How Gas and Electric Dryers Work
Both dryer types operate on the same fundamental principle: circulating heated air through tumbling clothes to evaporate moisture. The key difference lies in heat generation.
Electric dryers use resistance heating elements powered entirely by electricity. The heating coils warm incoming air, which then passes through the drum while it tumbles. This requires continuous electrical supply for both the heating process and the motor.
Gas dryers ignite natural gas or propane to generate heat, then use a small electric motor to circulate the hot air and rotate the drum. Because gas combustion is far more efficient than electric resistance, gas dryers typically use less total energy—but they demand more complex installation with a dedicated gas line and venting, plus built-in safety shutoffs.
Cost Calculation Formulas
Operating costs depend on three variables: energy consumption per load, fuel unit prices, and weekly usage frequency. The equations below show how to compute annual drying expenses for each dryer type.
Electric dryer per load (kWh):
Energy per load = (Wattage ÷ 1000) × Cycle time (hours)
Electric dryer weekly cost:
Weekly cost = Energy per load × Electricity rate × Loads per week
Electric dryer annual cost:
Annual cost = Weekly cost × 52
Gas dryer per load:
Gas consumption = (BTU rating × Cycle time) ÷ Conversion factor
Electric consumption = (Wattage ÷ 1000) × Cycle time
Gas dryer combined weekly cost:
Weekly cost = [(Gas consumption × Gas rate) + (Electric consumption × Electricity rate)] × Loads per week
Gas dryer annual cost:
Annual cost = Weekly cost × 52
Wattage— Heating element power in watts (typically 2,000–6,000 W for electric dryers)BTU rating— Gas burner output in BTU/hour (typically 16,000–22,000 BTU/h for gas dryers)Cycle time— Duration of a single drying cycle in minutes or hoursElectricity rate— Cost per kilowatt-hour (kWh) from your utility billGas rate— Cost per therm or cubic foot of natural gas or propaneLoads per week— Frequency of drying loads in your household
Factors That Determine Your Savings
Regional fuel pricing is the dominant driver. In regions where natural gas is abundant and cheap—parts of the Midwest and South—gas dryers often cost 30–50% less per load. Conversely, where electricity is subsidized or gas expensive, electric dryers become more economical.
Cycle times vary widely. Delicate cycles may last 20–30 minutes; heavy-duty loads can exceed 60 minutes. Longer cycles increase consumption proportionally, making wattage and BTU ratings more impactful.
Household laundry volume matters enormously. A family washing 5–7 loads per week will see larger absolute savings with the cheaper option. A single-person household doing 1–2 loads may find the difference negligible.
Efficiency standards also play a role. ENERGY STAR–certified models—both gas and electric—consume 20–30% less energy than baseline units, narrowing cost gaps.
Common Pitfalls When Comparing Dryers
Avoid these mistakes when calculating which dryer suits your situation.
- Ignoring installation and venting costs — Gas dryers require a new gas line, proper venting, and professional installation—often £200–800 extra. Electric dryers need only a standard outlet or 240V circuit. Factor these into your break-even analysis, not just operating costs.
- Using outdated local utility rates — Electricity and gas prices fluctuate seasonally and annually. Check your latest utility bill for actual rates rather than national averages. A 20% change in gas price can flip the cost advantage entirely.
- Overlooking cycle-time variation — Manufacturer ratings don't account for fabric type, moisture level, or load size. Heavy bedding may take 90 minutes; delicates 25 minutes. Use average cycle times from your machine's manual for realistic projections.
- Forgetting maintenance and repair costs — Gas dryers have more complex electronics and safety systems, leading to higher repair bills over 15 years. Electric dryers are simpler but may need heating element replacement. Factor in expected maintenance when comparing true lifetime cost.
Making Your Decision
Use this calculator to model your specific circumstances: enter your local electricity and gas rates, measure an average cycle time, and input your weekly load count. Run the numbers for both dryer types to see realistic annual costs.
If gas costs significantly less in your region and you plan to stay in your home for 5+ years, a gas dryer's higher upfront cost can be recouped. If electricity is cheap, installation space is tight, or you rent, an electric dryer usually wins on total cost of ownership.
Visit your local appliance showroom to verify wattage and BTU ratings, and ask about ENERGY STAR models—their lower consumption can narrow the gap further.