Gas Appliance Usage Guide

Please download the Flash plug-in to view the interactive contents of this page.

Use Energy Wisely
Household appliances consume as much as 20% of the total energy used in your home, so it makes sense to use them wisely. To make more informed choices about how you use natural gas appliances and equipment, you first need to know how much energy your natural gas appliances or equipment are using.

To estimate how much it will cost you to operate a natural gas appliance or piece of equipment each month, you need to do three things:

  • Determine how many therms that appliance or piece of equipment uses each month.

  • Determine your cost per therm rate. Your cost per therm rate can be found on your paper bill or on our website. Sign in to your account to get actual historical usage as well as your rate. Please make sure you are using the most current rate.

  • Calculate the natural gas usage and expense. (Remember, your calculations will be approximate.)

Determine therm usage
If you do not know how many therms the appliance or piece of equipment uses, there are a couple of ways to find out.

  • Locate the fuel rating plate attached to the appliance or piece of equipment. This will tell you its hourly BTU input as determined by the Underwriter's Laboratories (UL), the American Gas Association (AGA), and CSA International. If you can't locate the BTU rating plate or if the information is illegible, use the chart below. (Remember, these hourly and monthly therm usage estimates are based on SCE&G system-wide averages; the energy used by your specific appliance or piece of equipment may vary.)

  • Estimate the number of hours each month you operate that appliance or piece of equipment. It may be difficult to determine how many hours you operate a furnace or water heater because thermostats control them automatically. You may want to use the SCE&G Customer Natural Gas Appliance Usage chart below.

Determine your cost per therm rate.
Your cost per therm rate can be found on your paper bill or on our website. Sign in to your account to get actual historical usage as well as your rate. Please make sure you are using the most current rate.

Calculate your natural gas appliance usage for each appliance or household equipment.

Use the following example to calculate the monthly therm usage for your appliance.

For Example:
Suppose your gas logs have a 24,000 BTU hourly input rate, and that you burn your logs for 3 hours for 18 days per month. You can calculate the hourly therm usage as follows:

24,000 BTU x 3 hours x 18 days = 1,296,000 BTU's per month

1,296,000 BTU per month
_____________________= 12.96 therms
100,000 BTU per therm

12.96 therms x $1.10* per therm = $14.26 estimated monthly cost of natural gas to operate your logs.

*Based on Rate 32V Residential Value Service – The 12-month average price for Rate 32V for 2014 is listed, not including monthly Basic Facilities Charge.

SCE&G Customer - Natural Gas Appliance Usage
These hourly and monthly therm usage estimates are based on system-wide average use by our residential customers.
Natural Gas Appliance or Equipment
Estimated Monthly Energy Use
Estimated Hourly Energy Use
Furnace
100 therms*
Vented Gas Logs
(3 hours per day,15 days per month)
29.25 therms*
.65 therms
Vent-Free Gas Logs
(3 hours per day,15 days per month)
18 therms*
.4 therms
Water Heater
18 therms
Space Heater
(3 hours per day)
18 therms
.2 therms
Tankless Water Heater
15.5 therms
Clothes Dryer
3.5 therms
Cook Top
2 therms
*Based on monthly usage October through March.

Remember the amount of energy used by your natural gas appliances and household equipment will vary based on the size and construction of your home, and the BTU input value and efficiency of the natural gas appliances or equipment you have.

Follow scegnews on Facebook Follow scegnews on Twitter Subscribe to me on YouTube SCE&G is a BBB Accredited Electric Company in Cayce, SC