Areas covered

London, Essex and Hertfordshire. Each area page covers the housing stock there and what it tends to mean for heating systems — because a 1930s Metroland semi and a 2018 flat have very different problems.

Why the area page matters

Heating systems fail along lines you can predict from the housing. A 1930s Metroland semi in Harrow was probably centrally heated in the 1970s, often in microbore, and a good number still run that original pipework under a much newer boiler. A flat off the stadium in Wembley is a sealed system under fifteen years old where a cold radiator is almost never sludge. Watford sits in a hard water area, where scale and sludge look alike but need different treatment.

So each area page says something true and specific about the systems there, rather than the same paragraph with the town name swapped. If that is not useful to you, the diagnostic checklist applies anywhere.

How the areas are organised

The four London pages — north, south, east and west — sit under London and each lists the boroughs and towns beneath it. Essex and Hertfordshire work the same way. If your town is not named, start with the regional page covering it.

Not listed?

These are the areas where we have engineers covering the work. If you're just outside, send the enquiry anyway — coverage extends beyond the named towns, and we'll tell you straight if we can't help rather than sitting on it.

Get an honest answer on what your system needs

Tell us the symptoms. We'll pass it to a Gas Safe engineer covering your area who can tell you whether you need a flush — including if the answer is no.