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The meal offerings in the Temple (that were unleavened – matzo) were kneaded with lukewarm water Rambam Maaseh Hakorbonos - Chapter 12 Halocho 21 despite the fact that this accelerates leavening. We are not worried that they may become leavened because the kohanim are very eager to do their jobs.

Contemporary matzo manufacturers would not dream of letting anything get lukewarm. See quotes from here

An extra water cooling unit for the ‘mayim’ ‘shelonu’ maintains a constant low temperature for the dough.

An exclusively designed mixer, only used for Passover Matzos, ensures a perfect mix with no flour residue and no heat development on beaters and bowls.

Air-conditioning in the Passover area maintains a low ambient temperature before the Matzos enter the oven.

So why did they use warm water in the Temple?

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When it comes to these things ,halacha says we are not as familiar with exact temperatures and methods,take chalita(boiling) for example Shulchan Aruch does not allow it by flour,by an issur like chametz we are extremely careful nowadays – sam Mar 30 '14 at 12:25
It could have simply a matter of comfort. The priests 'on call' had to eat crazy amounts of meat and walk around the the cold stone floor of the temple all night barefoot. Where possible, Maybe they tried to cut themselves a little slack. – Baby Seal Mar 30 '14 at 13:11
Because nowadays we are overly machmir. And they didn't have AC – Double AA Mar 30 '14 at 13:22
See the Tiferes Yisroel on Mishna 2 in masheches Menuchos,kol hamenuchos,who says its a hidur mitzvah... – sam Mar 30 '14 at 13:43
@sam All I can find Tiferes Yisroel to say is ח שכך יפה לפת: - here hebrewbooks.org/pdfpager.aspx?req=37947&st=&pgnum=191 – Avrohom Yitzchok Mar 30 '14 at 16:38

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