Relatives of inmates at the Metropolitan Detention Center in Brooklyn joined other protesters on Saturday to demand the building’s problems with heat and electricity be quickly taken care of.

The federal lockup has had only limited heat and hot water for days, including those when the temperatures plummeted to minus figures.

At its height, the demonstration outside the jail attracted more than 100 people.

Beverly Disano said she hoped her son would at least have access to television so they could watch the Super Bowl on Sunday.

“That would keep them calm and make them have a good day if the TVs are working. … My son’s safety. That’s all I care about.”

Olga Rodriguez, who also has a family member in the prison, said “since the government shutdown they’ve been cooped up in their cells. They’ve been on lockdown for half the day and we hoped that after it [the shutdown] ended it would get better but its not! It actually got worse! . .

“I mean it, the Super Bowl has nothing to do with it.’’

Officials said Saturday that a new electrical panel was being installed after a “partial power outage” due to a fire in the switchgear room.