Unvented Cylinders
An unvented hot water cylinder is a sealed pressurised system that stores and delivers hot water directly from the mains supply, without the need for a cold water tank in the loft. Touch Of Heat installs, services and repairs unvented cylinders, treating this work as a core part of our heating offer rather than an afterthought.
How Unvented Cylinders Work and Why They Are Popular in London
Unlike a traditional cylinder, which relies on a gravity-fed cold water tank stored above it, an unvented cylinder connects directly to the main cold water supply. Water is heated either by an immersion heater or by a boiler and stored under pressure until it is needed.
When a tap or shower is opened, hot water is delivered at mains pressure, which typically results in a much stronger, more consistent flow than a gravity-fed system can provide.
In London, unvented cylinders are particularly common in flats and properties where there is no loft space for a cold water tank, or in homes that have no gas supply and rely on electric heating and hot water.
They are also a popular choice in properties where a powerful shower is a priority, as the pressurised supply makes a significant difference to performance compared to a low-pressure vented system.
Installation of Unvented Cylinders
Fitting an unvented cylinder is specialist work that must be carried out by a qualified engineer holding the relevant G3 Unvented Hot Water qualification. This is not a standard plumbing job, and it is a legal requirement that the installation be completed by someone with the appropriate certification.
All Touch Of Heat engineers who carry out unvented cylinder installations hold the G3 qualification, ensuring every fitting is safe, compliant and backed by the manufacturer’s warranty.
We assess your property and hot water demand before recommending the right cylinder size and specification for your needs. Correct sizing is important. A cylinder that is too small will struggle to meet demand during peak usage, while one that is significantly oversized will take longer to heat and cost more to run. Our engineers select the right unit for your property and fit it to the highest standard, with all safety devices correctly configured and tested.
Servicing and Repairs
Like any pressurised system, an unvented cylinder requires regular servicing to remain safe and efficient. Annual servicing involves checking and replacing key safety components, including the pressure relief valve and expansion vessel, inspecting connections and checking that the system is operating within safe pressure limits. Servicing also helps to identify any early signs of component wear before they lead to a failure or a safety issue.
Touch Of Heat also carries out repairs to unvented cylinders when faults develop. Common issues include a faulty pressure relief valve discharging water, a failed immersion heater element, loss of pressure or a failed thermostat. Our engineers diagnose the problem accurately and carry out repairs using quality components to restore your hot water supply as quickly as possible.
Enquire About Unvented Cylinder Services with Touch Of Heat
Whether you need a new unvented cylinder fitted, your existing cylinder serviced, or a repair carried out, Touch Of Heat has the qualifications and experience to help.
Contact Touch Of Heat today for a no-obligation quote and straightforward advice on the best solution for your property.
