Most gas control valves have a knob with various labels such as A-B-C on them. According to the U.S. Department of Energy, for each 10 degree reduction in water temperature, you can save between 3 … From what I’ve researched, my recommendation of setting the temp to 130 degrees may not kill Legionella bacteria as quickly as 140, but it should still do the job. On my water heater I get 120°F water with a setting of ‘B.’ When the temperature at the tap is 120°F the temperature in the tank will be about 130°F which is enough to prevent bacterial growth. Turning down the temperature 10 degrees Fahrenheit on your hot water heater saves 3 to 5 percent on energy costs, so a drop from 140 F to 120 F saves you 6 to 10 percent. Thank you for the article. How to Set the Upper and Lower Thermostats on Dual-Element Water Heaters. Every other page I’ve been to has been long and pretty useless . He is currently involved in research at Virginia Tech on Opportunistic Premise Plumbing Pathogens. If all else fails, the heating element may be failing, and needs to be replaced. Consult a qualified installer or service agency. Replacing a Hot Water Heater. Is there something we could do. Commercial applications are a bit different that residential. By following a 3-step annual maintenance plan, it can help to significantly extend the life of your hot water heater. Normally this cold water goes to the bottom of the tank via dip tube but if the tube is broken, the cold water would refill at the top which is where hot water is normally taken from. Tank Water Heaters provide a large volume of dependable, low-cost hot water. This does not heat water, but keeps the pilot light ignited. Step 1: Check you water heater temperature setting. water heater. Insert your cooking thermometer, and then adjust the settings as desired. This will help save energy/gas while it is not being used. But in any case they do not necessarily relate to any specific temperature, just that B is hotter than A, and C is hotter than either A or B. ****, Step 2: Test the temperature and pressure relief valve, The temperature and pressure relief valve is  critical to safety and proper operation of the tank.Â. The problem is when I turned it slightly below the “A” mark, we quickly run out of hot water and even then it’s not hot long enough to my liking. You drink cold water anyway. If you have already set the temperature and are saying to yourself, “I have no hot water” or not enough of it, there are a few factors that may be affecting the heat. I added what they call a “Water Heater Tank Booster”. Remove the access panels. Guidelines from the department explain that most hot water heaters are automatically set to 140 degrees Fahrenheit, but that’s usually unnecessary. Keep in mind that the thermostat is factory preset to a recommended temperature and changing the setting may increase the potential for serious burns. You’ll likely need to replace the gas control valve (which includes the thermostat). Fuel sources can be propane, natural gas or electricity. It is currently on A and hot water from the tap reads 150*, which most professionals recommend 120 since it only takes about 2 secs for 150* to cause burns. Here is what temperature each letter stands for: While that might not be the best example due to it being a lead issue, the point is that clean water has to flow through dirty pipes and then just sits at the bottom of a water heater tank. There are many reasons why you might need to consider replacing your hot water heater. Please help, Thank you. but i do a lot of baking and cooking and the high temp keeps me from constant concern about bacteria and makes clean up a relative cinch. The water was 2 3/4″ up the tank. You’d have hot water at the start, but as soon as you start using it, cold water is refilled back into the tank. We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites. In the rare chance any bacteria makes it to an outlet, only a tiny percentage of individuals even have the possibility of getting Legionairres (and they have to inhale the hot water or steam in a shower). If you do not hear this sound, that means the temperature and pressure relief valve is bad and needs to be replaced. The water heater is built to produce hot water with the temperature ranging from approximately 80 F to 160 F, or higher when used in commercial applications. Hydrogen gas can be produced in a hot water system after a period of non-use (generally two or more weeks). , Very hot or something similar cooking thermometer a thermostat issue if water... 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