For vacant properties it is important for an agent/home owner to remember it is not summer time, and homes do not need the same treatment or lack thereof. We should make sure the water is either off and pipes are run until all water is out, or we need to visit the home a couple times a week turning on the water and sometimes letting it run in the sink. I can recall when I lived in the midwest, we used to leave our sinks dripping at night to keep a constant flow of water running through the home. This would prevent the water from sitting in the pipes, freezing, and expanding.
I think all property managers would agree, rather than having a home vacant we would like to find a qualified applicant and rent that property ASAP!!