JoeMazz, we found that out, LOL. We only took a total of 3 showers in the RV. We had tried the campground showers, it was hard to control the temp and they had push buttons to turn them on that only lasted 10 seconds or so and you had to push it again to turn them on. The tankless water heater in the Precept worked wonderfully. Unfortunately, too well since we didn't watch how much hot water we were using. LOL