Showering vs Bathing: Which Uses Less Energy and Water?
A standard eight-minute shower uses 40 to 60 litres of hot water, while an average bath uses around 80 litres. On the surface, showering wins. But the answer is not always that clear-cut – a power shower or a long shower can actually use more water and energy than running a bath. For Lancashire households paying around £1,200 to £1,600 per year on gas and electricity, understanding the real difference could help trim your bills by £100 to £200 annually.
The Real Numbers: How Much Water and Energy Each Uses
Water flow rates vary enormously between different shower types, and this is where most people get caught out. Here are the typical figures for the most common setups found in Lancashire homes:
An electric shower (the most common type in Lancashire, fitted in around 60% of homes) delivers 5 to 7 litres per minute. An eight-minute shower uses 40 to 56 litres of water. At current energy prices, that costs approximately 25p to 40p per shower, depending on whether you are on a standard tariff or have a smart meter deal.
A mixer shower fed from a combi boiler (increasingly common in renovated terraces across Blackburn, Burnley and Bolton) delivers 8 to 12 litres per minute. The same eight-minute shower now uses 64 to 96 litres – potentially more than a bath. The energy cost is roughly 30p to 50p because the gas boiler heats the water.
A power shower with a pump delivers 12 to 18 litres per minute. Eight minutes under a power shower uses 96 to 144 litres, which is significantly more than a bath. The cost? Around 50p to 80p per shower, plus the electricity to run the pump.
A standard bath uses about 80 litres of hot water from your boiler, costing approximately 30p to 45p. So if your shower runs above 10 litres per minute, a bath might actually be the more economical choice.
Why Shower Duration Matters More Than You Think
independent energy organisations recommends four-minute showers for maximum water and energy savings. But research consistently shows that the average UK shower lasts eight minutes, with many people showering for 10 to 15 minutes. Teenagers are the worst offenders – surveys suggest the average 16 to 24 year-old showers for 11 minutes.
For a Lancashire family of four, each member taking a daily eight-minute mixer shower uses roughly 280 litres of hot water per day just for showering. Over a year, that is more than 100,000 litres and costs approximately £500 to £700 in energy. Cutting each shower by just two minutes would save around 70 litres per day and roughly £120 to £170 per year.
Timing your showers is the single most effective thing you can do. Set a timer on your phone, use a waterproof shower timer (available for £3 to £5), or create a four-minute shower playlist. It sounds simple because it is – and the savings are real.
The Hidden Energy Cost: Heating Water in Lancashire Homes
Around 20% of a typical Lancashire household’s energy bill goes on heating water. The method you use to heat that water affects the cost significantly. A gas combi boiler, which heats water on demand, is currently the cheapest way to heat shower and bath water for most homes in the region. Gas costs around 6p per kWh compared to electricity at around 24.5p per kWh.
Electric showers heat water at the point of use, which means they only heat what you need. But because electricity costs four times as much as gas per unit, the running cost is higher per litre of hot water produced. The advantage of electric showers is that they do not rely on your boiler or hot water tank, making them independent and always available.
If you have an older hot water cylinder system – still common in many pre-1990s homes across the Fylde coast, Lancaster and rural Lancashire – baths can be particularly expensive because you are heating a full tank of water even if you only use some of it. Fitting a cylinder thermostat (set to 60C) and a timer to heat water only when needed can save an estimated £50 to £80 per year.
Practical Tips to Reduce Hot Water Costs
Regardless of whether you prefer showers or baths, there are straightforward ways to reduce your hot water energy consumption without sacrificing comfort.
Fit a water-efficient showerhead. These cost £10 to £30 and reduce flow rate to 6 to 8 litres per minute without noticeably affecting pressure. For a family of four, this single change can save an estimated £80 to £150 per year. They work with mixer showers and are simple to fit yourself – just unscrew the old head and screw on the new one. They are not compatible with electric showers, which already control their own flow rate.
Consider your shower temperature. Turning the temperature down by just 1 or 2 degrees is barely noticeable but reduces the energy needed to heat the water. Most people shower at 38 to 42 degrees Celsius – dropping from 42 to 40 degrees can save 5% to 10% on your water heating costs.
If you regularly bath small children, you do not need a full bath. Running 20 to 30 litres of water is plenty for a young child, costing around 10p to 15p compared to 30p to 45p for a full bath. Bathing two children together also halves the per-person water and energy cost.
What About Lancashire’s Water Costs?
Lancashire is served by United Utilities, and if you are on a water meter, reducing your water usage saves money twice – once on the water itself and again on the energy to heat it. United Utilities charges approximately £2.80 per cubic metre (1,000 litres) for water supply and a similar amount for sewerage. So 80 litres of bath water costs about 45p in water charges alone, before you account for the energy to heat it.
If you are not on a water meter but live in a smaller property – perhaps a one or two-bedroom flat in central Preston, Lancaster or Blackpool – switching to a metered supply could save money, especially if you are a low-water user. United Utilities offers a free meter installation and lets you switch back within 12 months if it does not work out in your favour.
For households on a meter, the combined cost of energy and water makes the shower-versus-bath calculation even more compelling. A four-minute efficient shower might cost 25p in total (energy plus water), while a full bath costs 60p to 75p. Over a year, choosing shorter showers over daily baths saves a single person around £130 to £180.
The Environmental Angle
Beyond the cost savings, reducing hot water consumption lowers your carbon footprint. Heating water with a gas boiler produces approximately 0.2kg of CO2 per kWh. For a family of four switching from daily baths to efficient four-minute showers, the annual carbon saving is around 400 to 600kg of CO2 – equivalent to driving roughly 1,500 to 2,000 miles in a petrol car.
Water treatment and supply also has an energy cost. United Utilities processes billions of litres annually at treatment works across Lancashire, from Rivington to the Pennines. Reducing household water demand eases pressure on these systems and helps conserve Lancashire’s water resources, particularly during drier summer months when reservoir levels can drop below comfortable margins.
The Verdict: Shower or Bath?
For most Lancashire households, a four to six-minute shower with an efficient showerhead is the cheapest and most environmentally friendly option. It uses around 30 to 48 litres of water and costs 20p to 35p in energy and water combined. A bath costs roughly double that at 60p to 80p all in.
However, if you have a power shower and tend to linger for 10 minutes or more, you may as well run a bath – you will use less water. And if you are on a night-rate electricity tariff with a hot water cylinder, heating your tank overnight and bathing in the morning can be cheaper than running an electric shower at peak rate.
The best approach is knowing your specific setup and adjusting accordingly. A plug-in energy monitor on your shower circuit and a simple flow-rate test (time how long it takes to fill a one-litre jug) will tell you everything you need to know about your particular situation.
Is a bath cheaper than a shower?
In most cases, no. A standard shower uses 40 to 60 litres of water while a bath uses about 80 litres. However, power showers delivering 12 litres or more per minute can exceed bath water usage in under seven minutes. Check your shower’s flow rate to determine which is cheaper in your specific situation.
How much does a shower cost in Lancashire?
An eight-minute electric shower costs 25p to 40p. A mixer shower from a combi boiler costs 30p to 50p. A power shower costs 50p to 80p. The exact cost depends on your energy tariff, water temperature and flow rate. Adding metered water costs increases each figure by approximately 10p to 15p.
What is the cheapest way to heat shower water?
A gas combi boiler is currently the cheapest way to heat shower water for most Lancashire homes, because gas costs about 6p per kWh compared to 24.5p for electricity. If you have solar panels or a heat pump, these can reduce the cost further. Heating water in an immersion heater overnight on an Economy 7 tariff is another cost-effective option at around 10p per kWh.
