| ||The Rheem Integrity is a compact, gas instantaneous or continuous flow water heater with optional temperature controllers. Rheem Integrity will never run out of hot water. It doesn't store water - instead, it heats it instantly when you need it. Rheem Integrity's design is ideal in homes where space is at a premium. Choose the exact water temperature you desire. Between 37°C and 50°C in the bathroom to protect the little ones (and not so young) from the risk of scalding, and up to 60°C in the kitchen and laundry (871 models only) where you need hotter water temperatures.