Boiler installation in Belgium
A new condensing boiler only makes sense once you know whether replacement is needed and which output matches real heat demand. An oversized unit fires briefly and drops out, which raises consumption and stresses components. Van Dijk Home starts from radiator or floor circuit output, not blindly from the old appliance rating.
- Final price given before we start
- Up to 2 years warranty on labour
- Emergency line available 24/7
- Direct phone contact: +32 2 000 00 00
Our approach
Replacing a boiler with measurement and commissioning
On every installation we follow the same order: confirm replacement is needed, size the appliance, prepare and flush, fit, then balance and document with flue gas analysis and pressure guidance.
- 01
Diagnosis and heat demand
We read fault history, pressure and how the existing appliance fires. Together with emitter output from radiators or floor circuits we decide whether repair still makes sense or replacement, and what condensing output is needed without oversizing.
- 02
Position and gas checks
The location is tested against flue, air supply, condensate and the gas connection. If the intended position is not permissible or gas work is needed, that emerges before the appliance is ordered.
- 03
Remove the old boiler and prepare the circuit
The old unit is safely disconnected and removed. The heating circuit is flushed and prepared where needed, with a filter on the return when that protects the new heat exchanger from residue in older pipework.
- 04
Fit and connect the new boiler
The new appliance is mounted and connected to gas, water and electrical controls, with condensate routed correctly to drain or pump. Connections are checked before the circuit is filled again.
- 05
Balance, commission and handover
We vent and hydraulically balance the circuit, set burner and weather curve with flue gas analysis and measure CO in the plant room. You receive the settings, guidance on pressure and, where applicable, the steps for mandatory post-commissioning inspection.
When replacement makes sense
Repair versus replace on a boiler
Not every fault code means an immediate new boiler. Recurring codes, a heat exchanger that keeps leaking after repair, or a burner that will not hold stable combustion after cleaning point more often to replacement. Appliance age helps that decision without open-ended promises.
Oversizing is a quiet driver of high bills: the boiler reaches setpoint quickly and shuts off, causing short cycles. Output matched to measured emitter capacity reduces that behaviour and eases load on pump, expansion vessel and controls.
Circuit problems are sometimes blamed on the boiler. Low pressure, air, a circulation pump that fails to start, or an expansion vessel without charge pressure mimic a faulty appliance. We measure pressure and temperatures before ordering a new unit.
Related work
From servicing to full replacement
A new boiler needs a healthy circuit and regular follow-up. We link the next step to what we measure on site.
Warning signs
When to consider a new boiler
These signs suggest repair alone will not suffice or the appliance is no longer efficient. The earlier we measure, the clearer the choice between repair and replacement.
- The appliance locks out repeatedly with codes that return after a reset.
- The boiler fires briefly then stops while the thermostat still calls for heat.
- Circuit pressure keeps falling below about 1 bar with no visible leak.
- Upstairs radiators stay cold while the boiler runs, despite bleeding.
- Hot water is unstable or the boiler makes unusual noises at startup.
- After work on heat exchanger, electrode or NTC, consumption stays high or erratic.
Before installation
What you can prepare
A few details and a clear work area speed up the quote and installation. You do not need to dismantle the appliance yourself.
- 01
Note make, model and fault codes
Write down the latest codes or display messages and when the fault started. That helps the first on-site assessment.
- 02
Clear the plant area
Ensure access to the boiler, flue and gas connection. Remove loose items around the work zone.
- 03
Share comfort changes
Mention recent radiator changes, underfloor heating or if hot water is a priority. That feeds into sizing.
- 04
Call to schedule
Our line is available 24/7. We review your situation and arrange a visit for measurement and the final price before work starts.
Transparent pricing
What determines the price
Installation on quote: we set the price after a visit on site.
The price depends on the appliance chosen, flue or condensate adaptations, circuit flushing and any extra controls. A straight swap in the same position is not priced like a relocation with new pipe runs.
We check these points on site, before any appliance is ordered. Call for an initial indication with no obligation.
Benefits
- Repair versus replace and output sized to demand, not habit
- Flue, air supply and condensate checked for feasibility first
- Circuit flushed before connection so debris does not reach the new heat exchanger
- Commissioning with flue gas analysis and guidance on pressure around 1 to 2 bar
Equipment & techniques
Periodic boiler servicing is mandatory, at an interval that depends on the region, the fuel and the output. The rules and their sources
FAQ
Frequently asked questions
Question not on the list? We answer it by phone, no obligation.
+32 2 000 00 00How much does boiler installation cost?
Installation on quote: we set the price after a visit on site. The price depends on the appliance chosen, flue or condensate adaptations, circuit flushing and any extra controls.
How do I know whether to repair or replace my boiler?
We read faults, pressure and combustion and look at repeat failures on heat exchanger, pump or controls. Sometimes a part is enough; with structural wear or recurring codes we advise replacement at the right output.
Why should the new boiler not be larger than the old one?
Too much output causes short cycling: the appliance heats quickly then shuts off, which wears components and raises consumption. We size from measured emitter output, not the old nameplate alone.
Who may install a gas boiler in Belgium?
Gas work and commissioning must be carried out by a recognised installer. Where post-installation inspection or acceptance is required, we guide you through it and explain what to keep on file.
What pressure is normal after installation?
On many systems circuit pressure sits between about 1 and 2 bar when cold, depending on height and volume. At handover we show how to read pressure and when topping up is needed.
Should the heating circuit be flushed?
Ahead of a new condensing boiler we flush when debris from older pipework could harm the heat exchanger. That protects the appliance and stabilises control.
Is there a warranty on the installation?
Up to 2 years warranty on labour; parts carry the manufacturer’s warranty.
When should you call a heating engineer straight away?
If you smell gas, leave the building and call 112 before doing anything else. Other signs also call for action: a carbon monoxide alarm going off, soot marks or fumes around the boiler, a lockout that keeps returning, or a leak on the heating circuit. Avoid resetting the boiler over and over, as the lockout protects the installation and points to a fault that needs tracing.
Present in Brussels, in Wallonia and in Flanders
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