When temperatures rise, most homeowners stop thinking about their heating systems altogether. After months of keeping your home warm through autumn and winter, it can be tempting to simply switch everything off and forget about it until the colder weather returns.

However, experienced heating engineers often say that summer is actually the best time to maintain your heating system. A little attention during the warmer months can help prevent breakdowns, improve efficiency, extend the lifespan of your boiler, and ensure everything is working properly when you need it again.

Here are some practical steps homeowners can take to keep their heating systems in excellent condition throughout the summer.

Don't Switch Your Boiler Off Completely

One of the most common mistakes homeowners make is leaving their boiler completely inactive for several months.

Many heating engineers recommend using your boiler's summer mode, if available, rather than turning the system off entirely. This allows the boiler to continue providing hot water while keeping the central heating switched off.

If your boiler doesn't have a dedicated summer setting, consider running the heating for 10–15 minutes every few weeks. This helps keep pumps, valves and other moving components working freely and can reduce the risk of parts seizing during long periods of inactivity.

Many modern boilers also feature a "Holiday" or "Away" mode, which keeps the system safely ticking over to prevent pipes from seizing without impacting energy use.

Your Annual Boiler Service

Book Early

Summer is widely regarded as the ideal time to arrange your annual boiler service.

Heating engineers are generally less busy than during autumn and winter, making it easier to secure convenient appointment times. Any issues discovered during servicing can also be addressed before the colder weather arrives.

An annual service helps maintain efficiency, identifies potential faults early, and may be required to keep manufacturer warranties valid. It also provides important safety checks, including inspection of combustion performance and ventilation.

Book Your Boiler Service

Bleed Your Radiators

Summer provides the perfect opportunity to inspect your radiators.

If you noticed cold spots during winter, trapped air may still be affecting performance. Bleeding radiators helps improve heat distribution and allows your heating system to operate more efficiently.

While carrying out these checks, look for signs of corrosion, leaks, rust patches or radiator valves that appear stiff or difficult to operate. Addressing minor issues now can help avoid emergency repairs later in the year.

Optimise Your Heating Controls

Even during warmer weather, it's worth reviewing your heating controls and settings.

Check that timers, programmers and thermostats are operating correctly. Many homeowners discover their heating schedules are still configured for winter, resulting in unnecessary energy use.

If your system allows it, switching to hot-water-only mode can improve efficiency and reduce unwanted heat generation within the home. Some heating specialists also recommend reviewing boiler flow temperature settings to ensure they are operating efficiently.

System Upgrades

Summer provides the perfect time to upgrade your heating system ensuring minimum stress and avoiding the cold while your heating system is down.

Sussex Renewable Heating assist customers across the Worthing and West Sussex with a wide range of heating system upgrades including:

Power Flushing

The summer is the perfect time for a professional deep clean of your central heating system.

Power flushing uses specialist equipment to circulate high-flow water and cleaning chemicals through your pipes, radiators, and boiler to remove accumulated sludge, rust and debris.

Sussex Renewable Heating provide Power Flushing to households and businesses across Worthing and West Sussex.

Book a Power Flush

Prepare Now, Stay Comfortable Later

Your heating system may not be getting much use during hot weather, but that doesn't mean it should be ignored.

A few simple maintenance checks throughout summer can improve efficiency, reduce the likelihood of unexpected breakdowns and help extend the life of your boiler and heating system.

Run your heating system briefly and identify potential problems early. Pay attention to banging, gurgling, whistling or vibrating sounds coming from the boiler, radiators or pipework. These noises can sometimes indicate trapped air, circulation issues, sludge build-up or failing components.

By taking a proactive approach now, you'll have peace of mind knowing your home is ready when temperatures begin to fall again.

Summer Heating Maintenance Tips

Protect your boiler, improve efficiency & prevent costly breakdowns.