Space Heater with Blower)

Similar to natural convective heaters but with the addition of an electric blower to help with the movement of heated air.

  • Creates even warming throughout the room.
  • Can be thermostatically controlled (optional) to automatically maintain comfortable room temperatures.
  • Requires electricity to operate the blower. Some blowers are thermo-statically controlled so that they only operate when temperatures surrounding the heater require additional air circulation.

Radiant (Infrared) Heaters:(Standard Unvented Space Heater)

The gas flame is used to heat ceramic panels which, in turn, glow bright red. The heat given off by these panels warms objects in its path in much the same way as the sun warms objects. The room air is not heated directly, but the warmth from the heated objects serves to heat the air gradually.

  • Most often used as a back-up source of heat.
  • Best for heating people and objects that are fairly stationary in the path of the glowing panels.
  • Not as useful for heating whole rooms or sections of a house.
  • Can be thermostatically controlled to maintain an even temperature in the area of the glowing panels.
  • Can be used with a blower to better circulate heated air around room.
">