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16 Energy Myths busted - Spend less on gas and electricity

Should you keep your heating on all day on low in your HMO? And what about painting radiators black?

We've gone on an energy mythbusting mission, to help landlords cut energy bills to see if common tricks to cut energy usage really work. It’s not just about using less - switching your energy tariff will save you typically up to 30% of your bill worth hundreds of pounds in a typical HMO. It's the same electricity, same gas and same safety – only service, billing and price changes. You can also save just by changing tariff with their existing supplier. Your cheapest deal depends on your property details – email your last bill to [email protected] to find out what you could be saving. We asked members to tell us their energy-saving tips 'n' tricks – then we asked the Energy Saving Trust (EST) and British Gas to tell us if these actually work. Here are questions you asked, with their answers below. 1) Should I leave the heating on low all day even when the tenants are out, or have on timer only when they need it? According to leading energy experts at the Energy Saving Trust, as well as British Gas, the idea that it's cheaper to leave the heating on low all day is a myth. They're clear that you'll save energy, and therefore money, by only having the heating on when it's required. (Using a timer's such as TimeOStat is best, because your thermostat is designed to turn your heating on and off to keep your property at the temperature you set it.)

The key thing to understand here is that it's all about the total amount of energy required to heat your property. It's a given that a certain amount of energy is constantly leaking out of your property (though exactly how much will depend on how good your insulation is). So the Energy Saving Trust says if you're keeping the heating on all day you're losing energy all day - and therefore it's better to heat your property only when you need it. However, it's not quite that clear-cut. Some specialists disagree – and argue you should keep the heating on constantly for an entirely different reason. They advocate keeping the heating on low all day, turning all radiator valves up to the max and the boiler down to the minimum, and say that the problem with turning the heating on and off is that every time it's turned off, condensation collects within the walls. This condensation can help conduct heat outside the property, they say – meaning you leak heat more quickly and so will use more energy as a result. PIRC feedback: As a Money Saving Site, its clearly better to only have heating on when needed. Yet as a balance, if you go down the route of having the heating on only at certain times, you could install an envirovent heat recovery unit, so the house will be nice and toasty when needed and not damp, but you’re not pumping out energy all day. Want to know how to save £100s on your bills too? Check now if you can switch and save with our Cheap Energy Buying Club. 2) Should I put clingfilm on the windows? Bizarrely, this one actually works – although clingfilm is more normally used to wrap up your sandwiches, it can actually help keep your property warm. The idea is that putting a sheet on your window traps a small layer of air which can help stop heat escaping. According to the Energy Saving Trust, in principle you can use any material for the second layer of glazing, as long as it's transparent and airtight. However, there are a number of factors to take into account. While clingfilm works in theory (or as a short-term measure), in practice you'll probably want to use specialist secondary glazing as it'll last longer. If you have double-glazing, adding a third layer could still make you a little warmer, but the benefit will be much less than when dealing with a single glazed window. If your windows are draughty, it's worth fixing that as well as adding secondary glazing, as otherwise you'll only get half the benefit. 3) Should I keep the hot water boiler on all the time, or turn it on and off as needed?

If you have a gas, oil or LPG (liquefied petroleum gas) central heating system, it will always be cheaper to time the system so the hot water comes on only when required. However, if you use an electrical immersion heater and have an Economy 7 or 10 tariff (where energy is cheaper at night), it's cheaper to heat your water during the night. Make sure your tank is well insulated to prevent it cooling during the day, though. 4) Is it cheaper to use radiators or electric heaters? Electric heaters are one of the most expensive forms of heating. Generally, the cheapest way is using an efficient gas central heating system, with a full set of thermostatic radiator valves, a room thermostat and a timer. 5) Do phone or laptop chargers still use electricity when plugged in but not connected to a device?

Try to unplug chargers when not in use. British Gas says on its website that a lot of chargers use energy when left in a socket (if the charger is warm, it's using energy). A lot of devices, such as games consoles, laptops and TVs, also draw power when plugged in and not in use. This is sometimes known as 'vampire power'. Using this standby power can be easily avoided by switching devices off at the wall. The Energy Saving Trust estimates that a typical household wastes between £50 and £80 a year by leaving devices plugged in or on standby.

6) Should tenants run appliances at night? If you're on an Economy 7 or 10 tariff, you'll pay less during the night, but a higher rate than average during the day. But if you're on another tariff, it doesn't make any difference. PIRC tip: This has been answered from an energy use perspective. Before you use an appliance at night, check it's safe. If you're unsure what tariff you're on, check your latest energy bill or ask your energy company. 7) Should I set thermostats on individual radiators, rather than using the main thermostat to control all of them? It's best to have as many controls as possible, so you're in charge of the way you want your home to be heated. Installing thermostatic radiator valves and using them with your thermostat could save £75 per year according to the Energy Saving Trust. The Energy Saving Trust recommends using the thermostat to control the heat in your main living space and using thermostatic radiator valves to lower the heating in rooms you don't use as often.

8) What’s the difference between controlling the heating using the thermostat or radiator valves? Thermostats control your boiler, whilst radiator valves control the water flow through each individual radiator. Your thermostat controls your home's temperature, so once it hits the temperature you set on the thermostat, the boiler will go off, until the room temperature drops again. Radiator valves are an extra control which you can use to set the temperature of each individual room (other than where your main thermostat is). This means you can set some rooms to be cooler than others if you don’t use them very often (saving energy and money). When the temperature in that room rises above what’s set on the radiator valve, it will stop water flowing through that particular radiator - the boiler will still be on to heat other rooms, but it will use less energy. 9) Would painting my radiators black or putting reflective panels behind them help? Where painting your radiators black is concerned, the answer's no. It's best to keep them the standard white, although the difference is not huge. Radiator panels can save energy, but not very much. It's more important to insulate your walls to prevent the heat leaking out of your property altogether. As for putting reflective panels behind radiators, yes, these could help cut energy use. The idea's they reflect heat from the radiator back into the room, so it doesn't escape through external walls. The Energy Saving Trust says homes with uninsulated walls will get most benefit. 10) If the heating is on, should tenants keep doors open or closed for each room?

It's better to keep doors closed for the area you want heated. Radiators, electric panel heaters and convection heaters all work by creating a convection current in a room. As hot air rises, it circles around to the other side of the room, cools and sinks and travels back along the floor to the heater to be reheated again. Closing doors makes sure this current remains within the designated space. 11) Should I leave lights and appliances on, or turn them on and off each time? Turn them off when you don't need them, fitting motion sensors in your properties will deliver savings, PIRC have these available through CEF. Also avoid leaving TVs and other devices on standby.

12) Should tenants use a tumble dryer, or place washing on an airer with heating on? An airer is better because tumble dryers use a lot of energy. Try timing it so you put your washing out on a clothes horse during the hours your heating comes on. Drying your clothes indoors on an airer can cause problems with condensation and damp, especially in old and poorly insulated homes, so it is best to dry your clothes outdoors whenever the weather allows. Fitting an Envirovent heat recovery and moisture extraction unit would be highly recommended.

13) Are halogen heaters cheaper than other portable heaters and central heating? This depends what you're after. Halogen heaters are directional. Once on, you instantly feel the heat. As soon as you turn them off, the heat quickly dissipates. Convection heaters, electric panel heaters or free-standing electric radiators work by heating the air around them to create a convection current. They take some time to heat a room, but once turned off the heat lingers. Usually, it’s best to use your central heating to heat your home rather than relying on electric heaters, especially if you have gas central heating. If you're only using a couple of rooms, you can use thermostatic radiator valves so that your central heating isn't heating empty rooms. Electricity is much more expensive than gas, so using electric heaters can ramp up your energy bills 14) Should I use an immersion heater to heat water, or the boiler? Generally, using the boiler for hot water is cheaper, due to the higher average cost of electricity. However, if you're able to use a lower rate electricity tariff (such as Economy 7, where power is cheaper at night) at the right time, it can work out more cost-effective. This is also dependent on the efficiency of your central heating system. 15) Is a combi boiler cheaper to run? The Energy Saving Trust says whether a combi or a standard boiler is cheaper to run will depend on your lifestyle and how much hot water you use. With a standard boiler, water is heated by your boiler and stored in a hot water tank for when you need it. With a combi boiler, you don’t have a hot water tank and instead water is heated up instantly when you turn on the hot tap. If your HMO doesn’t use too much water, combi boilers can be more efficient, as they don’t leave water sitting in a tank where it can lose heat or be a legionella risk. However, combi boilers tend to be less efficient at heating water in the first place, so if you’re a large property using lots of water it might be cheaper to have a standard boiler with a well-insulated tank. For both combis and standard boilers, the main thing which will affect how expensive your boiler is to run is its efficiency. Having an A-rated condensing boiler (standard or combi) will be cheaper to run than an older non-condensing boiler. 16) Should you leave your heating on if you have a void? To prevent frozen pipes, which can cause hundreds of pounds of damage, the Energy Saving Trust recommends you leave the heating on to some degree during winter even if you're not there. Bonus Tip 17) Use PIRC Energy Access wholesale utility pricing to save up to 30% on your bills and fix rates for up to 5 years. With prices increasing by approximately 15% pa, no more price increases for several years is very attractive. See our article on How to access Wholesale Utility Pricing Check your Landlord and Tenant insurance policy for long voids. The rule of thumb is to keep your heating at a minimum 12 degrees, rather than switching it off

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