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Unvented Cylinder Installation Certificate

The Irish Unvented Cylinder Installation Certificate documents the installation and commissioning of an unvented hot water storage system in Ireland, confirming compliance with IS 813 and manufacturer requirements. Unvented systems operate under mains pressure and include mandatory safety devices — pressure relief valve, temperature and pressure relief valve, expansion vessel, and tundish — all of which must be fitted and tested. Only suitably trained and registered plumbers should install unvented systems.

IS 813:2002+A1:2010, Building Regulations Part H (Ireland), manufacturer commissioning standardsValid: No fixed expiry — attached to the installation

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Sample Unvented Cylinder Certificate certificate

Sample Unvented Cylinder Installation Certificate certificate created with CertBox, showing the professional PDF layout with cylinder make, model, serial number, capacity, and type (direct/indirect), safety devices: pressure relief valve, t&p relief valve, expansion vessel, and tundish, discharge pipe routing confirmation

Sample Unvented Cylinder Certificate with fictional data. All personal details shown are fake.

What it covers

  • Cylinder make, model, serial number, capacity, and type (direct/indirect)
  • Safety devices: pressure relief valve, T&P relief valve, expansion vessel, and tundish
  • Discharge pipe routing confirmation
  • Water supply pressure and flow rate measurements
  • Thermostat set temperature (minimum 60°C)
  • Safety valve operation test result
  • Plumber registration number and signature

Who needs a Unvented Cylinder Certificate?

Registered plumbers installing unvented cylinders
Homeowners upgrading from vented to unvented systems
Developers installing mains-pressure hot water in new builds
Landlords with mains-pressure cylinder systems

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Frequently asked questions about Unvented Cylinder Certificate

Why does an unvented cylinder need a certificate in Ireland?
Unvented hot water systems operate at mains pressure and carry a risk of explosion if safety devices fail. The installation certificate confirms that all mandatory safety devices are correctly fitted and tested, and that the system meets IS 813 and Building Regulations Part H. It protects the homeowner and demonstrates competence.
Can any plumber install an unvented cylinder in Ireland?
No. Plumbers must hold specific training and competency for unvented hot water systems. Some manufacturers also require their approved installer schemes to maintain warranty. Always check that your plumber is qualified and registered before commissioning this work.
What temperature should an unvented cylinder be set to?
The thermostat should be set to a minimum of 60°C to prevent Legionella bacteria growth. The certificate records the set temperature as part of the commissioning checks.

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