Installed by Gas Safe and G3 certified engineers, fully compliant with current regulations
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Supplied, installed, and fully commissioned by G3-certified engineers
Answer a few questions about your property
Our team will check the information provided.
Once confirmed, we will install your new cylinder
Certified Engineers
An unvented cylinder installation delivers mains-pressure hot water to every tap and shower in your home with no loft tank required. At Master Gas London, every installation is carried out by G3 certified engineers, fully compliant with Building Regulations, across London, Essex, and Hertfordshire.
By law, unvented cylinders must be installed by a qualified G3 engineer. Choosing an uncertified installer invalidates your warranty and puts your household at risk. With Master Gas London, the work is done correctly, safely, and to your manufacturer’s exact requirements.
Barking and Dagenham
Barnet
Bexley
Brent
Bromley
Camden
Croydon
Ealing
Enfield
Greenwich
Hackney
Hammersmith and Fulham
Haringey
Harrow
Havering
Hillingdon
Hounslow
Islington
Kensington and Chelsea
Kingston upon Thames
Lambeth
Lewisham
Merton
Newham
Redbridge
Richmond upon Thames
Southwark
Sutton
Tower Hamlets
Waltham Forest
Wandsworth
Westminster
Basildon
Braintree
Brentwood
Castle Point
Chelmsford
Colchester
Epping Forest
Harlow
Maldon
Rochford
Southend-on-Sea
Tendring
Thurrock
Uttlesford
Broxbourne
Dacorum
East Hertfordshire
Hertsmere
North Hertfordshire
St Albans
Stevenage
Three Rivers
Watford
Welwyn Hatfield
Yes, it’s a legal requirement under Part G of the Building Regulations. Installing an unvented cylinder without a qualified G3 engineer is illegal and will void your product warranty. Every Master Gas London engineer who carries out this work holds current G3 certification.
Most installations are completed within a single day, typically four to eight hours. If additional pipework or system modifications are needed, your engineer will advise you on timing before any work begins.
A direct cylinder is heated by an electric immersion heater. An indirect cylinder is heated by your boiler with an immersion heater as backup, making it the more efficient choice for homes with a gas boiler. Our team will recommend the right option for your property during the quote process.
Yes, significantly. Unvented cylinders connect directly to the mains, delivering consistent high pressure to every outlet in your home. Homes previously on a gravity fed vented system typically notice the biggest improvement.
We cover London, Essex, and Hertfordshire. Use the quote tool on this page to get started and we’ll confirm availability for your area.
