﻿ NYSEG | Natural Gas Applications
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 EstimatedMonthly Hours Energy Usetherms/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.