Built in wall heater
We have recently purchased an older home that has no heat in the bathroom except for a built in wall heater near the floor. It measures on the outside of the grill 15" long and 8" tall. It's old and an eye sore. I cannot find a new one anywhere close to that size. I have not removed the grill so I'm not positive about the opening in the wall (size ). Any help or advice is needed.