Two classrooms have been affected by the incident at Hadleigh High School and the building is also without heating.
Hadleigh High School will be closed today due to flooding caused by a burst pipe.
Two classrooms have been affected by the incident and the building in Edgeworth Road, Ipswich, is also without heating.
A build up of pressure in the system caused the boiler to automatically switch off after the leak started last night.
Karen Bark, business manager of the school, said Suffolk County Council is working hard to repair damage and Hadleigh High will be ready to re-open on Monday morning.
To ensure they do not fall behind, year 11 pupils are taking part in catch up study sessions.
In addition, food technology students were due to sit their GCSE in the subject today and this will go ahead as scheduled in the school.
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