Boiler Switch Off

When boilers in Colchester may switch off for summer and what you need to do before

As the colder months draw to a close and our big coats go into the cupboards, our boilers will also be getting a rest as demand for heating in our homes decreases.

In order to make sure our boilers are fighting fit for when they come back into regular use at the end of summer, there’s key checks to make now before the big switch off.

When will boiler use decrease in Colchester?

We’ve crunched the numbers on five years of historic daily temperature data in Colchester from the ¹ Met Office to establish when the average temperature reaches a point where heating in most homes won’t be needed.

To pinpoint an estimate date, we’ve tracked the exact point in the year where average daily outdoor temperatures in Colchester start to increase beyond 15.5 °C for more than seven consecutive days.

The heating threshold of 15.5 °C is used to count ‘heating degree days’ in the UK. Typically homes experience heat gains from occupants, appliances and lights which increase the internal temperature. Therefore, a building doesn’t typically need heating unless it drops below the ‘heating threshold’.

According to the data from the past five years, heating in Colchester homes will start to turn off in the first three weeks of June.

But, by taking the earliest and latest date over the five years when a consecutive week of exceeded heating threshold temperatures started, we can establish a median date to make an estimate of the day boilers will wind down.

We estimate the ‘Boiler Switch Off’ day in Colchester to be 11/06/2025, 10 days before the summer solstice.

What should you do before your boiler goes into summer mode?

Service for peace-of-mind

Overdue or due a boiler service, well now is the perfect time to get one secured. Just ² 66% of households in the East of England have their boilers serviced annually – that means 1 in 3 homeowners in the region are skipping an annual boiler service.

Households in the East of England region tend to experience slightly more issues with their boiler than the rest of the UK – 37% vs 35%.  This could be because boilers are slightly older in the East of England, with 29% of homeowners running one that’s 11 years old or older vs 25% of UK.

Regular annual servicing can help identify potential issues early and support efficient operation, as well as help maintain warranties.

After a busy winter, checking in on its health now is a good idea as it winds down into the summer to save a nasty surprise as winter rolls back around.

Keeping your boiler clean and well maintained can help it run efficiently, which may support more effective energy use.

Check your radiators for cold spots

Are there any cold spots across your home’s radiators?

If so, this is a sign of air in the system, which means your home isn’t heating as well as it could. The summer wind down for our boilers is a great opportunity to bleed radiators and ensure they’re all heating up when needed.

Plan for regular summertime checks

Summer may live up to its name, and as we’re enjoying barbecues and time in the garden, switching our heating on may be the last thing on our minds.

However, regularly checking in on your boiler and heating system by switching it on for 15-30 minutes is a good way to ensure that it’s still working well and there isn’t anything to be concerned about.

Catching a concern in summer when demand for engineers is typically lower is better than the peak of demand when you really need your heating, you don’t want to be in a position where you need a new boiler installation at the start of winter.

Know your pressure

Ensure your pressure isn’t too high or too low and that it is within the manufacturer’s recommendation.

Boiler pressure that’s too high or low may lead to a system shut down, among indicating other issues like radiators that won’t heat up, no hot water or system leaks.

If you need help with the summer shut down and safety checks ahead of the summer switch off date in Colchester, then get in touch below.

Methodology

• To establish the average daily outdoor temperature in Colchester, we took the average between the max and min temperature readings per day across all Colchester readings.
• Data collated via Walnut Market Sizing Survey, fieldwork took place in January 2025.