Sibelga Gas Connection for a New Boiler in Brussels: The Steps to Take Before Commissioning

Why the Sibelga network connection also matters for your boiler project

In Brussels, the natural gas distribution network is managed by Sibelga, the regional network operator. Whether you are building a new home, renovating a property that has never been connected to gas, or replacing an old boiler with a more powerful model, the question of connection or the adequacy of the existing meter almost always arises.

Many homeowners mistakenly believe that installing a new boiler is simply a matter of having their heating engineer carry out the work at home. In most cases this is true: if the property already has an active gas connection and a meter suited to the required output, no application to Sibelga is needed before commissioning. However, in certain situations - no connection, an undersized meter, a very old connection, or a gas supply that has been cut off for several years - it is essential to go through Sibelga before our team can switch on the installation.

Planning for this step in advance avoids weeks of delay on a project, especially when the boiler has already been ordered or the plumbing and flue work has already been completed.

When is an application to Sibelga required?

Several situations trigger action by the network operator before our team can carry out commissioning:

• Property never connected to gas: a new build, an extension, or a property historically heated with heating oil or electricity that wants to switch to natural gas. In this case, a new connection must be requested, which involves laying a pipe from the street main to the meter.
• No meter, or meter removed: if the gas has been cut off and the meter removed for a long time (vacant property, major renovation), a new meter must be installed.
• Insufficient capacity: a high-output boiler, for example for an apartment building or a building with substantial domestic hot water production, may require a differently sized meter or connection.
• Very old or non-compliant installation: some connections dating back several decades no longer meet current standards and must be inspected, or even replaced, before the supply can be restored.

In all other cases - a standard replacement of a boiler with a model of comparable output, on an existing and functioning connection - an application to Sibelga is generally not required, and we can go straight ahead and schedule the installation and commissioning.

The order of steps to follow

To avoid unpleasant surprises, it is worth understanding the full timeline of a project that requires a connection or intervention by Sibelga.

1. Preliminary assessment with your heating engineer

Before ordering any equipment, we recommend having the existing situation assessed: whether a connection is in place, the condition of the meter, and the available capacity compared to the needs of the new appliance. This step makes it possible to know immediately whether an application to Sibelga will be necessary, and therefore to factor this timeframe into the overall project schedule.

2. Submitting the application to Sibelga

If a connection or adaptation is needed, the application must be submitted directly to Sibelga, via their website or customer service. This application specifies the address, the nature of the work required (new connection, change in capacity, meter replacement) and the applicant's details.

Sibelga then assesses the technical feasibility, which depends in particular on the proximity of the distribution main, the accessibility of the building and the layout of the street. A quote is generally provided before any work is carried out on site.

3. Visit from the network technician

Once the application has been approved, a Sibelga technician (or a company appointed by Sibelga) carries out the connection work itself: laying the outdoor pipe, installing or replacing the meter, and connecting it through to the delivery point in the building. This is a separate step from installing the boiler itself: Sibelga deals with the network and the metering, while our team handles everything downstream of the meter.

The time required for this work varies considerably depending on the complexity of any street works involved. It is therefore best to submit the application as early as possible in the project, ideally as soon as the decision to install a gas boiler is made, rather than waiting until the equipment has already been delivered.

4. Installation of the boiler by our team

While the Sibelga application is being processed, or once the connection has been completed, we carry out the installation of the boiler: connecting it to the indoor gas network, the flue, the heating circuit and, where applicable, the domestic hot water circuit. This installation must comply with current standards, particularly regarding room ventilation and the evacuation of combustion products.

5. Inspection of the indoor installation

Before the gas supply is switched on, the indoor installation must be inspected by an approved body, in accordance with Brussels regulations. This inspection checks the tightness of the pipework, the compliance of the connections and adherence to safety rules. This inspection, which covers the indoor installation, should not be confused with Sibelga's intervention, which covers the distribution network and the meter.

6. Commissioning

Once the connection has been completed by Sibelga and the indoor installation inspection has been approved, our team carries out the commissioning of the boiler: the first ignition, combustion adjustments, checking of parameters and practical explanations for day-to-day use. Only at this stage can the appliance operate normally.

Timelines to plan for to avoid unpleasant surprises

The point most often underestimated in a new gas boiler project is the time needed between submitting the application to Sibelga and the connection actually being carried out. This timeframe depends on several factors: the nature of the work (a simple meter replacement or laying a complete new pipe), whether or not street works are required, and the network operator's workload at the time of the application.

For a project starting from scratch, such as a new build, we recommend submitting the gas connection application several months before the desired commissioning date, particularly if works on the public road are required. For a simple meter replacement or a capacity adjustment on an existing connection, timelines are generally shorter, but remain variable.

When we get involved from the project planning stage, our advice is to coordinate the schedule with the client: ordering the boiler, planning our intervention and submitting the Sibelga application in an order that takes these respective timeframes into account, rather than waiting until everything is ready on the installation side only to realise that a connection is still needed.

Who does what: dividing up responsibilities

To clarify everyone's role in this type of project:

• Sibelga manages the public distribution network, the connection from the street main, the installation and maintenance of the meter, and turning on the gas supply through to the delivery point.
• The approved inspection body checks the compliance of the indoor installation before the gas is switched on, in accordance with the safety requirements in force in the Brussels Region.
• DPS Chauffagiste handles everything relating to the installation itself: choosing and fitting the boiler, connecting it to the heating circuit and flue, adjustments, commissioning and supporting the client with the day-to-day use and future maintenance of their appliance.

This clear division of roles helps avoid misunderstandings about who needs to take which steps, and at what point in the project.

And after commissioning?

Once the boiler has been installed and commissioned, periodic servicing remains compulsory for gas appliances, in accordance with Brussels regulations on heating installation safety. This regular servicing checks that the appliance is working properly, that combustion quality is good, and that there is no risk of carbon monoxide. We recommend scheduling this first service within the first year of operation, and then following the frequency set out in the applicable regulations.

In summary

Connecting to the Sibelga network is not systematically required when installing a new boiler in Brussels, but when it is needed, it directly determines the commissioning date. Identifying this need as early as possible in the project, submitting the application without delay, and coordinating the various steps - connection, inspection of the indoor installation, then commissioning - helps avoid delays that can easily run into weeks, or even months, on certain projects.

If you are considering installing a new gas boiler in Brussels, do not hesitate to contact us ahead of your project: we can assess with you whether an application to Sibelga is needed and help you organise the schedule, from the connection application through to the commissioning of your installation.