Buck Turgidson wrote:
....
Be cautious about turning your heat off completely as one suggested unless
your pipes are sure to remain reasonably warm.

It would have to be awfully cold for heat to only be off for a portion
of the day to lead to actual freezing of pipes solid enough to cause
damage...

It is possible over a longer period such as vacation that pipes in an
exterior wall, for example, may not receive sufficient waste heat and
cause a problem even though the interior temperature is still well above
freezing.