Last updated on 3 April 2020
Do you live in an apartment and plan to replace your old individual boiler with a new condensing model? Caution: for connection, some precautions are required in order to avoid any danger and to comply with the regulations on appliances connected to a collective duct.
In addition, connecting a new condensing boiler to a collective chimney is not technically simple. This problem also requires a collective response and the involvement of all the occupants of the building.
Several problems can arise when connecting a new condensing boiler to an old collective flue:
There's no question of 'tinkering' to arrive at an approximate solution: we're talking about the safety of all occupants of the building. Only an expert who is properly specialised in these issues can take into account all the technical aspects of the problem. Not all heating engineers have this expertise and the best thing to do is refer to a specialist consultancy.
After examining the flue and the installation of other appliances, an experienced professional may propose:
To determine what is possible, it would be ideal to carry out a duct inspection by camera. This will also often be the opportunity to discover unknown problems (interior collapses, various objects, air conditioning pipes crossing the flue, kitchen hood or dryer connections, etc.).
Good to know: in Brussels there's a grant for chimney intubation
Upgrading your heating system is a good idea! However, it is much easier when all the occupants of a building coordinate to make this change at the same time. In this case, you simply adapt the duct of the collective chimney and at the same time replace all the devices connected to it.
Your neighbours aren't all ready to take the plunge? Two solutions can be considered:
In any case, such a project must be submitted to the trustees and discussed between the co-owners. This naturally entails joint investments (note that in Brussels there's a grant for chimney intubation). But the reality is that this expenditure will be necessary sooner or later. The advantage is that after the change, the whole installation will be ecological and energy efficient, while meeting current safety requirements.
For additional details see 'Le remplacement des chaudières individuelles à brûleur atmosphérique raccordées à une cheminée collective existante', a bulletin by Bruxelles Environnement (only available in French and Dutch).
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