We have learnt the way of wudu’ from Prophet Muhammad (peace and blessings be upon him) through his authentic hadiths. Wudu’ includes parts that are substantial (fard) and parts that are desirable (sunnahs), and a Muslim is required to observe both of them.
With regard to this new product, since it is claimed to be helpful in sparing wasted water during wudu’ and correspond to all parts of wudu’, there will be nothing wrong with it, provided that a Muslim performs wudu’ in the right order and as reported from the Prophet (peace and blessings be upon him).
In his answer to this question, Sheikh Amr Elsamny, Imam of the Tempe Masjid, Arizona, the US and Member of AMJA and NAIF stated,
This new machine helps a Muslim make wudu’ without wasting water, as it is apparent that it is designed to limit the time of wudu’ and reduce the amount of water used in it. Based on the description of this machine, I think that there is nothing wrong with using it in wudu’, since it is helpful in performing the ritual of wudu’ while saving water, which had been emphasized by the Prophet (peace and blessings be upon him).
`Abdullah ibn Mughffal (may Allah be pleased with him) authentically narrated that he heard the Prophet (peace and blessings be upon him) saying, “There will be people from my nation who will transgress in making supplications and in purifying themselves” (Ahmad, Abu Dawud, and An-Nasa’i)
He himself (peace and blessings be upon him) used to make his wudu’ with a mudd (a quantity that fills the two hands together), as reported in the authentic hadith narrated by Safinah (May Allah be pleased with him) and related in Sahih Muslim.
Al-Bukhari said, “Scholars do not approve of using water beyond what the Prophet (peace and blessings be upon him) would use for wudu’.”
Anas (may Allah be pleased with him) said, “The Prophet (peace and blessings be upon him) used to perform ghusl (ritual bathing) with a sa` (around 4 mudds) of water, and he used to make wudu’ with one mudd of water” (Al-Bukhari and Muslim).
`Ubaydullah ibn Abu Yazid narrated that a man asked Ibn `Abbas, “How much water is sufficient for wudu’?” He answered, “One mudd.” The man asked, “And how much is sufficient for ghusl?” Ibn `Abbas said, “One sa`.” The man said, “That is not sufficient for me.” Ibn `Abbas said, “No! It was sufficient for someone better than you, the Messenger of Allah, peace be upon him” (Ahmad, Al-Bazzar, and At-Tabarani).
We have to maintain that it is sad to see a non-Muslim (Anthony Gomez, who invented the machine) attempting to help Muslims save water, while Muslims themselves are negligent of the guidance of the Prophet (peace and blessings be upon him) on wudu’. If Muslims observed the guidance of the Prophet in this concern, they would not be in need of such inventions.
Finally, after watching the video or demo of the new machine and realizing how it helps in performing all pillars and sunnahs of wudu’, including the rubbing of the organs and everything, I came to the conclusion that there is nothing wrong in using this machine to perform one’s wudu’.