Can one put up cold water in an urn immediately before Shkiah on Friday, if forgot to do it earlier? What if one has many guests or a baby that would need hot water during Shabbos? 

 

The water must be at least half-cooked before Shabbos. In the event, it was only a third cooked before Shabbos it may be used on Shabbos. However, one may only take water from the urn on Shabbos after it has boiled completely.

This only applies to an urn that possesses a volume knob; where it’s possible to adjust the temperature on the urn. An urn that only has an on and off feature may be filled right before Shabbos. However, one may not remove any water from it on Shabbos until the water has boiled completely.

 

 

#5281