Do you need a permit for tankless water heater installation? in Spain
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?
Usually yes
- Permitting authority
- Comunidad Autónoma (Industria) / Instalador autorizado
- Typical fee
- €50–€250
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 Spain, for gas tankless water heaters, installation requires a certificado de instalación issued by an instalador autorizado (authorized installer) registered with the Comunidad Autónoma's Dirección General de Industria. The installer must file a Boletín de Gas with the distributor (e.g., Naturgy, Nedgia). The installation must comply with RITE (Reglamento de Instalaciones Térmicas en los Edificios) and the ITC-ICG for gas installations. For electric models, a Boletín Eléctrico (CIE) may be required if the installation exceeds existing circuit capacity. No licencia de obra is typically needed unless walls are modified.