Installed by Gas Safe and G3 certified engineers, fully compliant with current regulations
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Suitable for 1-2 bedroom properties with 1 bathroom
Suitable for 2 bedroom properties with 1 bathroom
Suitable for 3 bedroom properties with 1-2 bathrooms
Suitable for 4-5 bedroom properties with 2 bathrooms
Suitable for 5+ bedroom properties with 2+ bathrooms
A direct unvented cylinder heats water using an electric immersion heater, making it the ideal solution for properties without a gas supply or where a boiler connection isn’t practical. Connected directly to the mains, it delivers consistent high pressure hot water throughout your home with no need for a cold water tank in the loft.
At Master Gas London, every direct unvented cylinder is supplied, installed, and fully commissioned by Gas Safe and G3 certified engineers across London, Essex, and Hertfordshire. All prices shown on this page are fixed and inclusive of installation. No hidden costs, no surprises.
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
A direct unvented cylinder heats and stores water using an electric immersion heater connected directly to your mains supply. Because there is no need for a cold water tank or a boiler connection, it works well in properties without gas or where a boiler fed system is not practical.
It depends on your property. If you have a gas boiler, an indirect cylinder is generally the more efficient and cost effective choice as it uses your boiler to heat the water. A direct cylinder is better suited to all electric properties or homes where running pipework to a boiler is not feasible.
Direct cylinders rely entirely on electricity to heat water, which typically costs more to run than a gas boiler fed indirect cylinder. However, if your property uses a heat pump or solar thermal panels, a direct cylinder can be an efficient and cost effective solution as it works well with renewable energy sources.
Yes, and it’s one of the key advantages of a direct cylinder. Because it uses an electric immersion heater rather than a boiler, it can be paired with solar thermal panels or a heat pump to heat water using renewable energy. For properties moving away from gas, a direct unvented cylinder is often the most practical long term solution.
Most direct unvented cylinders include a dual immersion heater setup, meaning a backup element is already in place if the primary heater develops a fault. This keeps your hot water supply running while a repair is arranged. Master Gas London carries out immersion heater repairs and replacements across London, Essex, and Hertfordshire.
