assalamualaikum what is the reward for being in the state of Wudu all the times?

All perfect praise be to Allaah, The Lord of the Worlds.  I testify that there is none worthy of worship except Allaah, and that Muhammad, sallallaahu ‘alayhi wa sallam, is His slave and Messenger.

If a Muslim maintains ablution all the time and is keen on always being on the state of ritual purity, then this is a virtue and an act by which he gets closer to Allaah.

‘Abdullaah Ibn ‘Amr narrated that the Prophet said: "Adhere to righteousness (as much as you can), you will never be able to encompass it all. Know that the best of your deeds is the prayer, and none will preserve his ablution except a believer.” [Ahmad and Ibn Maajah]

This Hadeeth proves that preserving one's ablution is one of the signs of faith.

Allaah Knows best.