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Unvented Hot Water Storage Vessel Commissioning Record

An Unvented Hot Water Storage Vessel Commissioning Record confirms that an unvented cylinder (such as a Megaflo, Heatrae Sadia, or OSO) has been installed and commissioned by a G3-qualified installer in accordance with Building Regulations Approved Document G3. It records all safety device checks, discharge pipework compliance, and commissioning measurements.

Building Regulations Approved Document G3, BS EN 12897Valid: One-off (per installation)

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Sample Unvented Cylinder Certificate certificate

Sample Unvented Hot Water Storage Vessel Commissioning Record certificate created with CertBox, showing the professional PDF layout with cylinder specification (make, model, capacity, type), safety devices (t&p valve, tundish, discharge pipework), expansion vessel and pressure reducing valve

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

What it covers

  • Cylinder specification (make, model, capacity, type)
  • Safety devices (T&P valve, tundish, discharge pipework)
  • Expansion vessel and pressure reducing valve
  • Temperature controls and thermostat settings
  • Cold water supply and hot water performance measurements
  • Compliance with G3 discharge pipe requirements

Who needs a Unvented Cylinder Certificate?

Homeowners
Landlords
Building Control

Create your Unvented Cylinder Certificate with CertBox

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2

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Professional PDF ready to share via secure link or download.

Frequently asked questions about Unvented Cylinder Certificate

Do I need a G3 qualification to install an unvented cylinder?
Yes. Building Regulations require that unvented hot water storage vessels over 15 litres must be installed by a person who holds a current G3 qualification (or equivalent, such as a manufacturer-specific course).
Does the installation need to be notified to Building Control?
Yes, unless you are registered with a Competent Person Scheme (such as APHC, CIPHE, or SNIPEF) that allows self-certification. If not registered, you must submit a Building Notice to your local authority.
What safety devices are required?
At minimum: a temperature and pressure relief valve (T&P valve), a tundish, discharge pipework to a safe external location, an expansion vessel, a pressure reducing valve, and a line strainer. CertBox checks all of these in the compliance checklist.

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