Do you need a permit for tankless water heater installation? in Nederland
Usually yes. Installing a tankless (on-demand) water heater typically requires both plumbing and possibly gas or electrical permits because it involves modifying water supply lines, gas piping or electrical circuits, and venting. Even replacing a tank-style heater with tankless usually triggers permits due to different connection requirements.
Do you need a permit?
Rarely required
- Permitting authority
- Omgevingsloket / Erkend installateur
- Typical fee
- €0–€150
What triggers a permit
- New gas line installation or modification of existing gas piping
- Electrical circuit upgrade (200+ amp for electric tankless models)
- Venting through exterior wall or roof (gas models)
- Replacing tank-style heater with tankless (different connections and load)
Country-specific detail
In the Netherlands, replacing a water heater does not typically require an omgevingsvergunning. However, for gas models, the installation must be performed by a recognized installer (erkend installateur) registered with InstallQ or Techniek Nederland. The installer issues a verklaring van installatie (installation declaration) that certifies compliance with NEN 1078 (gas) and NEN 7120 (energy performance). If the new unit requires different venting (e.g., from open flue to room-sealed), the existing flue must be assessed. Electric models above 12 kW may require a heavier electricity connection (zwaardere aansluiting) from the netbeheerder.