Slow cookers have become a kitchen essential for many households. Their ability to simmer delicious meals while using minimal energy makes them not only convenient but also cost-effective. However, with the rising cost of energy in the UK, many people are wondering just how cheap slow cookers really are to run. Is it more economical to slow-cook a meal over several hours, or would an oven, microwave, or air fryer be cheaper?
This blog provides a breakdown of the costs involved in running a slow cooker, factors that affect their energy consumption, and comparisons with other appliances. We’ll also share some tips to get the most out of this handy kitchen tool. By the end, you’ll know why slow cooking is an energy-efficient cooking solution.
Factors Affecting Slow Cooker Energy Consumption
Factors Affecting Slow Cooker Energy ConsumptionBefore we calculate the cost of using a slow cooker for eight hours, it’s important to understand the key factors that impact energy consumption. These include the wattage of your slow cooker, the duration of use, and the energy efficiency of the model.
Wattage
Most slow cookers in the UK have a wattage range of 120 to 300 watts for low settings and 250 to 500 watts for high settings. For example, if your slow cooker operates at 200 watts (0.2 kW) for eight hours, it will consume 1.6 kWh of energy. Higher wattage models will consume more power, but usually not by a significant amount.
Cooking Time
Naturally, the longer your slow cooker runs, the higher the energy consumption. However, even over extended cooking times, their energy use remains relatively low due to their efficient design and low wattage.
Model Efficiency
Older slow cookers or those with outdated heating technology may consume slightly more energy than modern, energy-efficient designs. Be sure to check energy ratings or reviews when purchasing a slow cooker to ensure optimal cost savings.
Insulation and Lid
The quality of insulation and the lid’s ability to trap heat also play a significant role in energy consumption. A poorly fitted lid allows heat to escape, forcing the slow cooker to work harder to maintain the desired temperature.
How to Calculate the Cost of Running a Slow Cooker for 8 Hours
To calculate the cost, you’ll need to know the wattage of your slow cooker and the unit cost of electricity from your provider. Here’s a step-by-step guide:
- Find your slow cooker’s wattage. For example, let’s assume 200 watts (0.2 kW).
- Multiply the wattage by the number of hours you’ll use it. For eight hours, this would be:
- 0.2 kW × 8 hours = 1.6 kWh
- Check your electricity tariff to determine the cost per kWh. The average UK electricity price is approximately 30p per kWh (as of 2024).
- Multiply the kWh by the cost of electricity
- 1.6 kWh × 30p = 48p
It costs around 48p to run a slow cooker for eight hours on average. Some low-wattage slow cookers may cost even less, while higher-wattage models may slightly increase this figure.
Comparison with Other Appliances
To truly understand the cost efficiency of slow cookers, it’s helpful to compare their energy consumption with other common kitchen appliances.
Oven
Ovens typically consume between 2,000 and 2,400 watts (2 to 2.4 kW). Running an oven for just one hour would cost:
- 2.4 kW × 1 hour × 30p = 72p
If you use an oven for two hours to cook a meal, the cost doubles to £1.44, significantly higher than using a slow cooker.
Microwave
Microwaves generally operate at around 700 to 1,000 watts. They are energy-efficient because they cook food quickly, but they’re not ideal for slow cooking. For example, running a microwave for 15 minutes costs:
- 0.7 kW × 0.25 hours × 30p = 5.25p
While the cost per use is low, microwaves aren’t suitable for all types of recipes.
Air Fryer
Air fryers use approximately 1,000 watts (1 kW) of power. Cooking with an air fryer for an hour costs:
- 1 kW × 1 hour × 30p = 30p
While air fryers are energy-efficient over short durations, they may not be suitable for meals requiring extended cooking times.
Gas Hob
Gas hobs are priced differently as they rely on gas costs rather than electricity. On average, running a gas hob for one hour costs around 17p. However, gas hobs are less energy-efficient and are not ideal for slow cooking meals over long durations.
Quick Comparison Chart
|
Appliance |
Cost for 8 Hours |
Suitable for Slow Cooking? |
|---|---|---|
|
Slow Cooker |
48p |
Yes |
|
Oven |
£1.44 |
Yes, but expensive |
|
Microwave |
~42p (for ~2 hrs total use) |
No |
|
Air Fryer |
£2.40 |
No |
|
Gas Hob |
£1.36 |
Yes, but less efficient |
Tips for Maximising Slow Cooker Efficiency
To make your slow cooker even more energy-efficient, consider the following tips:
- Batch Cooking: Cook larger portions and store leftovers. Reheating small portions uses less energy than cooking multiple smaller meals.
- Preheat When Necessary: Preheat your slow cooker only if the recipe requires it. Otherwise, it’s not necessary.
- Avoid Lifting the Lid: Each time you open the lid, heat escapes, and the cooker uses more energy to compensate. Use glass lids to monitor progress without removing them.
- Use the Right Size: Choose a slow cooker size appropriate to your meal. Smaller slow cookers require less energy.
- Use Low Settings: Unless time is a constraint, use the low heat setting, which is more energy-efficient than high settings.
Why Slow Cookers are Cost Effective
Slow cookers are one of the most energy-efficient appliances in the kitchen. At just 48p for 8 hours of use, they provide great value compared to ovens or other methods of cooking. Plus, their ability to cook meals unattended makes them convenient for busy households.
Whether you’re simmering stews, soups, or even desserts, these appliances offer an unbeatable combination of affordability and ease of use.