I know there is a way to do Tevilas Ezra( and hence erev yom Kippur Tevilah) in the Shower how is it done?

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    Some hold the requisite 9 kav simply come through in the normal course of showering.
    – WAF
    Sep 17 '10 at 19:13

The amount isn't 40 sa'ah, it's only 9 kav. From an IDF Q&A distributed by ShemaYisrael:

Q. How can a soldier who is on duty fulfill the custom of immersion in a mikveh on Erev Yom Kippur?

A. ... The poskim write, however, that one who finds immersion difficult can rely on fulfilling his obligation by pouring 9 kavim of water on himself (depending upon various halachic opinions, that amount can range from between 12.5 to 22 liters of water) in an uninterrupted flow that covers his entire body. This is possible by showering.

That means 9 kav is ~3--6 gallons. Even a low-flow showerhead will use that much water in a 5 minute shower; of course how much of that water wound up on you? Make it a ten-minute shower and I think you're all set. I don't think there's any other special procedure, other than making the shower continuous (not turning it off to get the soap or something).

The "9 kav" requirement allows for water that sat in a storage tank, too (unlike the 40-sa'ah-of-fresh-water for a mikvah). Which means the water can be heated.

  • 2
    I love that I did a Google search for "mikvah 40 sa'ah" and this thread came up as the 4th (and 1st Jewish) hit! Good job, mi.yodeya!!
    – Seth J
    Oct 14 '10 at 19:29
  • Isn't it required that the water directly hit every part of the body? This doesn't necessarily happen in the course of a standard shower.
    – Dave
    Aug 21 '11 at 5:56
  • 1
    @Dave the 9 kav need to be on 'rosho verubo' = head and torso IIRC
    – Double AA
    Oct 9 '11 at 5:06
  • Wait, can the water be hot or it doesn't matter?
    – user11227
    Oct 11 '15 at 15:37
  • @Jake any temperature, see added piece. 9 kav of "even water that was drawn in a bucket."
    – Shalom
    Oct 12 '15 at 15:44

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