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Boiler commissioning checklist
An installation and commissioning record for a gas boiler. Scan the data plate, record the flue and terminal position, the gas tightness test, working inlet pressure and gas rate, and combustion readings at maximum and minimum rate. Record the system clean, inhibitor and filter, the controls, the carbon monoxide alarm, the Gas Safe notification reference, the Benchmark checklist, the customer demonstration and the warranty registration. Every question is listed below, and you can fill the live form in on this page.
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Who gives you a boiler installation certificate?
The Gas Safe registered business that installed the boiler notifies building control through the competent person scheme, and the homeowner then receives a Building Regulations compliance certificate. GOV.UK says a scheme installer gives the certificate within 8 weeks of completion. The installer also completes the Benchmark commissioning checklist, which Benchmark says is a means of meeting the commissioning requirements of Part L.
Last updated . Facts checked by the SiteSurvey team on 17 October 2026 against Benchmark (HHIC): what is Benchmark, Benchmark (HHIC): do I need Benchmark, GOV.UK: building regulations approval, use a competent person scheme and Approved Document J (2022), paragraph 3.43: carbon monoxide alarms for gas appliances.
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Every question in the boiler commissioning template
A gas boiler installation and commissioning record: boiler and flue, gas pressure and rate, tightness, combustion at maximum and minimum rate, system cleaning and inhibitor, controls, CO alarm, Gas Safe notification and Benchmark. 4 sections and 56 questions. Follow-up questions and guidance appear only when an answer calls for them, so the person on site never sees the ones that do not apply.
Make it your own: every question is editable
This is a starting point, not a fixed form. Once it is in your SiteSurvey account you can reword any question, add or remove questions, sections and answer options, and add your own logo, so it fits the way your team works and the jobs you do.
Details you only enter once
Add this form to a project in SiteSurvey and it fills in what the project already knows, so nobody on site retypes it and every form on the job uses the same names. Anything filled in can still be changed.
- Project: the project name
- Client: the project's customer
- Site: the site, when the form is opened for a space or a product
- Site address: the site address, from the space or the project
Boiler
- ProjectShort answerFills in from the project name
- ClientShort answerFills in from the project's customer
- Site*Short answerFills in from the site, when the form is opened for a space or a product
- Site addressShort answerFills in from the site address, from the space or the project
- Date commissioned*Date
- TimeTime
- Engineer name*Short answer
- Gas Safe registration number (business)*Short answer
- Engineer licence numberShort answer
- Boiler make and model*Short answer
- Scan the data plateScan a label: serial number, gc number
Optional. Scan the label or tag to capture its numbers.
- TypeChoose one
- Combi
- System
- Regular (heat only)
- LocationShort answer
- CheckGas work must be done by a Gas Safe registered engineer under the Gas Safety (Installation and Use) Regulations 1998; regulation 26 requires the installer to check the flue, the combustion air supply, the operating pressure or heat input and the safe operation of the appliance before leaving it. Domestic boilers are installed to BS 6798 and the manufacturer instructions, and combustion is measured with an analyser used to BS 7967.
- CheckThis is a site record of the commissioning. It supports the Benchmark commissioning checklist and the building regulations notification made through Gas Safe Register; it is not the Benchmark checklist, the Building Regulations compliance certificate or a gas safety record.
Gas, flue and combustion
- Flue typeChoose one
- Horizontal balanced
- Vertical balanced
- Plume management kit
- Other
- Flue terminal position meets the manufacturer's clearances?Yes or No
- Smallest distance from the flue terminal to an opening window, door or air brick (m)Number
Measure from a photo taken square on to the wall, using a door or window of known size as the reference. It is an estimate; anywhere near the minimum, check with a tape.
Shown when “Flue type” is answered - Minimum for that opening in the manufacturer's instructions (m)NumberShown when “Flue type” is answered
- Terminal distance against the instructionsWorked out by the formShown when “Smallest distance from the flue terminal to an opening window, door or air brick (m)” is answered and “Minimum for that opening in the manufacturer's instructions (m)” is answered
- Gas tightness test*Choose one
- Pass
- Fail
- Working inlet pressure (mbar)Number
- Minimum working inlet pressure in the manufacturer's instructions (mbar)Number
- Inlet pressure against the instructionsWorked out by the formShown when “Working inlet pressure (mbar)” is answered and “Minimum working inlet pressure in the manufacturer's instructions (mbar)” is answered
- Gas rate measured (m³/h or kW)Number
- CO at maximum rate (ppm)Number
- CO/CO2 ratio at maximum rateNumber
- CO at minimum rate (ppm)Number
- CO/CO2 ratio at minimum rateNumber
- Highest CO allowed in the manufacturer's instructions (ppm)Number
- Highest CO/CO2 ratio allowed in the manufacturer's instructionsNumber
- At maximum rateWorked out by the formShown when “CO at maximum rate (ppm)” is answered and “CO/CO2 ratio at maximum rate” is answered and “Highest CO allowed in the manufacturer's instructions (ppm)” is answered and “Highest CO/CO2 ratio allowed in the manufacturer's instructions” is answered
- At minimum rateWorked out by the formShown when “CO at minimum rate (ppm)” is answered and “CO/CO2 ratio at minimum rate” is answered and “Highest CO allowed in the manufacturer's instructions (ppm)” is answered and “Highest CO/CO2 ratio allowed in the manufacturer's instructions” is answered
- WarningA combustion reading is over the manufacturer's limit. Investigate as the manufacturer's instructions say before the boiler is handed over, and follow the gas industry unsafe situations procedure where it applies.Shown only when the answers above make it relevant
- GuidanceCombustion readings are compared with the limits in the manufacturer's instructions, and recorded on the Benchmark commissioning checklist.
- Condensate pipe run and terminated correctly?Yes or No
- Results needing attentionWorked out by the form
Counts a failed tightness test, inlet pressure below the minimum, combustion over a limit at either rate, a terminal too close to an opening or outside the clearances, and condensate not run correctly.
- CheckA result needs attention. Record what was put right before handover in the photos and notes, or why the boiler was not left in use.Shown only when the answers above make it relevant
System and controls
- System cleaned and flushed?Yes or No
- Inhibitor added?Yes or No
- System filter fitted?Yes or No
- Controls fittedTick all that apply
- Programmer or timer
- Room thermostat
- Thermostatic radiator valves
- Weather compensation
- Smart thermostat
- Other (describe)
- Hot water outlet temperature (°C)Number
- Carbon monoxide alarm fitted in the room with the boiler?Yes or No
- WarningApproved Document J (England), paragraph 3.43: where a new or replacement fixed gas appliance, other than one used only for cooking, is installed in a home, a carbon monoxide alarm should be provided in the room where it is located.Shown when “Carbon monoxide alarm fitted in the room with the boiler?” is No
Notification and handover
- Gas Safe building regulations notification referenceShort answer
- GuidanceBenchmark: every installation must be notified to building control, directly or through a competent person scheme such as Gas Safe Register, and a Building Regulations compliance certificate is then issued to the homeowner. GOV.UK says a scheme installer gives the certificate within 8 weeks of completion.
- Benchmark commissioning checklist completed?Yes or No
- Customer shown how to use the boiler and controls, and asked to sign the Benchmark checklist?Yes or No
- Warranty registered with the manufacturer?Yes or No
- CheckWarranty terms are set by each manufacturer and can include a deadline for registration. Check the manufacturer's terms.Shown when “Warranty registered with the manufacturer?” is No
- Photos of the boiler, flue and controlsPhotos
- Defects and actionsRepeat for each action. Each one asks:
- Action needed*Notes
- PriorityChoose one
- Urgent
- High
- Medium
- Low
- OwnerShort answer
- Due dateDate
- StatusChoose one
- Open
- In progress
- Completed
- PhotosPhotos
- First service dueDate
Usually 12 months after commissioning. Check the manufacturer instructions and warranty terms.
- Days to first serviceWorked out by the formShown when “Date commissioned” is answered and “First service due” is answered
- CheckThe next due date is before the date of this record. Check the date entered.Shown only when the answers above make it relevant
- Customer nameShort answer
- Customer signatureSignature
- Installer name*Short answer
- Installer signatureSignature
See it filled in
A completed boiler commissioning report, made by SiteSurvey from a fictional site visit: every answer, the photos, the guidance that applied and the sign-off, ready to send as a PDF.
Boiler commissioning FAQs
What combustion readings are taken?
The form records CO and the CO/CO2 ratio at maximum and minimum rate. Compare them with the limits in the manufacturer's instructions and record them on the Benchmark commissioning checklist.
Who notifies the installation?
Benchmark says every installation must be notified to building control, directly or through a competent person scheme such as Gas Safe Register, and a Building Regulations compliance certificate is then issued to the homeowner. The form records the notification reference.
Does a new boiler need a carbon monoxide alarm?
In England, Approved Document J (paragraph 3.43) says that where a new or replacement fixed gas appliance, other than one used only for cooking, is installed in a home, a carbon monoxide alarm should be provided in the room where it is located. The form asks and warns if there is none.
Does the warranty need registering?
Warranty terms are set by each manufacturer. Benchmark says installers must install, commission and service in line with the Benchmark checklist for warranty purposes. The form records whether the Benchmark checklist was completed and the warranty registered.
Is this the Benchmark checklist?
No. It is your own site record, with photos and signatures, that sits alongside the Benchmark checklist. The form asks whether Benchmark was completed and whether the customer was shown how to use the boiler and controls.
Who uses this?
Gas Safe registered heating engineers and installers, and housing providers replacing boilers.
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Build or update an asset register: each asset with its tag, make, model, serial, position (GPS outside), condition, life and photos, totals by condition and life, and changes to the register.
Inspection round for plant: asset condition, refrigerant and leak checks, pressure vessels, next due dates.
Job sheet for a reactive or planned job: safety before starting, work done, parts used, tests, outcome and customer sign-off.
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