Four Ways to Reduce Your Household Energy Use – Proven by Research

Article | Aurore Julien, Lecturer in Environment, Energy and Resources, UCL

A particularly cold September has given us a glimpse of the winter to come. The cold will bite hardest for the 13% [1] of England’s households that are already in fuel poverty. As the energy crisis intensifies, this is expected to rise further.

European leaders have therefore rushed to implement measures to protect households. The UK’s Energy Price Guarantee [2] caps the

unit price of electricity and gas at 34p and 10p respectively. While this will ease some concerns over rising energy bills, many households will still be priced out of warming their home in the coming months.

So here are four ways research indicates households can reduce their energy use in time for the winter – and save money in the process.

Many households are already feeling the effects of rising energy prices.

1. Air Dry Laundry

Washing and drying clothing is responsible for around 12% [3] of household electricity use in the UK. Hand washing is frequently suggested as an energy-saving alternative to machine washing.

Yet modern washing machines are highly efficient, typically using 0.5 kilowatt hours [4] for a 9 kg wash. This is considerably less than the 0.82 kilowatt hours [5] used on average by hand washing. Even inefficient washing machines tend to use less energy than hand washing as much less hot water is required.

By instead restricting use of the tumble dryer, greater reductions in energy use can be achieved. Tumble dryers use a lot of energy [6] with a single cycle using up to 4.5 kilowatt hours. This will cost £1.50 per cycle at the price cap.

By air drying laundry instead, I calculated that the average household could save over £130 a year.

2. Use Less Hot Water

Facing critical gas shortages, the German city of Hanover turned off the hot water [7] in the bathrooms of all public buildings earlier this year.

While energy-saving measures this severe are unlikely, hot water production in the UK is a major consumer of energy, accounting for roughly one quarter [8] of household energy use. There are several ways households can reduce their hot water use.

One way is reducing the time spent in the shower. A high-pressure shower lasting nine minutes uses around 4.3 kilowatt hours [9] of gas. At the price cap, this will cost households 44p per shower. By reducing the time spent showering to six minutes, households can save 15p on heating water for each shower.

If you have a hot water tank, making sure it is well insulated can also deliver cost savings. This will keep water warmer for longer and reduce heating costs.

Another approach is to install a low-flow shower head. This restricts the flow of water while maintaining the feel of a high-pressure shower. At lower flow rates, a shower will consume less hot water.

For households that average two nine-minute showers a day, this could save over £100 per year.

However, a low-flow shower head will only work well in areas where the water pressure is already sufficiently high.

Reducing the flow of an already lowpressure shower would transform the shower into a dribble.

Hand washing laundry is often touted as an energy saving alternative to machine washing.

3. Make Better Use of Heating

As the energy crisis intensifies, it is important to make sure heating is not wasted unnecessarily. Research [10] indicates that energy use could be slashed by up to 30% by reducing heating when occupants are asleep or away.

This can be done by manually dialling down the thermostat or by turning the heating off altogether. For those who habitually forget to lower the heating, a smart thermostat could prove a useful investment.

These can be controlled remotely via your mobile, or automatically through presence sensors and allow heating to be lowered when the home is unoccupied.

Energy is also wasted by heating unused rooms. Thermostatic radiator valves are one way to control the temperature across different rooms. They regulate the flow of hot water through radiators and can be programmed to modulate the temperature for each room. [11]

Thermostatic radiator valves can deliver substantial energy savings. One study found that they result in 10%–18% [12] less energy use compared to homes with no heating controls. However, it is important that the doors between rooms remain closed to prevent energy being wasted.

4. Maximise Insulation

Although we can make better use of heating, Britain’s homes are hugely energy inefficient. Its housing stock is one of the least insulated [13] in Europe.

Maximising your insulation is one way to reduce your energy use. Secondary glazing in the form of window shutters can halve [14] the amount of heat lost through a single glazed window. I calculated that this could save the average UK home over £50 per year in heating costs.

But window shutters do not always represent an immediate energy-saving strategy. Shutter installation can be costly and if installed on a building’s exterior may require planning permission.

Closing blinds or curtains at night and during cold spells instead represents a cheaper way of retaining heat. Research indicates that blinds can reduce the amount of heat lost through windows by up to 38%. [15]

Changes in habits and small investments can substantially reduce energy consumption. If widely implemented, they can ease the energy crisis. [16] While the Energy Price Guarantee will provide temporary relief to many, investment in energy efficiency measures such as insulation must be prioritised to reduce our energy burden longer term.

Homes with heating controls use much less energy than homes without.

The original article can be found at: https://theconversation.com/four-waysto-reduce-your-household-energy-useproven-by-research-191794

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9. Critchley R, United Utilities, Phipps D. 2018. Water and Energy Efficient Showers: Project Report. United Utilities and Liverpool John Moores University, p.5. www.waterwise.org.uk/wp-content/uploads/2018/02/United-Utilities_Water-and-Energy-Efficient-Showers_Project-Report.pdf (Last accessed October 2022)

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13. Committee on Climate Change. (2017). Annex 2. Heat in UK Buildings Today. www.theccc.org.uk/wp-content/uploads/2017/01/Annex-2-Heat-in-UK-Buildings-Today-Committee-on-Climate-Change-October-2016.pdf (Last accessed October 2022)

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15. Shahid H, Naylor D. Energy Performance Assessment of a Window With a Horizontal Venetian Blind. Energ Buildings 2005; 37(8):836–43. https://doi.org/10.1016/j.enbuild.2004.11.008

16. Julien A. (2022). Turning Down Your Thermostat Really Can Ease a Gas Supply Crisis – Here’s How. The Conversation, 10 March. https://theconversation.com/turning-down-your-thermostat-really-can-ease-a-gas-supply-crisis-heres-how-178915 (Last accessed October 2022)