My electric water heater does not seem to be putting out as hot of water as it should. In an effort to get hotter water I've increased the thermostat temp to ~130F. My showers still seem luke warm and at the tap I'm getting about 105-110F. I understand they'll be some line loss but I shouldn't be getting luke warm showers when my thermostat is at 130. There may be issues with my mixing valve in my shower, but in my investigation I opened the drain on the water heater to test the temp directly from it. The water was essentially room temperature and that makes me think my lower heating element or thermostat has failed. How can I go about confirming which one (thermostat or heating element) have failed, if any?