When the sun is out and radiators are off, it is easy to forget about your boiler. Yet summer is one of the best times to look after it. A few simple habits now can prevent inconvenient—and costly—breakdowns when temperatures fall. They also keep energy use in check and help you get more life from your system.
Two actions make the biggest difference:
- Run your boiler for 15 minutes once a month during the off‑season. This keeps key moving parts—such as pumps and diverter valves—from seizing, circulates inhibitor to reduce internal corrosion, and flags any developing faults while trades diaries are quieter.
- Use the summer or “hot water only” mode on modern boilers. You will still have hot water on demand while avoiding unnecessary heating cycles, saving energy and ensuring the system is primed for the colder months.
For busy homeowners and commercial property managers across Brentwood and the wider Essex area, these routines offer peace of mind. They reduce the risk of emergency call-outs, support manufacturer guarantees, and make it easier to plan maintenance around your schedule rather than the weather.
A note on safety: never remove boiler covers or attempt gas work yourself. Gas appliances must be inspected and repaired by a Gas Safe registered engineer. If in doubt, contact a professional.
Practical Summer Boiler Care: Steps That Save Money and Hassle
1) Switch to summer or “hot water only” mode
Most modern combi and system boilers include a summer setting that disables central heating while maintaining hot water. Activating this mode can:
- Reduce unnecessary boiler firing and cut energy waste.
- Keep hot water readily available for kitchens, bathrooms, and commercial washrooms.
- Minimise wear on heating components during periods of low demand.
If your controls are unclear, check your manufacturer’s guide (e.g., Worcester-Bosch, Vaillant, Ideal, Baxi). If you are unsure, a quick professional check can show you the most economical settings for your system.
2) Run the heating for 15 minutes each month
Even in summer, give the heating side of the system a short workout monthly:
- Turn up the room thermostat and ensure radiators warm for about 15 minutes.
- Listen for any unusual noises (e.g., kettling, clanking, or persistent whistling) and check that all radiators heat evenly.
- Switch back to summer mode afterwards.
Why it matters: pumps and diverter valves are less likely to stick when exercised; seals remain lubricated; corrosion inhibitors circulate, reducing the chance of sludge and internal corrosion. Catching an issue now is quicker and less disruptive than discovering it on the first cold night of autumn.
3) Check system pressure (sealed systems and combi boilers)
Most domestic sealed systems operate at around 1.0–1.5 bar when cold; always consult your boiler manual for the correct range.
- If the pressure is low, use the filling loop to top up carefully. Do not over‑pressurise.
- If pressure drops repeatedly, there may be a leak, expansion vessel issue, or faulty valve—book an engineer.
Stable pressure helps prevent component strain and maintains efficient operation.
4) Bleed radiators and free up TRVs
Air trapped in radiators leads to cold spots and inefficiency.
- Carefully bleed radiators if you notice cool areas at the top. Recheck and correct system pressure afterwards.
- Turn all thermostatic radiator valves (TRVs) fully open during summer or cycle them periodically. This helps prevent the small internal pins from sticking, a common cause of cold radiators in autumn.
5) Keep flues and ventilation clear
Visually inspect the flue terminal outside and ensure it is unobstructed by vegetation, debris, or stored items. Keep the boiler cupboard tidy with adequate ventilation—no coats, boxes, or cleaning products pressed against the unit. Proper airflow aids safe, efficient operation.
6) Test your carbon monoxide alarm
Press the test button to confirm it is working and replace batteries if needed. A functioning CO alarm is an essential safety measure for any property with gas appliances.
7) Protect against limescale and sludge (especially in hard‑water Essex)
Essex is known for hard water, which can accelerate limescale build‑up in heat exchangers and hot water circuits.
- Consider a scale reducer for combi boilers and have inhibitor levels checked during service.
- If you experience slow‑to‑heat radiators, noisy operation, or repeated balancing issues, ask about a power flush. This deep clean removes sludge and magnetite, restoring heat transfer and efficiency.
8) Book your annual service in summer with a Gas Safe engineer
A professional service is the cornerstone of reliable performance. Summer appointments are easier to secure and mean any remedial work can be completed before peak season. A comprehensive service typically includes safety checks, combustion analysis, cleaning of key components, and verification of controls and settings. It helps:
- Maintain manufacturer warranties and boiler guarantees (some models offer up to 10 years when serviced annually by a qualified engineer).
- Identify failing parts early, avoiding winter breakdowns.
- Optimise efficiency, reducing running costs.
For landlords and commercial property managers, this is the ideal window to schedule Gas Safety inspections (CP12), plan preventive maintenance, and ensure compliance before heating demand returns.
9) Review controls and upgrade where sensible
Smart programmable thermostats, weather compensation, and zoning can deliver noticeable savings and tighter comfort control in homes and multi‑tenant or commercial buildings alike. If your boiler is older (typically 10–15 years) or unreliable, a summer replacement minimises downtime and ensures you enter winter with a high‑efficiency condensing model matched to your property and budget.
10) Know when to call a professional
Contact a Gas Safe registered engineer if you notice:
- Persistent pressure loss or frequent top‑ups
- Pilot or ignition issues, error codes, or lockouts
- Water leaks, staining, or unusual noises
- Sooting, burning smells, or signs of poor combustion
- Any concerns with flues or ventilation
Attempting DIY gas repairs is dangerous and may invalidate insurance and warranties.
How these steps save you money and hassle
- Reduced breakdown risk: Exercising the system and servicing in summer prevents seized pumps and valves, clogged heat exchangers, and control failures.
- Lower energy bills: Correct pressure, bled radiators, and optimised controls mean less fuel used for the same comfort.
- Longer component life: Preventive care reduces stress on parts, helping you get full value from your boiler investment.
- Easier scheduling: With proactive summer attention, you avoid last‑minute emergency call‑outs when engineers are busiest.
Support tailored to Brentwood and wider Essex
Brentwood Heating Ltd is locally owned and operated by Lewis Trembling, with Gas Safe registered engineers who work cleanly, respectfully, and to high professional standards. We provide:
- Boiler servicing, repair, and installation across leading brands such as Worcester‑Bosch, Vaillant, Ideal, and Baxi
- Central heating installation and repairs, power flushing, and system upgrades
- Emergency call‑outs 24/7 for when the unexpected happens
- Gas Safety certification for landlords and commercial premises
- Bathroom design and installation, general plumbing, and blocked toilet solutions
Whether you are a homeowner in Brentwood, a landlord in Upminster or Hornchurch, or managing commercial sites in Southend and the broader Essex region, we offer transparent communication, rapid response, and solutions suited to your system and budget. We provide tailored quotes and can advise on the most efficient options, including extended guarantees of up to 10 years on selected boilers.
In short, do not mothball your boiler over summer. Run it for 15 minutes each month, use the hot‑water‑only mode, and schedule a professional service. These straightforward habits keep your system healthy, save energy, and ensure you are ready for the first cold snap—without the stress. If you would like expert help or a quote tailored to your property, our team is here to assist around the clock.
