The Real Cost of Running a Slow Cooker in Your Home
With energy bills still biting hard across the UK, most households are scrutinising every appliance they own. The kettle. The oven. Even the humble toaster. But one appliance keeps coming up in kitchen conversations, and it might surprise you. The slow cooker. Spend eight hours simmering a beef stew, and you'd be forgiven for assuming the electricity bill has taken a hit. But do slow cookers use a lot of electricity? The short answer is no, and the numbers back it up. This guide breaks down exact wattage figures, real-money running costs based on current UK energy tariffs, and practical strategies to keep your kitchen bills as low as possible.
Do Slow Cookers Use a Lot of Electricity Compared to Ovens?
Here's where most people get it wrong. Runtime and energy consumption are not the same thing. A slow cooker running for eight hours does not automatically cost more than an oven running for one. What actually matters is wattage, and this is where the countertop appliance pulls well ahead.
A standard electric slow cooker works by trapping heat through heavily insulated ceramic walls. Once the temperature reaches a set point, the element burns much less and instead cycles on and off to maintain that temperature. Compare this to a conventional oven, which has to keep up with constant heat loss every time hot air escapes, and the distinction becomes very clear.
The result? An eight-hour slow cooker session often consumes less electricity than a single 30-minute oven cycle.
Decoding the Wattage of an Electric Slow Cooker
A slow cooker is a low-wattage appliance. Here's how the numbers stack up by model size:
Small (1.5–2.5 litre): 120W–150W
Medium (3.5–4.5 litre): 160W–200W
Large (5.5–7 litre): 200W–300W
Now contrast that with other kitchen appliances:
Electric kettle: 3,000W
Traditional electric oven: 2,000W–3,000W
Microwave: 600W–1,200W
Electric hob (single ring): 1,500W–2,000W
Does slow cooker take a lot of electricity? Not in the slightest! Slow cookers draw way less power than traditional stovetops and ovens. Even a large slow cooker of a 300W unit uses a tenth of what a kettle demands.
Slow Cooker vs. Traditional Electric Ovens
Let's put that into practical terms! You have a 1.5 kg pork shoulder. The first option is to roast it in a traditional oven, set at 180° C, for about 1.5 hours. The second option, cook it in a slow cooker for 6 hours.
A standard 2,500W oven running for 1.5 hours uses 3.75 kWh. A 200W slow cooker running for 6 hours uses just 1.2 kWh. That's a 68% reduction in energy use for the same cut of meat, and often better results.
The fundamental problem with large ovens is dead-air volume. You're heating a cavity of several hundred litres, most of which contains nothing but air. That's wasted energy on a significant scale, every single time you cook.
Exactly How Much Electricity Does a Slow Cooker Consume?
How much electric does slow cooker use is best answered using the kilowatt-hour (kWh), the standard unit of measurement you'll find on every UK energy bill. One kWh equals 1,000 watts running for one hour. It's the universal metric that energy suppliers use to calculate your usage and what you owe.
To get a handle on how much electricity does a slow cooker consume across a typical cook, you need two figures: the wattage of your model and how long you're running it.
Calculating How Much Electric a Slow Cooker Uses Per Hour
The calculations are straightforward with the formula below:
Wattage × Hours ÷ 1,000 = kWh consumed
Using a typical 200W medium model as the baseline:
Cooking Duration | kWh Consumed |
4 hours | 0.8 kWh |
6 hours | 1.2 kWh |
8 hours | 1.6 kWh |
10 hours | 2.0 kWh |
How much electricity does a slow cooker use to make a standard dinner? For an 8-hour cook, using a 200W slow cooker, expect about 1.6 kWh. That is your baseline for all other examples.
Low Setting vs. High Setting Energy Impacts
It is a common misconception that the High setting is more expensive. While it seems reasonable, the assumption is inaccurate.
The key distinction is speed, not efficiency. The High setting brings the appliance to its maximum temperature (around 90°C–95°C) quicker than the Low setting. The Low setting is slower, but the end temperature is the same. After reaching the desired temperature, the cycling of the element is the same for both settings.
The difference in energy consumption of a 6-hour cook on the Low setting vs. a 3-hour cook on the High setting wastes about 0.3 kWh. It is worthwhile to consider both the Low and High settings for energy, but the difference in time is what matters.
How Much Does a Slow Cooker Cost to Run in the UK?
All of this means very little until you translate it into pounds and pence. How much does a slow cooker cost to run on a typical day? Based on the current UK energy price cap, the average unit rate sits at approximately 24.67p per kWh (though this varies by tariff and region, always check your own bill).
Note: The current Ofgem electricity price cap is 24.67p/kWh. This figure is not fixed but changes every quarter. Always visit the Ofgem official website for the up-to-date price cap.
Daily and Weekly Cost Breakdown Based on UK Energy Tariffs
Using 24.67p per kWh as the working rate:
Scenario | kWh Used | Approximate Cost |
4-hour cook (200W) | 0.8 kWh | 19.7p |
8-hour cook (200W) | 1.6 kWh | 39.5p |
3 cooks per week | 4.8 kWh | £1.18 |
4 cooks per week | 6.4 kWh | £1.58 |
Does a slow cooker use a lot of electricity? At under 40p for a full eight-hour family meal, absolutely not. For a household using it four times a week, you're looking at roughly £6.84 per month in total cooking electricity costs. Compare that to using an oven for the same number of meals, which could easily cost three to four times as much.
Note: The current Ofgem electricity price cap is 24.67p/kWh. This figure is not fixed but changes every quarter. Always visit the Ofgem official website for the up-to-date price cap.
Hidden Factors That Influence Your Kitchen Energy Bills
A few variables can push your costs higher than these baseline figures suggest:
Lifting the lid: Every time you remove the lid, the internal temperature drops by roughly 10°C–15°C. The appliance then has to work harder to recover, adding unnecessary time and energy to your cook. Resist the urge.
Room Temperature: If the Slow Cooker is in a Cold Utility Room or unheated areas of the house during the Winter, the element will work a little harder to maintain the temperature. It is not a big difference, but it is worth accounting for.
Appliance age and insulation quality: Older models that have had the seals worn will be less effective in retaining heat. A new energy-efficient slow cooker may pay for itself over time if your current one is over 10+ years old.
Peak-hour cooking: This one matters more than most people realise. If you're on a time-of-use tariff (such as Octopus Go or Economy 7), electricity between 4 PM and 7 PM can cost significantly more than overnight or early-morning rates. Scheduling your slow cooker to finish its cycle before 4 PM or starting it overnight avoids this penalty entirely.
Future-Proofing Your Kitchen Against Volatile Energy Costs
When and where you use electricity often matters more than the appliance itself. Under time of use tariffs, power can cost nearly twice as much during the 6 PM evening rush compared to 2 AM. A home battery system lets you bypass these peak rates entirely by charging up when electricity is at its cheapest and discharging when you need it most. It effectively lets you cook dinner at peak times while paying off-peak prices.
Securing Off-Peak Rates with the EcoFlow STREAM 5000 Home Battery
For households that run a slow cooker and other kitchen appliances without solar panels, the EcoFlow STREAM 5000 provides an affordable home energy storage solution. It can be configured to charge from the grid during low-cost overnight periods and discharge stored energy during expensive peak evening hours. With a powerful 3,000W off-grid AC output and 800–3,000W grid-connected AC output, it can reliably power a wide range of household appliances while helping reduce electricity costs. The compact Plug & Play+ design allows the STREAM 5000 to be conveniently installed in a garage, utility room, or cupboard, providing a streamlined and space-efficient way to manage household energy consumption.
Maximising Free Solar Generation via the EcoFlow STREAM 5000 AC Storage System
For households that already have a solar array on the roof, the issue is not generating energy; it is how to store it. Most households have to export the majority of solar energy to the grid during the day and then buy it back at full cost in the evening when they are cooking. EcoFlow STREAM 5000 AC addresses this problem directly. With its 100% compatibility and effortless integration with your current configuration, this AC-coupled battery eliminates the need for significant system overhauls. Its approximately 5.24 kWh energy storage capacity effectively collects and stores excess solar energy throughout the day, allowing households to use clean, stored solar power for evening cooking and other household energy needs.
Conclusion
Switching to a slow cooker for family meals will save you money on kitchen electricity. They require much less electricity than standard ovens. It draws a fraction of the wattage of conventional ovens, costs less than 40p for a full eight-hour cook, and, when used strategically. They save a decent amount year-round. Use them during off-peak hours and keep the lid on. Your savings grow. Use the right appliance, know the time it is being used, and manage where your electricity is coming from.
At EcoFlow, we build energy solutions designed for exactly this kind of household: people who want control over their bills without complexity. Whether you're looking to store cheap off-peak grid electricity or make the most of an existing solar setup, the STREAM 5000 range gives you a reliable, expandable foundation to do it. Explore our full range of the best solar battery storage systems and start taking back control of your electricity costs today.
Slow Cooker Frequently Asked Questions
Can I safely leave my slow cooker running all day while I am at work?
Yes, slow cookers are designed to run unsupervised for extended periods of time. It is completely safe to leave running while you are away because of the heavy-duty casing and internal thermostat safety switches that keep a steady, safe temperature well below the boiling point.
Is it cheaper to use a slow cooker or a microwave for family meals?
A microwave's short duration makes it quicker and consumes less energy overall for little servings or fast reheating. However, a slow cooker is significantly more cost-effective than reproducing such results in a traditional oven or on the hob for large family meals, stews or difficult meat cuts needing deep heat penetration.
Does filling a slow cooker to the top use more electricity?
Energy consumption remains virtually identical regardless of how full the ceramic pot is; the element outputs a fixed wattage. That said, an overfilled unit takes longer to reach operating temperature, which can marginally extend your total cook time. Always follow the manufacturer's recommended fill lines for best efficiency.