Inclusion Criteria:  Male subject of 40 - 80 years of age Has provided informed consent Has a diagnosis of bladder outlet obstruction due to benign prostatic enlargement Able to complete self-administered questionnaires Is a surgical candidate for Rezum Has medical record documentation of Qmax < 15 ml/s Has medical record documentation of prostate volume from 30-80 ml by transrectal ultrasound (TRUS) Has a bladder contractility index score ≥ 100, calculated by detrusor pressure at Qmax (pDet@qmax) + (5xQmax). Willing to undergo pressure-flow studies to calculate BCI prior to surgical intervention. Has serum creatinine within the normal range. Able to perform intermittent catheterization.  Exclusion Criteria:  Has a life expectancy < 2 years Is currently enrolled in or plans to enroll in any concurrent drug or device study Has an active infection (e.g., urinary tract infection or prostatitis) Has a diagnosis of or has received treatment for chronic prostatitis or chronic pelvic pain syndrome (e.g., nonbacterial chronic prostatitis) Has been diagnosed with a urethral stricture or bladder neck contracture within the last 180 days Has been diagnosed with 2 or more urethral strictures and/or bladder neck contractures within 5 years Has a diagnosis of lichen sclerosis Has a diagnosis of neurogenic bladder or other neurologic disorder that affects bladder function Has a diagnosis of polyneuropathy (e.g., diabetic) Has a history of lower urinary tract surgery Has a diagnosis of stress urinary incontinence that requires treatment or daily pad or device use Has an inability to perform intermittent self-catheterization Has been catheterized or has a post-void residual (PVR) of > 400 ml in the 14 days prior to the surgical procedure Has a current diagnosis of bladder stones