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The consumer champion’s newly-launched running cost tools aim to help people save money on their bills by calculating the energy efficiency of tumble dryer, washing machine, fridge freezer, oven and dishwasher models Which? has tested against the energy price cap.

The least efficient models in each category would collectively cost an eye-watering £490 a year to run. Consumers could save £336 annually by opting for the most energy-efficient appliances – which cost just £154 a year to run.

Which? energy cost data comes from independent lab testing and is based on real-world scenarios. It often reveals big differences between A-rated machines, and that in some cases B and C-rated machines can actually cost less to run.

While some of the most efficient appliances may be more expensive up front, Which?’s research has found they are cheaper over the average product’s lifetime due to their lower running costs.

For example, the most energy-hungry vented tumble dryer the consumer champion tested, the Hoover HL V10LG-80, costs £260 to buy while the most energy-efficient, the Miele TCB140 WP, costs £800.

However, the Miele tumble dryer costs just £29 a year to run – if drying roughly three loads a week – compared to £135 for the Hoover model. Factoring in the cost of both tumble dryers, consumers would save £1,580 over the course of the appliances’ lifetimes if they opted for the Miele machine due to its lower running costs.

Heat pump tumble dryers tend to be both more energy efficient and pricier than cheaper condenser and vented models but can easily pay for themselves in energy savings. On average, condenser dryers cost £109 per year to run whilst heat pump models cost just £42.

Consumers also stand to make big savings by choosing carefully when they buy their next fridge freezer. The least energy-efficient fridge freezer tested, the Hotpoint FFU3DX1, costs £134 in energy bills a year. People could cut this cost by £104 by using the LG GBB92MCBAP, which runs up just £30 in annual energy bills.

The type of fridge freezer people opt for will also have an impact. On average, a freestanding fridge freezer will add around £61 per year to people’s energy bills, while a large American-style fridge freezer will add around £92 per year.

Consumers could also save £55 a year by choosing a more energy efficient washing machine when they need to replace their existing model. On average, a washing machine will add £46 per year to people’s bills, but running costs can vary from under £20 to as much as £70 per year if running four 40°C washes per week.

The most efficient washing machine model tested was the Ebac AWM74D2H, which costs just £15 a year to run, while the least efficient model, the Haier HW100-B14876 costs £70 annually.

However, washing machines which use more energy tend to wash better. Which?’s Eco Buy reviews highlight the products which are long lasting, energy and water efficient and easily repairable while still doing their job well. People should check Eco Buy reviews before purchasing new appliances to make sure the appliance they choose is also high performing.

Ovens are not typically as energy-hungry as other large appliances such as fridge freezers or tumble dryers, but it is still worth checking out their energy-efficiency before buying. On average a built-in oven costs £53 a year to run.

The least efficient built-in oven the consumer champion tested was the Smeg Dolce Stil Novo SFP6604WTPNR – costing £73 to run a year if used for about five hours per week at 170°C. Consumers could save £39 a year by opting for the most efficient oven tested, the Beko BXIF35300X – with just £34 of annual running costs.

The least efficient dishwasher Which? tested, the Candy CYF 6F52LNW-80, would add £78 to people’s annual energy bill if running five washes per week. However, the most efficient full size, the Bosch SMV68ND00G, costs just £46 to run a year – resulting in an annual saving of £32. On average a full-size dishwasher costs £63 a year to run.

Which? is advising consumers who are looking to cut their energy bills to use its running cost tools to check the efficiency of appliances before purchasing new white goods.

While many white goods already come with an energy efficiency rating, Which?’s surveys have found that UK consumers use appliances differently from the official rating tests. For example, the ratings for washing machines are mostly based on washing at 60°C, but most people wash at 40°C.

The consumer champion’s running cost tools calculate the energy efficiency of appliances based on how consumers have told Which? they use their white goods. However, as the tool only looks at the energy efficiency of appliances, people should also check Which?’s Eco Buy reviews to ensure the appliance they choose is high performance and offers the best possible value for money.

Lisa Barber, Which? Home Products and Services Editor, said:

“Choosing the right appliances for your home could cut hundreds of pounds a year from your energy bills and reduce your environmental impact.

“This is crucial at a time when most of us are already facing higher energy bills and having to tighten the purse strings.