Unvented Cylinder Services in Canterbury (G3 Qualified Engineer)
Fast diagnosis • G3 Certified • Unvented Specialists
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Unvented hot water cylinders provide powerful mains pressure hot water, but they must be installed, serviced and repaired by a qualified engineer in line with Building Regulations Part G3.
At Canterbury Heating & Cooling, we specialise in unvented cylinder servicing, repairs, certification and replacement, ensuring your system remains safe, compliant and operating efficiently.
Our Unvented Cylinder Services
We provide a complete range of G3 unvented services:
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Annual servicing & safety checks
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Fault finding and repairs
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PRV, expansion vessel and safety valve replacement
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Cylinder replacement and upgrades
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Discharge pipework (D1/D2) compliance corrections
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G3 safety inspections for landlords and homeowners
Unvented Cylinder Repairs (G3 Qualified)
Unvented cylinders contain multiple safety devices that can fail over time. We diagnose and repair all common faults, including:
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PRV replacement
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Expansion vessel recharge or replacement
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T&P valve faults
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Thermostat and overheat cut-out issues
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Pressure faults and tundish discharge
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Leak diagnosis
We carry common parts and aim to resolve most faults in a single visit.
Annual Servicing (G3 Compliant)
Unvented hot water cylinders operate under mains pressure and must be installed and maintained in accordance with Building Regulations Part G3. Annual servicing by a G3 qualified engineer helps ensure:
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Safety valves operate correctly
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Expansion vessels are correctly pressurised
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Thermostats and overheat protection devices function safely
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Discharge pipework remains compliant
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Manufacturer warranty conditions are met
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Home insurance requirements for maintained systems are satisfied
Regular servicing reduces the risk of leaks, pressure faults and costly breakdowns — while ensuring your system remains safe and compliant.
Combined Heat Pump + Cylinder Service Packages Available
G3 Certification, Legislation & Compliance
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Unvented hot water cylinders are governed by Building Regulations Part G3, meaning:
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Only G3 qualified engineers can install or work on them
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Systems must include correctly installed safety devices
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Discharge pipework must meet strict sizing and routing standards
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We provide:
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G3 compliance checks
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Safety inspections for property sales
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Advice on non-compliant installations
Home Insurance & Safety Requirements
Many homeowners are unaware that:
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Unvented cylinders must be properly maintained
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Lack of servicing can affect insurance claims
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Faulty safety devices can lead to serious damage or risk
Regular servicing provides:
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Documented maintenance history
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Reduced risk of leaks and pressure faults
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Peace of mind your system is safe
Cylinder Replacement & Upgrades
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Sometimes repair isn’t the best option.
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We offer:
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Like-for-like cylinder replacement
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Upgrades to higher capacity systems
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Modern high-efficiency cylinders
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Full G3 certification on completion
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We’ll always advise whether repair or replacement is the most cost-effective option.