Pre‑Winter Boiler Service Checklist for South London Homes

Why Book a Pre‑Winter Boiler Service?

South London and North Surrey winters can spike boiler breakdowns, especially around Sutton, Wallington, and Wimbledon. A one‑hour annual boiler service can prevent mid‑winter failures, cut energy bills, and protect your manufacturer warranty. Here’s a practical checklist — and what we do on a professional service.

Safety First

• Test your CO alarm; replace if expired.
• Keep ventilation clear of coats and boxes.
• Check for leaks, scorch marks, or unusual smells.
  If you smell gas: Turn off the gas at the meter and call 0800 111 999.

System Pressure

• Most combis should sit around 1.0–1.5 bar when cold.
• If pressure regularly falls to 0.5 bar, you may have a leak. Above 2.5 bar suggests an expansion vessel/PRV issue.
• Top up via the filling loop if confident; frequent top‑ups indicate a fault.

Radiators and Circulation

• Bleed radiators; re‑check boiler pressure afterward.
• Bottom cold spots suggest sludge — consider a system flush or magnetic filter clean.
• Use TRVs to avoid heating unused rooms.

Thermostat and Controls

• Replace batteries if needed.
• Update schedules for earlier sunsets.
• Smart controls can help reduce bills in well‑insulated homes.

Condensate and Flue

• Insulate the external condensate to prevent freezing.
• Check the flue terminal isn’t obstructed by leaves or garden changes.

What a Professional Service Includes

• Combustion checks and flue analysis
• Burner/heat exchanger/condensate clean as required
• Expansion vessel pressure check and recharge if needed
• Safety devices and seals inspection
• Water quality test and inhibitor advice
• Service record to maintain warranty

Areas We Cover

Sutton, Wallington, Croydon, Mitcham, Tooting, Banstead, Epsom, Wimbledon.

Book Your Service

Book your pre‑winter boiler service to avoid peak‑season delays. Call 020 4572 0447 or request a slot online.

Boiler Service in Sutton | Boiler Repair in Croydon | Combi Boiler Replacement