Is it permitted to shower on Shabbat with hot water heated by a solar water heater?

Shalom rav,

It is forbidden to shower all or most of one’s body on Shabbat in hot water heated by a solar water heater, and only one’s face, hands, and feet, or other limbs, are permitted (see Shulchan Aruch and Rema, section 326, paragraph 1, and Mishnah Berurah, seif katan 2).

However, one who is accustomed to showering his entire body every day, and suffers greatly if he does not do so, may shower his entire body even on Shabbat in water heated before Shabbat, provided that he is careful not to wring out his hair (Chazon Ovadia, Shabbat, part 6, page 88, and Shemirat Shabbat Kehilchatah, part 1, chapter 12, paragraph 1, based on the Beur Halachah there in the name of Chiddushei Rabbi Akiva Eiger).

And water heated on Shabbat by a solar water heater has the status of water heated before Shabbat (Chazon Ovadia there, page 87, and Shemirat Shabbat Kehilchatah there, paragraph 3), so in a case where he suffers greatly, it will be permitted for him to shower his entire body with it as above. But if he does not suffer greatly, it is forbidden for him to shower all or most of his body with it, and only his face, hands, and feet, or other limbs, are permitted as above.

Shabbat shalom,

Hillel Meirs