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RGII Certificate of Compliance (CERT 2)

An RGII CERT 2 is the Irish Declaration of Conformance for a boiler replacement on an existing gas installation that already has a meter fitted, issued under I.S. 813. It records the removal of the old boiler and the installation and commissioning of the new one — including flue gas analysis, tightness test, and the safe-to-use status of the appliance. It is issued by an RGII-registered installer whenever a domestic gas boiler is replaced in Ireland.

I.S. 813:2025 (Domestic gas installations, Edition 4); Energy (Miscellaneous Provisions) Act 2006Valid: Issued per boiler replacement (does not expire)

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Sample RGII CERT 2 certificate

Sample RGII Certificate of Compliance (CERT 2) certificate created with CertBox, showing the professional PDF layout with property and customer details with gprn and eircode, details of the replacement boiler / appliance (type, make, model, flue type), work carried out and parts replaced

Sample RGII CERT 2 with fictional data. All personal details shown are fake.

What it covers

  • Property and customer details with GPRN and Eircode
  • Details of the replacement boiler / appliance (type, make, model, flue type)
  • Work carried out and parts replaced
  • Commissioning data: gas rate, burner pressure, heat input
  • Flue gas analysis (CO, CO2, CO/CO2 ratio)
  • Tightness test, ventilation and flue-flow checks, CO alarm status
  • Safe-to-use status and any Notice of Hazard issued
  • RGII registration number and installer declaration

Who needs a RGII CERT 2?

Homeowners replacing a gas boiler
Landlords upgrading rental heating
Boiler warranty holders (new boiler)
Property managers

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Frequently asked questions about RGII CERT 2

What is an RGII CERT 2 used for?
A CERT 2 is the Declaration of Conformance issued when a gas boiler is replaced on an existing metered installation in Ireland. It records the commissioning of the new boiler (including flue gas analysis) and confirms the installation is safe to use. New installations needing a new meter use a CERT 1; servicing, repairs and other appliance work use a CERT 3.
What is the difference between a CERT 1, CERT 2 and CERT 3?
CERT 1 is for a new installation or work requiring a new meter/connection. CERT 2 is specifically for a boiler replacement on an existing metered installation. CERT 3 covers all other works on an existing installation — new appliance fits (except boilers), pipework, repairs, safety checks and servicing.
Who can issue a CERT 2 in Ireland?
Only an RGII-registered gas installer can replace a gas boiler and issue a CERT 2. The installer's RGI registration number must appear on the certificate. You can verify a contractor at rgii.ie.

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