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Cost-efficient Cooking

publication date: Sep 20, 2022

With energy bills rising to a cap of £2,500 per year on 1 October, many people are looking for ways to save money on gas and electricity and cooking energy efficiently will definitely save the pennies. With this in mind, the team at Hometree have revealed the costs of running your cooking appliances, by looking at which ones use the least amount of energy.   

It's possible to estimate how much energy each appliance uses by multiplying its power rating in kW by the number of minutes/hours it’s left on. Wattage information should be on the label or in any manual that comes with your appliance.

Slow Cooker – 5p per hour

Slow cookers are making a comeback – and with good reason, in terms of appliances, it's one of the most energy-efficient ways to cook.  

Even if you have it on all day, slowly braising a beef casserole, it will use about the same amount of energy as a lightbulb, cutting your energy consumption and saving you some money in the process.

Slow cookers have low wattage, so even cooking something for eight hours will use less energy than an oven or hob. On average, slow cookers usually use about 1.2kW over the course of eight hours, which means it will only use around 162.5w per hour, which works out at just five pence per hour. 

Microwaves - 1.98p every five minutes

Microwaves aren’t as versatile as conventional ovens, but for certain tasks, a microwave can be very useful. Reheating is a good example, as is defrosting, melting butter or chocolate or softening onions.  

Baked potatoes are also best started off in the microwave before being crisping up in the oven – or indeed finished in the microwave if you don’t mind a softer skin. As they can cook or heat food more quickly, microwave ovens use up to 80 per cent less energy than conventional ovens.  

On an average 700w microwave, the appliance will use about 0.058kWh of energy if used for around five minutes. This will cost around 1.98p when used for five minutes. 

Air Fryers – 5p every ten minutes

Air fryers are much more energy-efficient than most convection ovens because they cook food much faster, though they do use electricity, which is typically more expensive than gas. Recent research has shown that cooking in an air fryer costs about half the price of cooking in an oven.  

An air fryer is similar to an oven in the sense that it bakes and roasts. Still, the main difference is that the heating elements are only located on the top and are accompanied by a large, powerful fan.   

The average air fryer wattage is 1kW, meaning that using an air fryer for around ten minutes would use up to around 0.16kWh of energy. This will cost around five pence on average.  

Hobs (Gas/Electric/Induction) - 17p every 15 minutes

An induction hob uses energy more efficiently than a gas or electric ceramic hob regardless of whether you’re gently heating up soup, simmering chickpeas for hours, or bringing pasta to a boil. This is because no energy is wasted heating the space around the pan.   

Electric hobs are your next best bet in terms of efficiency because when you’re cooking with gas, a significant amount of heat is lost to heating up your kitchen, rather than your food.

However, electricity is more expensive than gas, so a gas hob may save you a few pounds a year.   

The average wattage of an electric hob is 2kW, meaning an electric hob runs at around 0.5kWh if it’s on for 15 minutes. This will cost about 17 pence per use.   

Ovens (Gas/Electric) – 34p every 20 minutes

The same applies to ovens and hobs: gas is cheaper than electricity, but electricity is more efficient. In either case, if you’re reheating food, the Energy Saving Trust recommends using a microwave, particularly if it has a good energy rating.  

Using your oven every day can be a real drain on power, and finances. But if you do have to use an oven, there are ways to maximise your energy efficiency. For example, refrain from storing baking trays inside the oven when cooking, as they block the airflow. Also, cleaning your oven regularly helps maintain more effective heat distribution.  

The average wattage of an oven is around 3kW, meaning it uses around 1kwh if run for around 20 minutes, which is about 34 pence.