The DC iPurifier 2 is rated for 24V which includes normal 5% tolerances, so 25-6v may work, but it will be near its limits.
It is possible if the tolerances of the DC iPurifier 2 protection circuitry, and of the 25-6v DC power-supply, accumulate. In a worse-case, the DC iPurifier 2 will enter protection mode and shut down. It may do so after a fair while if the status is just at the edge.
So we cannot recommend or guarantee operation with a 25-6v power supply attached.
