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Heating System Commissioning Certificate

The Irish Heating System Commissioning Certificate is issued upon the installation and commissioning of a central heating system in Ireland — covering gas boilers, oil boilers, heat pumps, and electric systems. It records the system flush, inhibitor addition, filter installation, TRV fitting, programmer configuration, and measured flow and return temperatures. The certificate demonstrates that the system has been commissioned in accordance with Irish standards and manufacturer instructions, which is commonly required by manufacturers to validate product warranties.

Irish Building Regulations Part L (Conservation of Fuel and Energy), manufacturer commissioning requirements, CIBSE guidanceValid: No fixed expiry — attached to the installation

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Sample Heating Commissioning Certificate certificate

Sample Heating System Commissioning Certificate certificate created with CertBox, showing the professional PDF layout with heating type (gas, oil, heat pump, electric) and system type (sealed / open vented), boiler make, model, serial number, and output (kw), system flush and inhibitor treatment with inhibitor type

Sample Heating Commissioning Certificate with fictional data. All personal details shown are fake.

What it covers

  • Heating type (gas, oil, heat pump, electric) and system type (sealed / open vented)
  • Boiler make, model, serial number, and output (kW)
  • System flush and inhibitor treatment with inhibitor type
  • Magnetic filter fitment and TRV installation
  • Programmer / timer and room thermostat commissioning
  • Measured flow and return temperatures
  • System pressure before and after commissioning

Who needs a Heating Commissioning Certificate?

Heating engineers and plumbers installing new systems
Homeowners with new boiler or heating installations
Developers fitting heating in new builds
Landlords installing new heating systems

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Frequently asked questions about Heating Commissioning Certificate

Does a new boiler in Ireland need a commissioning certificate?
Yes. Most boiler manufacturers — including Worcester Bosch, Vaillant, Baxi, and Ideal — require a commissioning certificate to be completed and retained to validate the warranty. Without evidence of proper commissioning, a warranty claim may be refused.
What is system flushing and why does it matter?
System flushing removes installation debris, flux residues, and existing sludge from the pipework and radiators before commissioning. If not carried out, contamination can damage the boiler heat exchanger and circulating pump, leading to premature failure and voiding the warranty.
What inhibitor should be added to a heating system?
Products such as Fernox F1, Sentinel X100, or equivalent BSRIA-approved inhibitors are commonly used in Ireland. The commissioning certificate records the inhibitor type so the correct product is used on future maintenance visits.

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