Electric boiler: Many Poskim[1] rule it is permitted to open the hot water tap even if cold water enters into the boiler in the process[2], and even if doing so will eventually cause the boiler to turn on due to loss of temperature.[3] Some Poskim[4]however rule it is forbidden if doing so will eventually cause the boiler to turn on. According to all, it is forbidden to open the tap if doing so will cause the boiler to activate immediately upon opening the hot water knob. In such a case it is forbidden for it to be opened or closed even on Yom Tov.
Solar boiler-Dud Shemesh: Is permitted to be used freely for washing dishes, hands and the like. It is allowed to be done even if cold water enters into the boiler in the process.[5]
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[1] SSH”K ibid; Piskeiy Teshuvos ibid; Beir Moshe 8 [see appendix]
[2] As it is not possible to remove the hot water without having the cold water enter, and hence also the cooking of this cold water is considered a Yom Tov need. [ibid]
[3] As this is a mere Grama with electricity on Yom Tov. [ibid]
[4] See Piskeiy Teshuvos ibid
[5] As it is not possible to remove the hot water without having the cold water enter, and hence also the cooking of this cold water is considered a Yom Tov need. [SSH”K ibid]
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