How Much Does an Electric Blanket Cost to Run in South Africa?

Electric blankets provide direct personal heating, and their electricity cost depends on the blanket's power rating, heat setting and usage. Learn how to calculate what your electric blanket costs to run based on your specific blanket and electricity tariff.

Electric blankets provide direct personal heating rather than heating an entire room. Their electricity consumption depends on the blanket's power rating, heat setting, usage time and temperature-control system. Understanding these factors can help you estimate your electricity costs during colder months.

The cost to run your electric blanket depends on two main things: how much electricity your blanket consumes, and your electricity tariff (the rate you pay per kWh). This guide explains how to understand and calculate your electric blanket's electricity cost.

How Much Electricity Does an Electric Blanket Use?

Electric Blanket Consumption Varies by Type and Settings

Different electric blankets consume different amounts of electricity. There is no single universal figure that applies to every blanket. Consumption depends on several factors:

• Blanket size: Larger blankets (double bed vs. single) require more power
• Heating element power: Usually 60–200 watts depending on the model
• Heat setting: Multiple heat levels affect power consumption (low, medium, high)
• Controller type: Some blankets have simple on/off, others have variable temperature control
• Blanket age: Older blankets may be less efficient than modern models
• Fabric and insulation: Material quality affects how efficiently heat is retained
• Thermostat control: Blankets with built-in thermostats cycle heating on and off to maintain temperature
• Usage patterns: How much of the blanket is actually under you while in use

Electric Blankets vs. Space Heaters

Electric blankets and space heaters operate differently and can have different power ratings. An electric blanket is designed to provide direct personal warmth, while a space heater is designed to heat the surrounding room. To compare their electricity costs, use the actual power rating and operating time of each appliance.

Typical Electric Blanket Wattage

A typical household electric blanket uses 60–200 watts, depending on size and heat setting. Most standard single-bed blankets use 75–120 watts, while double-bed blankets may use 120–200 watts. Check your blanket's rating plate or manual for the exact power consumption at different heat settings.

How Do You Calculate Electric Blanket Electricity Cost?

The Basic Calculation

Calculating electric blanket electricity cost follows the same basic formula as any appliance:

Power (watts) ÷ 1,000 = Power (kilowatts)

Power (kilowatts) × Hours used per night = Energy (kWh)

Energy (kWh) × Electricity tariff (R/kWh) = Cost (R)

Note: One kWh is commonly called one "unit" of electricity on your electricity bill.

Important Consideration: Seasonal Usage

Unlike appliances used year-round, electric blankets are typically used seasonally during winter months:

• Heavy use: May–September in South Africa (5 months)
• Light use: April and October (shoulder months)
• No use: November–March (summer months)
• Your annual cost should account for seasonal usage patterns

For a more realistic annual estimate, consider calculating monthly usage during the months when you actually use the blanket.

Illustrative Electric Blanket Electricity Cost Example

Hypothetical Example (For Illustration Only)

This example uses fictional figures to show how the calculation works. Your actual blanket costs will depend on your blanket's power rating, your usage patterns (seasonal), and your own electricity tariff. This is not a current South African tariff.

Hypothetical scenario:

Electric blanket power rating: 100 watts (medium setting)

Usage: 8 hours per night (winter months only)

Winter usage: 5 months (May–September)

Hypothetical electricity tariff: R3.50 per kWh (illustrative example only)

Winter Month Calculation (June as example):

Power: 100W ÷ 1000 = 0.1 kW

Daily consumption: 0.1 kW × 8 hours = 0.8 kWh per night

Weekly consumption: 0.8 kWh × 7 nights = 5.6 kWh per week

Monthly consumption: 0.8 kWh × 30.4375 days = 24.35 kWh per month

Daily cost: 0.8 kWh × R3.50 = R2.80

Weekly cost: 5.6 kWh × R3.50 = R19.60

Monthly cost (June): 24.35 kWh × R3.50 = R85.23

Winter season cost (5 months): 121.75 kWh × R3.50 = R426.13

Annual cost (5-month winter use): R426.13

Important: This example assumes a 100W blanket used 8 hours per night during a 5-month winter season at a flat R3.50/kWh tariff. Your actual blanket cost depends on your blanket's power rating, your actual usage patterns, seasonal variation, and your electricity provider's tariff, which may be different, may include fixed charges, or may use tiered pricing. This example is for illustration only and does not represent current South African prices.

Why Electric Blanket Electricity Costs Can Vary

Usage Pattern Factors

• Hours per night: Using the blanket 6 hours costs less than 10 hours per night
• Heat setting: Different heat settings can use different amounts of electricity. Check the blanket's documentation for the power consumption associated with each setting.
• Seasonal usage: Heavy winter use (May–September) vs. light shoulder season use (April, October)
• Number of blankets: Using multiple blankets (one per person) increases total consumption
• Usage days per week: Using every night costs more than 4–5 nights per week

Blanket-Related Factors

• Blanket size: Single-bed blankets use less power than double-bed blankets
• Heating element power rating: Power rating directly affects electricity consumption
• Blanket type: Underblanket vs. overblanket designs may have different efficiency
• Age and condition: Older blankets may have degraded heating elements or insulation
• Temperature control: Thermostat-controlled blankets may cycle the heating element on and off to maintain the selected temperature.

Environmental and System Factors

• Ambient temperature: Very cold nights may require higher heat settings
• Bedroom location: Ground-floor or external-wall bedrooms are colder
• Bedding insulation: More blankets over the electric blanket reduce needed heat output
• Electricity tariff: Different municipalities and providers charge different rates

Tariff Structure Matters

Your actual electricity cost also depends on your provider's tariff structure:

• Flat rate: Same price per kWh regardless of consumption
• Tiered tariff: Rate increases as you use more electricity; blanket cost depends on total household usage
• Time-of-use rates: Different rates for peak and off-peak hours
• Fixed charges: Monthly base charge separate from per-kWh rates

How Can I Reduce My Electric Blanket Electricity Cost?

Practical Ways to Lower Electric Blanket Energy Use

1.

Use the lowest comfortable heat setting

Use the lowest heat setting that is comfortable for you, while following the manufacturer's instructions for safe operation. Power consumption can vary between heat settings and blanket models.
2.

Limit usage to sleeping hours only

Use the blanket only when in bed, not for watching TV or sitting up, to minimize daily consumption.
3.

Add extra bedding insulation

Additional bedding can help retain warmth. Follow the manufacturer's instructions about how the blanket should be covered and used.
4.

Use any preheat function according to the manufacturer's instructions

If your blanket has a preheat function, follow the manufacturer's instructions for its use and duration.
5.

Use a blanket timer if available

If your blanket has a timer, set it to turn off after a few hours, as you'll be warm once asleep.
6.

Maintain your blanket properly

Keep the blanket clean and check for visible damage. Check the blanket regularly for visible damage, wear or other signs that it may no longer be safe to use.
7.

Insulate your bedroom better

Seal drafts, use curtains, and improve ventilation to reduce overall bedroom heat loss.

Safety Reminder

Electric blankets have safety guidelines: do not fold or crease when in use, do not use near water, check for damage before each use, and follow manufacturer instructions carefully. Follow the manufacturer's guidance on the expected service life of the blanket and replace it if it shows signs of damage, excessive wear or other safety concerns.

Calculate Your Electric Blanket's Actual Electricity Cost

The What Does It Cost? calculator lets you enter your blanket's power rating, nightly usage hours, days per week, and your electricity tariff to get a personalised estimate of your blanket's monthly and yearly costs.

You can enter:

• Your blanket's power rating in watts (at the heat setting you typically use)
• Quantity (if you have multiple blankets)
• Hours per night the blanket is in use
• Days per week (e.g., 5 for weeknight use only)
• Your electricity tariff (R per kWh from your electricity bill)

The calculator will show estimated daily, weekly, monthly, and yearly costs. Remember to account for seasonal usage when calculating annual costs.

Open the Calculator

How to Get a More Accurate Electric Blanket Electricity Estimate

Find Your Blanket's Power Rating at Different Settings

The most important information is your blanket's power consumption at different heat settings:

• Check the rating label: Look for a tag sewn into the blanket or on the controller showing power in watts (W)
• Read the manual: Manufacturer documentation usually lists power consumption at each heat setting
• Check the controller: Some controllers display or list power consumption information
• Manufacturer website: Look up your blanket model's specifications online

Track Your Actual Usage Patterns

Once you know the power rating, track your actual usage to calculate realistic seasonal costs:

• Note typical usage: Which heat setting do you normally use?
• Track hours per night: How long is the blanket typically on each night?
• Calculate seasonal usage: Which months do you use the blanket most heavily?
• Estimate days per week: Do you use it every night, or only 4–5 nights?

Using your blanket's power rating and your actual usage patterns produces a more realistic annual cost estimate than assuming year-round daily use.

Electric Blanket Electricity Cost FAQs

How much electricity does an electric blanket use?

Electric blankets vary in power consumption depending on their size, model and heat setting. A reference range of 60–200 watts is provided in this guide, but your blanket may differ. Check the rating label, controller or manufacturer's documentation for your specific model. The 100W example used elsewhere on this page is hypothetical.

Is an electric blanket cheaper to run than a space heater?

The electricity cost depends on the power rating and operating time of each appliance. An electric blanket is designed for direct personal heating, while a space heater heats the surrounding room. To compare their costs, enter the actual wattage and usage time for each appliance into the calculator.

How much does an electric blanket cost to run per month in winter?

This depends on your blanket's wattage, heat setting, and nightly usage. Using the hypothetical example in this guide (100W, 8 hours per night, R3.50/kWh), a month of winter use costs about R85.23. Your actual cost depends on your blanket's power rating and your usage patterns.

Do electric blankets use electricity all night?

Not necessarily. Blankets with thermostat control may cycle the heating element on and off to maintain the selected temperature. The way this operates varies by model, so check your blanket's manual for information about its temperature-control system.

Does using high heat setting on a blanket cost a lot more?

Higher heat settings may use more electricity than lower settings, but the difference varies by blanket model. Check your blanket's documentation for the power consumption at each heat setting.

Is it safe to use an electric blanket every night?

Electric blankets should be used according to the manufacturer's instructions. Safety guidance includes not folding the blanket while in use, checking for damage before use, keeping it away from water, and following the manufacturer's instructions for cleaning, storage and replacement. Always follow the specific safety guidance supplied with your blanket.

How can I calculate the electricity cost of my blanket?

Use this basic formula:

(Power in kW × Hours per night × Days per week × Tariff rate) = Weekly Cost

Or use the What Does It Cost? calculator: enter your blanket's power rating, nightly usage hours, days per week, and your electricity tariff to get a personalised estimate.

Where can I find my electricity tariff?

Your electricity tariff (rate per kWh) is listed on your monthly electricity bill. Look for the cost per kWh or unit charge. If your municipality uses tiered pricing, you'll see multiple rates. Learn more about how electricity tariffs work in South Africa.

Calculate Your Electric Blanket's Electricity Cost

Use the What Does It Cost? calculator to estimate your blanket's actual monthly and yearly electricity costs based on your specific blanket's power rating and your South African electricity tariff.

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