Why having your thermostat in the hallway could be costing you – and other heating mistakes

Independent

27-02-2025

Many British households are making several common mistakes when it comes to keeping their home warm - that could be adding as much as £460 a year on to the average bill.
Helpfully, British Gas smart energy engineer Jessica Rawstron has shared some common mistakes she often sees while out on the job.
Rawstron says: 'Every winter, we see lots of households unknowingly waste energy, and risk issues such as boiler breakdowns by making simple heating mistakes. Being aware of these common errors, and avoiding them, can make a real difference with your energy bills.'
Here, Rawstron highlights the common mistakes that people make, which could lead to some people throwing money away while they are heating their home:
1. Thermostat problems
Ben Gallizzi, an energy specialist at Uswitch.com, told Bristol Live, the placement of the thermostat was of utmost importance.
He said: "Placing it in a room that is colder than the rest of the house, such as a hallway, is a bad idea as it will turn on and off at the wrong times.
"For example, if you open the front door and let in cold air, then the thermostat may tell your heating system to send out more heat as it thinks the whole house is below your desired temperature."
People also made the mistake of having their thermostat too high.
Rawstron said on frosty mornings and chilly nights, it can be particularly tempting to really ramp up the heating to a high temperature.
But instead she suggests setting the main thermostat to between 18C and 21C, and popping on some extra layers if you're still feeling the cold, to save on heating bills.
According to calculations from British Gas, for an average household, lowering the thermostat temperature by just one degree could save around £115 a year.
2. Having the boiler flow temperature too high
Rawstron explains that, in the same vein as having the thermostat set too high, the boiler's flow temperature is another setting that could be costing some households. This is the temperature that the boiler heats water to before it reaches your radiators.
According to British Gas calculations, some households could potentially keep around £65 in their pockets annually by making sure the boiler flow temperature is set between 55-60C, to help with optimum efficiency.
Rawstron says: 'Altering the temperature on a conventional boiler with a hot water cylinder involves adjusting one dial.
'With a combination boiler with no hot water cylinder, there will be two dials, one for radiators and another for hot water. It's the radiator setting you'll need to change.'
3. Not making the most of smart technology
'Each winter, we see thousands of people miss out on big savings by not investing in smart technology for their home,' Rawstron adds.
Smart thermostats can allow homeowners to set energy-saving schedules and alerts for if they leave the heating on when they're not at home.
British Gas estimates that some homeowners could save as much as £175 per year on their heating bill.
Rawstron says: 'Once you've invested in the tech, make sure to position it in the right location to maximise savings.'
She says that good places to do this include the interior wall in either the hallway or in the living room.
Rawstron also cautions: 'You should also avoid putting the thermostat too close to a radiator, direct sunlight or any draughts, as these can skew the temperature readings and lead to the thermostat under or overheating your home.'
4. Leaving hot water tanks without insulation.
Every penny counts, especially during the colder months, and if your home has a hot water tank, not insulating it can add around £50 onto a household's energy bill a year, according to the calculations from British Gas.
If you're wondering how to go about this, Rawstron explains: 'It's a quick and simple fix, with insulated jackets available online and from most DIY stores.
'Once fitted to the tank, the jacket will work to prevent heat loss, using less energy and money to keep the water warm.'
5. 'Welcoming' in the cold without realising
While you may not be leaving doors and windows wide open in the middle of winter, there are other, less obvious ways that the cold can creep in.
The escape of warmth not only makes your home less energy-efficient but it can also end up pulling on your purse strings.
Draught-proofing around your windows and doors could potentially help a household to save around £60 per year alone, according to British Gas calculations.
Luckily too, there are some simple ways to fix these invisible ways that money is 'leaking' out of the home.
'Self-adhesive foam strips are easy to fit on windows to prevent draughts, while draught excluders are perfect if there's a gap between your door and the floor,' says Rawstron.
Cold air can enter the home through the tiniest of gaps, and keyholes and letterboxes can also be culprits.
Rawstron says: 'Keyhole covers and letterbox brush strips are cheap to buy, quick and easy to fit and will stop those draughts.'
In addition to Rawstron's tips, you may also want to consider the floor you're standing on.
The Energy Saving Trust says that insulating the ground floor can be a great way to help keep a property warm.
The Trust also suggests considering insulating any floors that sit above unheated spaces, such as garages.
Hopefully that way you can avoid your money 'escaping' along with the warm air.
People struggling with their bills should contact their provider and debt support charities can also help.