Martin Lewis explains whether leaving heating on all day saves money

Martin Lewis busts myth that it’s cheaper to leave radiators on at a low temperature all day as he insists turning heating on and off is the best way to save money

  • Martin Lewis, of Money Saving Expert, has provided insight into heating homes
  • Advised against leaving the heating on all day because it wastes energy in house
  • Said it may be better to set timers to heat the house through only when required
  • Some dismiss these claims, suggest switching on and off causes condensation 

As the chillier days begin creeping in, the heating can become a hot topic in many households.

And now money expert Martin Lewis, 48, from London, has revealed it is cheaper to switch heating on and off throughout the winter months to adjust the temperature as you need it, as opposed to leaving radiators running on low all day.

While some refuse to turn the heating on until temperatures drop to a certain degree, Money Saving Expert Martin Lewis has written in his weekly newsletter to help those who have taken the plunge and fired up the radiators this autumn, The Mirror reports. 

Martin revealed the best way to save money using your heating is to use it as and when needed, explaining: “Having the heating on only when you need it is, in the long run, the best way to save energy, and therefore money.’

Martin Lewis, 48, from London, revealed the best way to save money using your heating is to use it as and when needed 

Martin urged customers to take a look at his ‘Energy Mythbusting’ guide where he provides tips and advice for those trying to spend less on their bills. 

There he makes reference to the Energy Saving Trust, an organisation dedicated to promoting energy efficiency and the use of sustainable energy, which suggests the concept of leaving the heating on a low heat all day is a myth. 

Instead, they advise people to only use the heating when they need it, in order to save energy as well as money.  

Adding to the debate on the MoneySavingExpert site, Martin Lewis said: ‘A timer is best as your thermostat turns your heating on and off to keep your home at the temperature you set.

The money saving expert said adjusting heating throughout the day depending on the temperature was more cost-efficient than leaving it on a low heat all day 

‘The key thing to understand here is that it’s all about the total amount of energy required to heat your home.’

Because homes lose a bit of energy throughout the day, the Energy Saving Trust advises to only heat the house when you need it, to avoid constantly losing energy with the low temperature heating. 

But not everyone agrees with this theory,  with some specialists suggesting keeping the heating on a low heat all day will help prevent condensation within the walls. 

According to the skeptics, the condensation created when turning the heating on and off can conduct heat outside of the house and result in more energy being used. 

Martin (pictured) said people should make sure they know just how much energy their home needs in order to save the most amount of money

In the newsletter, Martin says heating-all-day advocates suggest having all the radiator valves on the maximum setting and the boiler as low as possible is a better solution. 

Kilian Pender, a member of staff at Hiber, a boiler replacement company, told the Mirror that people are better off setting times – setting it to come on 30 minutes before you wake up and to go off 30 minutes before you leave.

Price comparison site USwitch agrees, and encourages people to make use of their thermostat by setting up a different temperatures and different times for it to come on – depending on your schedule. 

Martin Lewis busts other energy saving myths

As well as helping people decide how best to heat their home, Martin Lewis has provided insight into other myths.

Clingfilm on the windows

The Energy Saving Trust says adding a transparent and airtight material over the window can act as a layer of secondary glazing.  

Hot water boiler on 24/7

For those with gas, oil or LPG central heating will be better off setting a timer for hot water to come on when people in the house need it. 

But people on the Economy 7 or 10 tariff with electrical immersion heaters, water is cheaper to heat at night.   

Chargers use electric when plugged in but not connected to a device

According to Martin, British Gas said chargers still use a significant amount of energy when sat in the socket. 

He advises people to avoid hidden costs by turning off devices at the wall. 

Appliances cheaper to run at night 

Those with an Economy 7 or 10 tariff will be able to save money at night but will pay more than the average in the day. 

Martin says people on other tariff are unlikely to see a saving between day and night. 

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