Powerful, reliable hot water — cylinders installed and serviced.
An unvented cylinder gives mains-pressure hot water to every tap and shower in the house. Stewart is G3 qualified (a legal requirement for unvented work) and installs Megaflo, Telford and Gledhill systems — plus services and repairs your existing cylinder.
Mains pressure everywhere
Multiple showers running at full pressure.
G3 qualified
Legally required certification for unvented cylinders.
Annual service
Expansion vessel, PRV, T&P valve and immersion checked.
Repairs & swaps
Leaking coils, failed immersions, tundish drips fixed.
Vented vs unvented — which is right?
Older houses with a loft tank use a vented cylinder — cheap to run, but weak shower pressure without a pump. An unvented cylinder connects straight to the mains, giving strong hot water everywhere and freeing up loft space. Ideal when you convert the loft or add an en-suite.
Servicing
Unvented cylinders are legally required to be serviced annually. Stewart checks the expansion vessel charge, tests the temperature & pressure relief valve, cleans the strainer and confirms the safety discharge is correct.
Local coverage
Personally delivered by Stewart Hardy across Addlestone, Weybridge, Chertsey, Ottershaw, New Haw, Woodham, Byfleet, West Byfleet, Shepperton, Walton-on-Thames, Woking, Egham, Virginia Water, Sunbury-on-Thames and surrounding Surrey villages within 15 miles of Addlestone.