Lymington Urgent Treatment Centre is closed to patients today, with a number of appointments cancelled.
The flooding has caused a loss of heating and water at the site, leaving the hospital with no option but to close while repairs are carried out.
A spokesperson for Hampshire and Isle of Wight Healthcare NHS Foundation Trust said: “Due to a significant water leak overnight affecting heating and water supply, a number of our services at Lymington Hospital, including the Urgent Treatment Centre, are temporarily closed today.
“We can confirm that our inpatient care is able to continue safely, but unfortunately, the majority of our outpatient clinics, diagnostics, and elective procedures have had to be cancelled today.
“Patients have been contacted to rebook their appointments and we are working to triage our most urgent patients to limit any delays to their care.”
The hospital has also confirmed it is unable to accept visitors to its inpatient ward.
Family and friends are being encouraged to contact the relevant ward directly for updates on their loved ones’ care, either via the ward’s direct phone number or by calling the main switchboard on 01590 663000.
The spokesperson added: “Rest assured, regular updates will be provided as works to fix the leak and the resulting damage progress. Teams are on site and are working to resolve this as soon as possible, and we are hopeful that most of our services will resume as normal later this week.
“Please do not attend Lymington Hospital today unless you are contacted by your healthcare team directly.”