A Pre-Winter Boiler Checklist for London Homes
The best time to sort out your boiler is before you actually need it every day. Here's a short, practical checklist to work through before the heating season starts.
Book the Annual Service Before the Rush
Demand for boiler servicing rises sharply as the weather turns, and booking slots become harder to get exactly when boilers are most likely to be relied on daily. Booking your annual service in late summer or early autumn, rather than waiting until the first cold snap, is the single most useful thing on this list.
Check Your Gas Safety Certificate Renewal Date, If You're a Landlord
If you let a property, check when your current Landlord Gas Safety Certificate expires. Renewing it ahead of winter — rather than letting it lapse and scrambling to arrange an inspection once a tenant is already relying on the heating — avoids both a compliance gap and a less convenient booking window.
Bleed Your Radiators
If radiators are cooler at the top than the bottom, there's likely trapped air inside, which is straightforward to release by bleeding them. This is something most homeowners can do themselves, and it's worth doing before winter rather than discovering cold radiators on the first genuinely cold week.
Check System Pressure
Most sealed systems display their pressure on a gauge near the boiler, usually expected to sit within a range marked on the gauge itself — check your boiler's manual for the specific range for your model. If it's reading low, that's worth mentioning when you book your service rather than waiting to see if it worsens.
Consider a Wider System Health Check
If you've never had anything beyond the boiler itself looked at, a central heating system health check before winter can catch issues with radiators, controls or circulation that an annual boiler service alone wouldn't cover.
Know Where Your Stopcock Is
This isn't boiler-specific, but it's worth confirming before winter: know where your property's main stopcock is and that it turns freely, in case you ever need to isolate the water supply quickly.
Put the Renewal Dates Somewhere You'll See Them
Whether it's a calendar reminder or a service plan that handles scheduling automatically, having next year's service date (and Gas Safety Certificate renewal, if applicable) somewhere visible is what actually prevents this list from needing to be redone under pressure next autumn.
Frequently asked questions
When is the best time to book an annual boiler service?
Late summer or early autumn, before demand rises with the colder weather. Booking early means more availability and gets any issues found resolved before you're relying on the heating daily.
What does it mean if my radiators are cold at the top?
This usually means there's trapped air in the system, which can be released by bleeding the radiator. It's a common, straightforward maintenance task most homeowners can do themselves.
Should landlords renew their Gas Safety Certificate before winter specifically?
It's good practice to check the renewal date well before winter rather than letting it lapse. A gap in compliance is more disruptive to fix once a tenant is relying on the heating system daily.