Ground Source Heat Pump

ground source heat pump

Ground Source Heat Pumps – Their Cost, Their Installation and Their Efficiency

Heating accounts for a significant portion of a household’s energy demand and a ground source heat pump system can provide a cost-effective and sustainable way to warm a home. The pump uses a small amount of electricity to transfer naturally occurring heat from the adjacent ground into the house.  As the temperature just a couple of metres below the surface remains more or less constant at 11°C to 12°C, it is possible to design a very efficient heat transfer system.

How does it work?

A sealed loop of fluid-filled pipe is buried in the garden or driveway. The length required depends on the size of the home and the amount of heat required. An average system for a family dwelling will typically require pipework up to 100m long.  Vertically drilled boreholes and deeper pipes can be used in more confined spaces. Once installed, the ground is restored to its original condition and the system becomes invisible.

The ground source heat pump circulates water and antifreeze around this loop. The fluid absorbs heat from the ground before it passes through a heat exchanger.  Energy is then transferred to the heating and hot water circuits of the home. The cooled fluid flows back into the ground loop in a continuous process for as long as the heating is required. Some systems can also be designed to meet cooling needs in summer.

While there are some minor residual energy and carbon costs, hooking the pump up to a home renewable technology such as a solar panel can increase its sustainability credentials even further.

What properties are suitable?

Ground source heat pump systems are not suited to every type of property. In general, they work most efficiently in well insulated homes with a relatively even and low heat demand. They produce heat at a lower temperature than more conventional central heating so a larger area is required for heat distribution. Underfloor heating is the ideal partner, though large heat pump system radiators are available. The system also requires sufficient outside space for installation. While minimal on-going maintenance is required, there can be considerable disruption during installation, and the system tends to be more attractive for new-build or as part of a wider home improvement project.

A typical domestic ground source pump is the size of a large upright fridge freezer. To save indoor space they can be installed in an outbuilding or basement.  They just need to be as close as possible to the end of the ground loop pipe. With a typical noise level of a little over 40dB at one metre away, they are as quiet as a fridge.  That’s considerably quieter than a typical gas or oil central heating boiler.

What do they cost and how much will I save?

Costs and savings will be dependant on the size of the pump, the length and depth of loop installation, the energy efficiency of the property, the sort of heating system that is being replaced and whether any additional work is required on the wider home heating system.  A typical domestic installation costs £12,000 to £15,000, with annual running costs of £600 to £700. At current prices, the payback from a ground source heat pumps is unlikely to represent an attractive alternative to an established mains gas central heating system. However, installers claim energy savings of nearly £1,500 annually for a typical four-bedroom house when compared with standard electric heating, or around £600 when compared to oil-fired central heating. That represents a saving of nearly 5,000kg of CO2 emissions each year.  Government Renewable Heat Incentive grants are currently available for installation.

Their installation will also greatly improve your energy efficiency score on your EPC.

If you liked this article, have a look at some of our other recent posts.

Property Size and Type and its Effect on Energy Usage and Your EPC

European Directives on Building Energy Performance

Top Tips for Selling Your Home

Comparing the Energy Efficiency of Modern and Traditional Walls

Waste Water Heat Recovery Systems (WWHRS) and your EPC

Are Conservatories Energy Inefficient?

Renewable Energy Keeps Getting More Popular

If you’d like to book an EPC for your home, simply contact us by phone or email, or fill in our contact form.

 

Property Size and Type and its Effect on Energy Usage and Your EPC

EPC

Energy usage by property size and type

It’s a simple fact that large old detached houses have a lower EPC score than modern flats.

Logic suggests that, on average, larger properties will generally use more energy for heating than comparable smaller ones. However, there are many variables involved in such a calculation, not least of which will be the type of property. Flats tend to have fewer external walls and roofs than terraced houses, which in turn have fewer than semi-detached or detached houses. The larger the external surfaces, the greater the expected loss of energy. Other variables such as the age of the property, building materials and the effectiveness of energy efficiency measures that have been installed also confuse the picture.

So although there are a lot of things you can do to influence the score of your EPC, some things you can’t.

A large sample of households would be needed to make an analysis of energy need by dwelling type statistically reliable. The Government’s Home Energy Efficiency Database (HEED) provides such a data set. While not freely available to individuals, the information is available to researchers and organisations planning and monitoring progress in home energy efficiency. It includes information collected between 1995 and 2012 on some 13 million dwellings in the UK, almost half of the country’s housing stock. The data includes property age, type, tenure and energy use, and details such as glazing type, wall type, heating systems and energy efficiency measures.  All of which are fundamental to EPC calculations too.

Researchers at the Energy Institute of University College London were given access to the database to undertake a wide range of analyses, including an evaluation of average energy usage by dwelling type and number of bedrooms.  Their research is reported in the journal Energy Policy (Energy efficiency in the British housing stock: Energy demand and the Homes Energy Efficiency Database. Hamilton I.G. et al, Energy Policy 60 (2013) pp 462-480).

The researchers analysed the data to provide an overview of the statistics for gas and electricity use in 2006 by different types and sizes of dwelling. The following tables summarise their findings, giving the median value in each case (i.e. the mid value when all data are set out in increasing order of size), as they showed this to be a more representative ‘average’ than the mean. The figures for gas and Economy 7 tariff electricity are likely to be most representative of energy demand for heating.

Median energy use for different types of property

Type

Normal tariff  Electricity (kWh/yr) median

Economy 7  tariff  Electricity (kWh/yr) median

Gas (kWh/yr) median

Flat

1,967

4,309

10,242

Bungalow

2,784

4,828

16,129

Terraced house

3,038

4,845

14,983

Semi-detached house

3,310

4,765

16,571

Detached house

4,023

5,135

20,992

Median energy use for different numbers of bedrooms

Number of bedrooms

Normal tariff  Electricity (kWh/yr) median

Economy 7  tariff  Electricity (kWh/yr) median

Gas (kWh/yr) median

1

1,934

4,685

11,137

2

2,554

4,662

13,541

3

3,357

4,637

16,590

4

4,358

5,390

21,560

5+

4,890

6,171

24,246

As expected, the results confirm that detached houses and bungalows have the highest energy usage. The figures show a clear decrease in demand as the level of detachment declines, so that flats, with the highest number of party walls and ceilings, show least energy usage.  Something which EPC scores also make clear too.

The median gas demand increases on average by 22% for every additional bedroom over one in any property type. Overall electricity use also generally increases with additional bedrooms, though not as clearly and steeply as gas.

Are Conservatories Energy Inefficient?

conservatory

Do conservatories conserve energy?

How does a conservatory affect your EPC?

While undoubtedly being great for providing additional light-filled living space, the question of whether conservatories are good for energy conservation is less straightforward.   Just how much is your conservatory costing you and could it have a detrimental effect on your EPC?

A conservatory is a popular and relatively cheap way of extending a home. If it has a floor area of less than 30sqm, a door that thermally separates it from the house and it is not connected to the house heating system, a conservatory is also generally exempt from Building Regulations Part L controls, and possibly also planning permission, depending on its position and the history of extensions to the property.

However, all too often the conservatory becomes a very costly addition when on-going heating bills are considered.  The cheapest, aluminium-framed conservatories of the 1970s and 1980s and those with polycarbonate rather than glass roof panels are particularly poor in terms of energy efficiency, and there is very little retrofitting that can be done to make significant improvements.

In the right place, conservatories are great for harvesting heat from the sun, but this can mean they become too hot in the summer while being very inefficient in the short and often cloudy days of winter. A south-east facing conservatory is generally considered best, as it will collect heat from the morning sun and be less prone to overheating during the warmest part of the day.

The positive side of the winter story is that a closed and unheated conservatory may provide a slight buffer to the rest of the house against cold weather, reducing the temperature difference between the main room and the outside by a few degrees. For this to be effective, the conservatory must be thermally separated from the main part of the house with solid, draught-proof doors, or glass doors with thick curtains. Thermal mass in the conservatory will store winter heat for longer, so exposed brick walls that catch the sun and a stone floor will absorb then slowly release the energy.

The downside is that many families need the conservatory as a living space year-round, and soon discover just how inefficient they are at conserving heat.  It is simply not feasible to insulate such an extensively glazed space sufficiently, so the only energy and cost efficient way to run a conservatory is not to heat it.

While a conservatory can never be brought up to the thermal standard of even an un-insulated cavity walled room, for a family that has no option other then to use and heat the conservatory there are measures that can help a little. Modern double-glazing with ‘Four Seasons Glass’, blinds and shutters can all help to reduce the amount of wasted energy.

A more radical solution is to replace the glazed roof with solid, insulated panels. The situation in relation to planning permission and Building Regulations should be checked. Installers claim that modern panels can be up to eight times more efficient than a polycarbonate roof, and some fit ‘multifoil’ insulation which is very efficient at heat deflection in the summer while helping to protect against damp and condensation in the winter. This is said to reduce the hottest summer temperatures in the conservatory by 70% and make it 90% warmer in the winter. While such figures sound impressive, the conservatory will nevertheless still suffer a very significant loss of energy through the winter if heated.

Remember, conservatories that are not thermally separated can have a detrimental impact on your EPC score.

Energy Performance Contracts

EPC

Where now for domestic energy efficiency policy?

While the UK Government concentrates policy effort on developing new, more flexible energy sources, there is an increasing realisation that there is another side to the equation. Perhaps the single most significant measure we could adopt to secure our energy future and to reduce carbon emissions is to make more efficient use of energy by reducing demand and wasting less.

The UK unnecessarily throws away almost a third of the energy it uses. This represents a major cost to consumers and the environment. Implementing further energy efficiency measures would reduce carbon emissions, create jobs and ultimately save more money than it costs. However, at the household level, policy and schemes that have been tried so far have made little impression on the opportunity.

The Government’s Green Deal scheme was scrapped in 2015 after a disappointing take up. While more than 300,000 assessments were undertaken, less than 2,000 resulted in active projects, a conversion rate of less than 1%. The Green Deal was a ‘pay-as-you-save’ scheme with loans made available to pay for energy efficiency measures. These were to be repaid over a period of up to 25 years through electricity bills from the financial savings that resulted. However, the 7% to 10% APR interest rate charged to home owners proved unattractive, unsurprisingly perhaps given that it was several percentage points higher than ordinary bank loans available at the time. 

So where will Government policy guide us next? High cost loans have not worked. While many householders have implemented low cost energy efficiency measures, it seems that incentives may be necessary to persuade them to go further. The goal must be to encourage them down the route of implementing more effective measures such as insulation, renewables and energy efficient heating, but policy tools are needed to deal with the high capital costs and often long return periods.

Maybe there is a clue towards the future direction of policy travel in a glimmer of hope in the public sector, where there is an increasing interest in Energy Performance Contracts (another ‘EPC’).  These formal partnerships between a public body and its energy services company (ESCO) were introduced by The Energy Efficiency (Encouragement, Assessment and Information) Regulations 2014. The contract covers the design and provision of specific energy-saving measures and on-going monitoring. It guarantees that the measures will generate sufficient savings to pay for the project, ensuring a secured financial saving over the period of the agreement. Any savings beyond the end of the contract go to the customer.

While it is early days, one EPC between E.ON and Leeds City Council is tackling energy efficiency in nine public buildings, including schools, leisure centres and data centres. The seven-year contract is projected to achieve a 26% saving in energy costs through a range of measures, such as new lighting, boiler and voltage optimisation, and upgraded building management systems. E.ON is responsible for the up-front investment, and has guaranteed that the savings over the seven years will cover all equipment and installation costs. In addition to being able to fund the repayments from the savings made, Leeds City Council will see reductions in energy costs over the long-term, improved building performance and the project is helping it meet its own environmental aspirations and obligations as a public sector body.

Book an EPC to find out how you can make your home more energy efficient.

Can Switching Save Energy as well as Money?

EPC - Switching

Back in 2006, householders had only ten energy suppliers to choose from, and most bought from one of the ‘big six’, British Gas, EDF Energy, E.ON, npower, ScottishPower or SSE. Today, domestic customers have a choice of more than 40 suppliers, but the big six still supply well over 90% of British households with gas and electricity.

Despite advertising campaigns by the new entrants and price comparison websites, many people still believe that switching supplier is a daunting process. In reality, market reforms by Ofgem to create a more level playing field for small suppliers have made the process quite straightforward.

Customers can research and handle the changeover themselves with the assistance of their newly chosen supplier, or they can use one of Ofgem’s accredited energy comparison websites such as uSwitch, Moneysupermarket or Simply Switch. The full list is available here.

Ofgem suggests that switching can bring annual savings of around £300, according to its latest research. Of course, householders may also want to take the quality of customer service provided by the suppliers into account when choosing, and Ofgem can also help with customer complaint performance results (here).

Smaller suppliers are gradually gaining a presence, making the market more competitive. At the moment, the majority of them have fewer than 250,000 customers, but names like Ecotricity, OVO Energy, First Utility, Bulb, Octopus Energy, Robin Hood Energy, First Utility, Good Energy and LoC02 are becoming more well known. Many of them provide 100% of their electricity from renewable sources, an important consideration for many consumers choosing a new supplier.

Some people find that gathering information to make a decision about potentially switching supplier encourages them to record their electricity use more carefully, identifying trends and focusing on the number of units used as well as the costs. In so doing they become more aware of their usage and this leads to savings in consumption as well as unit costs, a double benefit of switching.

While a series of meter readings will be useful to get a more accurate report, all you actually need to make energy supplier comparisons is your postcode and a recent energy bill (or information about your household and lifestyle). It only takes about ten minutes. Ideally, use an Ofgem Confidence Code accredited comparison site, and be aware that you may need to opt in to seeing the data about suppliers that the website does not directly deal with.

Enter the information that is requested, review the results, and pick a new plan. It is as simple as that. Some options will be variable rates, some will be fixed over a specified term, and some will have early exit fees. The choice is yours.

The switchover will take around three weeks, and there will never be an interruption to supply. The same cabling and meter will be used. The only noticeable changes will be the company name on the bills, and the reduced amount on the bottom line!

A Proactive Approach to a Passive House

EPC - Passive House

A proactive approach to a Passive House

‘Passive House’ is a standard for a cost-effective, low-energy construction concept that produces buildings with remarkable energy efficiency qualities without compromising on comfort.  

With all of the necessary information published freely on-line, it is claimed that any competent architect can design a Passive House. The standard is also relevant to non-residential buildings such as schools and offices. While it is most simply achieved with a new-build, it can also be successfully applied during a major building renovation.

Passive House buildings combine the use of energy efficient materials, a very high level of floor, window, roof and wall insulation and an airtight design. They are designed to be ‘thermal bridge free’, meaning the insulation has no cold corners or weak spots, reducing any problems with condensation. Ventilation is nevertheless essential, and an unobtrusive system supplies constant fresh air to maintain high levels of internal air quality without creating draughts. It incorporates a highly efficient heat recovery unit that captures heat for re-use in the building.

The designers ensure that the building makes such efficient use of the sun, internal heat sources such as domestic appliances and heat recovery that a conventional heating system is unnecessary, even on the coldest days of winter. This is what defines a Passive House. During the summer, passive techniques such as strategic shading help to keep the building comfortably cool.

Tests and calculations on existing Passive House dwellings are producing some impressive data. Measurements carried out on more than a hundred Passive House properties in central Europe as part of the European Union’s CEPHEUS project showed average energy savings of approximately 90% by comparison with traditional building stock, and 75% savings against new-build equivalents.

As a result, Passive Houses are environmentally friendly by definition. While some additional energy may be required initially for their materials and construction, this is insignificant by comparison with the energy savings they enable throughout the life of the building.

Similarly, the necessary financial investment in high quality materials and design required by the Passive House standard will be offset by the greatly reduced cost of installing and running heating and cooling systems. Calculations for German Passive Houses suggest that initial construction costs are now only approximately 5% higher than those of a comparable traditionally built house. Payback periods of course depend on the size and construction cost of the building, but under most circumstances the reduced running costs are likely to offset the construction costs in two to three decades, even allowing for loan repayments.

The Building Research Establishment (BRE) is one of the certifying bodies for Passive Houses, and there are fewer than a hundred of its Passivhaus buildings in the UK. The ‘Sleepy Dorset’ blog (here) tells the story of one family’s self-build Passive House since 2016 and its successful achievement of Passivhaus status. It relates how the house performed in Dorset’s coldest winter weather for many years in March 2018, and how the family awoke each morning to a comfortable 18ºC without any heating, despite outside temperatures of -6ºC and thick snow.

The Biomass Boiler Alternative

Biomass Boiler

An Introduction to Biomass

Households that are not keen on modern renewable energy technologies might prefer a more traditional wood burner or biomass boiler. Man has been burning wood to provide heat since he first harnessed the power of fire in his cave, but a modern biomass boiler offers a more sophisticated solution to home heating.

Simple wood burning stoves provide heat and a focal point for the main room and can include a back boiler to run small-scale central heating and hot water systems. A biomass boiler works like a normal gas or oil boiler but they burn renewable biomass instead. New generation systems are easy to use and deliver greater than 75% energy efficiency using pellets or properly dried wood.

Systems are available for a range of fuels, including logs, wood chips, sawdust, grass-derived biomass pellets or even peat. The choice of fuel will be dictated by the availability and price of a reliable local supply and the type of storage available. The greatest savings are made when buying in bulk so to get the best deal a significant amount of storage space is required.

Pellets are much easier to transport and store than logs, and provide a more controllable heat. Pellet-fuelled biomass boilers are available with automatic fuel feeders and they can be programmed in much the same way as conventional gas boilers. Log-burning stoves and boilers involve considerably more work and are less controllable.

The installed cost of a wood burning stove will be around £2,500 to £7,500, depending on the model and the availability of a flue. The price of a full biomass boiler system is greater than that of a comparable gas boiler at between £10,000 and £20,000, depending on model, size and ease of installation.

After the initial outlay, the system should reduce energy bills over time, with some studies suggesting that a biomass boiler can save the average household up to £800 a year when compared with standard electric heating, or up to £210 a year compared with an old G-rated gas boiler. However, at typical 2018 prices, running a biomass boiler is likely to cost more than a modern condensing gas boiler.

To maintain efficiency, the flue will need to be cleaned annually at a cost of around £50. Another downside is the need to remove and dispose of ash. Some biomass boiler systems have automatic ash removal and compression systems that make the job easier.

Government support is available for the installation of a biomass boiler or biomass stoves with a back boiler through the Renewable Heat Incentive scheme. The income depends on the system and the amount of energy it produces but the payment for a biomass boiler in a four-bedroom, detached house may be nearly £2,000 per annum. To be eligible, the property must have a compliant EPC that is less than two years old.  There is a calculator and information on the BEIS website here.

Energy Storage – What’s in Store for Out Electricity Supply

Energy Storage

What exactly is in store for our electricity supply?

Despite the drive to make our homes more energy efficient, the demand for electricity remains strong.  As the traditional generating stations come to the end of their lives and we strive for a lower carbon economy, there is an ever-increasing reliance on renewable sources of power. The costs are coming down, but wind is unpredictable and intermittent and we cannot rely on the sun to provide us with the electricity we demand at the flick of a switch, especially at night.

It looks as though energy storage will need to become an essential part of our electricity supply system if we are to achieve our green goals and keep the lights on. Electricity storage technology can overcome the issues associated with the intermittency of renewables and help to meet the morning and the evening peaks in demand, whether at a domestic, community or national scale.

At present, energy storage capacity in the UK represents a tiny part of our electricity consumption and depends heavily on a few pumped storage hydroelectric facilities. We are otherwise reliant on switching generating stations on and off, or on importing renewable hydropower from Norway to deal with the fluctuations.

Research into battery technology has really taken off. The Government’s January 2017 Industrial Strategy Green Paper (here) states:

Given the UK’s underlying strengths in science and energy technology, we want to be a global leader in battery technology…’

The Government went on to launch a £9 million competition to find ways of reducing the cost of energy storage technologies, including the Faraday Challenge – a £246m commitment up to 2021 on battery development for transport, home and industrial applications.

The costs of storage are reducing as this research progresses.  In its 2016 report to the Renewable Energy Association, The development of decentralised energy and storage systems in the UK, KPMG predicts that there will be a ‘steady cost decline of 12% per annum through to 2020…’ (available here).

At the moment, most of the interest is in lithium-ion batteries and this technology accounted for 83% of installed global storage capacity in 2016 (excluding pumped hydro). The costs continue to fall with close to a 20% reduction in 2016.  Some issues remain with the relatively short life of the batteries and a deterioration in their efficiency as they are cycled through charging and discharging.  The focus could change in the medium term to developments in hydrogen and heat storage that are creating some excitement.

Products are already appearing for domestic use. They are arguably led by Tesla which is building a ‘Gigafactory’ in the US to produce batteries for its vehicles and for other domestic and commercial uses. Once complete, Tesla expects the Gigafactory to be the biggest building in the world, and it will be entirely powered by renewable energy sources. The factory brings an economy of scale that should make batteries more efficient and affordable.

Tesla is already marketing its solar roof tiles and ‘Powerwall’ domestic energy storage systems. These harvest and store electricity produced during the day for use when household demand is greater in the morning, evening and at night.

The Importance of Reducing a Carbon Footprint

Carbon Footprint

The other EPC

Most people have financial savings at the forefront of their minds when considering home energy efficiency improvements. Some will have more than a passing thought for the environment.  Whatever the motivation, individual households can make an important contribution towards national energy efficiency goals and greenhouse gas reduction targets. While focussing on the primary meaning of EPC, an Energy Performance Certificate, we should not lose sight of the second, Every Property Counts.

Better energy efficiency brings reductions in carbon dioxide emissions, which account for some three-quarters of the greenhouse gases released into our atmosphere.  Carbon dioxide is produced whenever fossil fuels such as coal, gas and oil are burned to produce energy for transport, heat or electricity generation.

A ‘Carbon Footprint’ is not a buzzword, it is a very important consideration for us all.

The vast majority of scientists now believe that our greenhouse gas emissions are contributing to climate change. They form a blanket in the atmosphere that traps some of the reflected energy from the sun, causing warming that affects the oceans, ice caps, vegetation and weather patterns. This is beginning to have serious consequences for the environment and for the wildlife and people that live within it. Carbon dioxide can persist in the atmosphere for up to 200 years, so even if we take urgent action now, emissions that have already been released that will continue to affect our climate for generations to come.

Some of the consequences of climate change are potentially disastrous. Precipitation is reducing in some areas around the world, causing drought, while others are experiencing increased rainfall and storms, exacerbating sediment runoff into rivers and drinking water supplies, and producing more frequent and severe floods.

Increasing temperatures are melting ice sheets at the poles and causing sea level rise, adding to the risk of flooding at the coast and threatening the very existence of some low-lying islands.  Rising sea levels can also cause saltwater to infiltrate some freshwater systems. 

Overall, climate change is increasing the demand for water while the supply diminishes. In turn, this will affect food production, levels of malnutrition and disease in some of the world’s poorest nations.

Climate change also seems to be contributing to increasing damage from wildfires and tropical storms, so the consequences can be financial as well as social and environmental.

What Can We Do?

One of the best ways of countering climate change is to address the carbon footprint of every country, industry, community and individual household. Well over 10% of the carbon emissions in the UK come from electricity use in private households, so one immediate way to reduce our carbon footprint is to take control of energy wastage. Turn off lights, heating, air conditioning and electrical appliances when they are not needed, unplug chargers, and do not rely on standby settings. Insulate your property, switch to energy efficient light bulbs, put in a smart meter, change to a new and more efficient boiler and use a microwave when possible.

It takes a huge amount of energy to get water to your home too, so conserve it by having shorter showers and turning the tap off while you brush your teeth, and save rainwater for watering the garden.

Individually, each property’s contribution may seem modest, but add them together and they may represent an earth-saving carbon footprint reduction.

Six Common Energy Efficiency Myths

Energy Efficiency

Energy Efficiency Myths

Myth One

If I turn up the thermostat the room will get warm much more quickly.

This is not the case. A thermostat simply controls the maximum temperature, so turning it up will not alter how long the heating takes to achieve that room temperature.

Myth Two

It is more efficient to keep the heating on low all the time than to keep turning it on and off.

This means that your house is heated when you are not there and that it may be cold when you are home. It is far better, in terms of energy efficiency, to use a timer to heat the rooms that you are using while you are there. On a regular daily cycle, it is not necessary to have the heating on constantly to keep the fabric of the house warm. If you are away in winter, use a timer and thermostat to avoid frost damage to pipes. You can use radiator valves to restrict the heating to the rooms that you are using. Most people find 18°C to 21°C comfortable in an occupied room, and radiators can be turned down to 14°C or lower in other rooms.

Myth Three

When it is cold outside I need to turn the thermostat up to keep the house warm.

A thermostat maintains a desired temperature in the house no matter what the weather is doing outside.  Once you have selected your comfortable temperature, it can remain at that setting which improves your home’s energy efficiency.

Myth Four

Energy saving light bulbs take a long time to get bright, and they are very expensive.

There have been improvements in lighting technology in the last few years, especially with light emitting diode (LED) bulbs. They reach full brightness immediately, have reduced in price, typically last for over 20 years and their running costs are approximately a third of those of a comparable traditional halogen bulb.  

LED bulbs are now the best choice in terms of practicality and energy efficiency.

Myth Five

An appliance in standby mode does not use much energy..

Appliances on standby still use electricity. For an average household, turning them all off completely when they are not in use could save nearly £50 a year.

Myth Six

My vital appliances are responsible for much of the energy I use, so there is nothing I can do to reduce consumption.

Large appliances are responsible for about 15% of the energy bill for an average home, so dealing with the energy efficiency of heating is a greater priority. Nevertheless, choosing energy efficient appliances can also make a real reduction in consumption and bills. Compare energy labels on appliances before buying. Choosing an A+++ tumble dryer rather than a C-rated model can save approximately £50 per year.  A new A+++ electric oven will use some 60% less energy than a B-rated equivalent. 

Careful planning of how you use your appliances could also help. Dishwashers are very energy hungry, and can cost an average household nearly £50 a year to run. Consider whether you really need to use it to wash a few plates and make sure you wait for a full load before turning it on.