Sealed unvented (pressure-tested) for supplying several draw-off points. The DHW temperature in the appliance is permanently set to 55 °C and is maintained up to the output limit. Via the electronic controller, the electric output is automatically matched to the demand. The bare wire heating system is suitable for hard and soft water areas (for application range, see specification). Installation with pressure fittings. Threaded water connections for installation on finished or unfinished walls. Ideal replacement appliance; matches the installation interfaces of STIEBEL ELTRON instantaneous water heaters.