---
title: Pre-Winter Boiler Service Checklist for London Homes
description: Get winter‑ready. What to check at home and what a professional boiler service includes. Book across South London and North Surrey.
image: https://www.trustedboiler.co.uk/hubfs/20250826_105620.jpg
---
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# [Pre‑Winter Boiler Service Checklist for South London Homes](https://www.trustedboiler.co.uk/blog/pre-winter-boiler-service-south-london)
[](https://www.trustedboiler.co.uk/blog/author/eric-saayeng)
by [Eric Saayeng](https://www.trustedboiler.co.uk/blog/author/eric-saayeng)
1 min read
Oct 6, 2025, 8:15:52 AM
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## 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](tel:0800111999).
## 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](tel:02045720447) or [request a slot online](https://www.trustedboiler.co.uk/).
[Boiler Service in Sutton](https://www.trustedboiler.co.uk/boiler-servicing) | [Boiler Repair in Croydon](https://www.trustedboiler.co.uk/boiler-repairs) | [Combi Boiler Replacement](https://www.trustedboiler.co.uk/combi-boiler-installation)
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