Unvented Cylinder Repairs Across Bedfordshire, Hertfordshire, Buckinghamshire and North London
Unvented cylinders need a G3 qualified engineer to repair them safely. Our qualified plumbers repair unvented hot water cylinders across Bedfordshire, Hertfordshire, Buckinghamshire and North London.
Unvented Cylinder Faults We Repair
G3 qualified diagnosis and repair of all unvented cylinder faults.
Discharge Pipe Dripping
Water dripping from the safety discharge pipe outside. Usually caused by a failing pressure reducing valve, a lost expansion vessel charge or a faulty temperature and pressure relief valve.
No Hot Water
Unvented cylinder full of cold water but not heating. Can be caused by a failed immersion heater, a faulty motorised valve, a boiler fault or a tripped safety cut out thermostat.
Poor Hot Water Flow
Weak flow from hot taps despite mains pressure cold supply. Often caused by a blocked inlet filter, a failing pressure reducing valve or a scaled outlet connection.
Water Too Hot
Dangerously hot water coming from taps. Usually a failed control thermostat allowing the cylinder to overheat. The safety cut out should have tripped. Needs immediate repair.
Expansion Vessel Failure
The expansion vessel has lost its air charge causing the pressure relief valve to discharge. We recharge or replace the expansion vessel and reset the safety valve.
Banging or Vibrating
Noise from the cylinder often caused by a loose heating coil, failing motorised valve or pressure reducing valve vibrating. We trace the source of the noise and repair it.
What Our Unvented Cylinder Repairs Include
Why Choose Us for Unvented Cylinder Repairs
G3 Qualified
Only G3 qualified engineers should work on unvented cylinders. Our engineers hold this qualification and understand the safety requirements.
Safety First
Unvented cylinders store hot water under pressure. We check all safety devices as part of every repair. We never bypass or disable safety features.
Same Day Repair
We aim to repair your unvented cylinder on the first visit. We carry common parts including pressure reducing valves, expansion vessels and thermostats.
Local Across Four Counties
Our G3 qualified engineers cover Bedfordshire, Hertfordshire, Buckinghamshire and North London.
Unvented Cylinder Repairs Near You
Our G3 qualified engineers cover homes across four counties.
Unvented Cylinder Repair FAQs
Common questions about unvented cylinder repairs
Why is water dripping from the pipe outside?
The pipe outside is the safety discharge pipe. Water dripping from it means one of the safety devices has operated. Common causes are a failed pressure reducing valve, a lost expansion vessel charge or a faulty temperature relief valve. This needs a G3 qualified engineer to diagnose.
Can any plumber repair an unvented cylinder?
No. By law only engineers holding the G3 qualification for unvented hot water systems can work on unvented cylinders. Our engineers are G3 qualified and your repair will be safe and compliant.
How often should an unvented cylinder be serviced?
Unvented cylinders should be serviced annually. The service checks the expansion vessel charge, pressure reducing valve, temperature relief valve, pressure relief valve and discharge pipework. It also checks the thermostat and immersion heater.
Is it dangerous if the discharge pipe is dripping?
A dripping discharge pipe indicates a fault which needs attention but the safety devices are doing their job of safely releasing excess pressure or temperature. Do not try to block or cap the discharge pipe. Call us to diagnose and repair the cause.
What is the expansion vessel and why does it fail?
The expansion vessel absorbs the expansion of hot water inside the cylinder. It contains a rubber diaphragm with an air charge behind it. Over time the air charge can be lost and the diaphragm can fail. We check and recharge or replace the vessel as needed.
How long do unvented cylinders last?
Well maintained unvented cylinders typically last 15 to 20 years. The cylinder body itself is stainless steel and resists corrosion. The external components like pressure reducing valves and expansion vessels may need replacement during the cylinder's life.
Unvented Cylinder Repair Enquiry
Tell us what is wrong with your unvented cylinder and we will repair it safely.
Discharge pipe dripping? Call 0330 043 3748