Usage and Safety 
natural gas applications

Natural gas use is measured by volume in units of 100 cubic feet (ccf). For billing, ccf is converted into therms, a measure of heat content. One therm equals 100,000 British thermal units (Btu). One therm of natural gas is also roughly equal to one ccf.

 

Operating Cost Calculation
Most natural gas appliance ratings are expressed as Btu per hour (Btuh). This rating indicates the amount of energy required (input) or energy produced (output) by the unit. Such information can be found on the appliance nameplate or in the owner’s manual. To calculate the cost of operating an appliance, it is necessary to first convert your natural gas use to therms as follows:

(Btuh Rating ÷ 100,000) x Hours Used = Therms Used

Then, simply multiply the therms used by the price of natural gas. In this brochure, we assume the total average price for natural gas is $1.30 per therm (supply and delivery). Keep in mind the price you actually pay for natural gas may vary, depending on what part of the state you live in and whether you receive your natural gas supply from NYSEG or an alternate supplier.

Example: Calculate the cost to operate a natural gas clothes dryer with a rating of 20,000 Btuh for five hours per month.

(20,000 ÷ 100,000) x 5 hours = 1 therm

1 therm x $1.30 = $1.30 per month

 

Natural Gas Applications

Btu/
Hours

Estimated
Monthly Hours

Energy Use
therms/month

Cost/Month
@ $1.30/therm

 Space Heating

 

 

 

 

 Mid-Efficiency Furnace (80,000 Btuh @ 80% AFUE)

100,000 

 120

120

$156.00 

 High-Efficiency Furnace (80,000 Btuh @ 95% AFUE)

 84,000

 120

101

$131.30

 Hydronic (Hot Water) Boiler (100,000 Btuh @ 85% AFUE)

 105,000

 120

 126

$163.80

 Steam Boiler (100,000 Btuh @ 80% AFUE)

 125,000

 120

 150

$195.00

 Vent-free Room Heater (medium size)

 25,000

 120

 30

$39.00

 Vented Fireplace Inserts/Logs

 50,000

 120

 60

$78.00

 Pilot Light (furnace, water heater, oven)

 300

 720

 2

$2.60

 Water Heating

 

 

 

 

 Water Heater, 30-50 gallon

36,000

 120

 43

 $55.90

 Water Heater, 50-75 gallon

 55,000

 120

 66

 $85.80

 Tankless (On-Demand) Water Heater

 120,000

 30

 36

 $46.80

 Spa/Hot Tub Heater (500-gallon)

 300,000

 20

 60

 $78.00

 Pool Heater (600 sq.ft. area)

 200,000

 60

 120

 $156.00

 Food Preparation

 

 

 

 

 Range (4-burner) & Oven/Broiler

 48,000

15 

7

$9.10 

 - including rangetop burner (Small, 6”)

 6,000

15

 1

$1.30

 - including rangetop burner (Large, 8”)

 9,000

 15

 1

$1.30

 - including oven/broiler (manual or self-cleaning)

 18,000

 15

 3

$3.90

 Self-Cleaning Oven (cleaning only)

 24,000

 15

 4

$5.20

 Outdoor Grill (2-burner)

36,000 

 10

 4

$5.20

 Household Care

 

 

 

 

 Clothes Dryer (25 loads)

 18,000

 40

 7

 $9.10*

 Dishwasher (Natural gas to heat water)

 18,000

 30

 5

$6.50

 Lighting

 

 

 

 

 Outdoor Gaslight

 2,000

 300

 6

 $7.80

 


KEY
AFUE (Annual Fuel Utilization Efficiency) – Used to measure the efficiency of furnaces and boilers where the energy input (in Btu) is divided by the energy output (in Btu).
*For clothes drying, assume 40-minute drying time per load on regular fabric setting.