The answer to 'pressure regulator no hot water' is that the pressure regulator may be causing the issue with your hot water. A pressure regulator is a device installed on the main water supply line that controls the water pressure entering your home. If the pressure regulator is malfunctioning or set too low, it can reduce the water pressure and flow, resulting in no hot water or low water pressure in your home.
Some common symptoms of a pressure regulator issue include low water pressure, no hot water, or inconsistent water temperature. To troubleshoot, you can try adjusting the pressure regulator by turning the adjustment screw clockwise to increase the pressure. If that doesn't resolve the problem, the pressure regulator may need to be replaced by a professional plumber.