David O'Banion of South Bend confessed to breaking in and forcing the woman into a bathtub last month.
Investigators say the 38-year-old took care of her lawn. He's charged with burglary.
An AEP worker was the first to notice something was wrong at the home.
Terrance Bank was checking the meter when he saw the screen to a rear window knocked to the ground. Then he heard the woman's cries for help, so he called 911.
The victim had minor injuries.
O’Banion must also serve 10 years of probation upon release.
The possible penalty for a Class A felony is 20 to 50 years.