Hot water heater stopped working and tenant is moving out

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Water heater in rental went out. Need to install new one, pull permit and bring connections up to code. New water heaters are too large to fit in closet where tank is stored. Will take several days to complete install. Have to order tank online. Tenant is moving out on 1/3/21. It's been 3 days without hot water. How do I pro-rate rent in this case? Should I pro-rate? She is essentially moved out. No furniture, not living in unit as of today, but she is making a big deal about no hot water. Any suggestions are appreciated. Thanks in advance.