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Rav Eliyahu Reingold, Rosh Kollel in the Yeshiva of Greater Washington, spent many years learning in the Telshe Yeshiva and Kollel where he was recognized as one of their foremost talmidim. He taught in the Telshe Mechina before coming to the Yeshiva of Greater Washington. He is a noted Baal Halacha and Baal Mussar, serving as a well-respected posek for the Yeshiva and community. Besides his responsibility in leading the Kollel, he delivers a high level shiur to advanced students, and provides many halacha shiurim throughout the year. His heartfelt weekly mussar shmuess in an inspiration to all.
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Bishul 32 - Kiruv Bishul 2 (Klal 20 Siman 9) S0529
We have finished siman 9, where the Chayei Adam discusses kiruv bishul, the issur of hastening the bishul process.
The Chazon Ish discusses putting up an urn with water which has not fully cooked. We know that the less water in the urn, the faster it will cook. If so, one cannot remove water from the urn until it is fully cooked, since the removal of water will cause the remaining water to cook more quickly. This issue can be extremely relevant when one needs hot water early into Shabbos, such as to warm a baby bottle. It is assur to take water from the urn before it is fully cooked.
The Shulchan Aruch extends the concept of kiruv bishul to covering a pot with some form of insulation. Although hatmana is assur on Shabbos, there is no issue of adding layers once the pot is in a state of hatama from before Shabbos. However, if the food is not fully cooked, it is assur to add layers of insulation even if the pot was in a state of hatmana from before Shabbos. (It is important to note that it is assur to insulate a pot which is on the fire, so this whole case is when the pot was removed from the fire before insulating it.)
A traditional hot water boiler system works that when hot water is pushed out, it is immediately replaced by new water from outside. The pressure from the water main pushes out the hot water to the faucet, and brings in cold water at the same time. The new water which comes into the boiler is cooked by the heating element in the boiler. So therefore, one may not turn on the hot water on Shabbos and cause the new water to be cooked.
If a person accidentally turned the hot on over Shabbos, or if it was running from before Shabbos, the question now is whether it is muttar to turn it off. As long as new cold water is coming into the boiler, the water in the tank will cook more slowly, because there is always cold water being added to the boiler. When the faucet is turned off, it allows for the new water currently in the tank to cook more quickly, since there is nothing further diluting the boiler. If so, turning off the water is a problem of kiruv bishul and is assur.
On the other hand, if a person turned on the hot water and realized their mistake immediately, one may turn off the faucet immediately. As long as only a minute amount of water was added to the tank, we can assume it was cooked immediately within the tank (seeing that standard water tanks are 40 gallons). If so, shutting the faucet does not cause any kiruv bishul. since there is nothing further to cook. However, if a person does not turn it off immediately, there will be a concern of kiruv bishul and they should not turn off the faucet.
Summary
Some applications of kiruv bishul include:
Removing water from an urn before the water is fully cooked,
Adding layers of insulation to a pot which is not fully cooked,
Turning off a hot water faucet once it has been on for more than a moment.