Unvented cylinders are pressurized and directly connected to the mains water supply, providing high-pressure hot water. Vented cylinders, on the other hand, rely on gravity to distribute hot water and are often found in properties with a cold water storage tank.

Common issues include low water pressure, airlocks, or problems with the expansion vessel. Our technicians can diagnose and resolve these issues to ensure optimal unvented cylinder performance.

Regular servicing is recommended annually to detect and address potential issues before they escalate. This proactive approach helps prevent breakdowns and ensures the longevity of your vented cylinder.

While unvented cylinders can be installed in many properties, certain requirements, such as sufficient water pressure, must be met. Our experts can assess your property and recommend the most suitable hot water solution.

Water in the tundish means a safety valve has opened and the system needs a G3 engineer. Lukewarm water usually means the expansion vessel membrane has failed or the internal air bubble has depleted. Scalding water means both thermostats have failed and the relief valve is the only protection left, so switch the cylinder off and call us the same day on 020 3764 2713.

Yes, by law. Building Regulations Part G3 restricts work on unvented cylinders over 15 litres to engineers with a current G3 qualification, and the work is notifiable to Building Control. PH247’s engineers hold the qualification and certify installations through a Competent Person Scheme, so you receive a Building Regulations compliance certificate for the work.