Why do I hear rumbling, crackling or popping from my Water Heater ? All across the United States, water systems have an amount of lime in them. When you apply heat to water that has lime, it creates more lime. The more heat the more lime. In a gas water heater the lime will build up on the bottom of the tank. Water trapped under the lime will boil off or turn to steam. This is what makes the rumbling, crackling or popping noise in the water heater. In an electric water heaters, the lime forms on the heating elements. When the element comes on, the water trapped under the lime will boil off or turn to steam. To prevent this problem the water heater needs to be de limed. You should always call a license plumber to de lime the heater so he can check the heater for problems the lime may have caused. Back to Top Why does my Water Heater have a expanded tank shell, collapsed flue tube or a deformed tank head? One reason that your water heater may look irregular could be due to water hammer. Water hammer is a pounding noise and vibration in the piping system. This noise is caused when water is flowing, then stops abruptly. The sound of water hammer is annoying and can harm the water heater tank. Examples of the damage this may cause is an expanded tank shell, collapsed flue tubes, and inverted or deformed tank heads. The only effective way to control the water hammer is to install a water hammer arrestor. The hammer arrestor device has diaphragms which separate an air chamber from the water in the piping system. As the shock waves reach the diaphragm in the arrestor, the cushion of air expands to let the water equalize in the system. Some water heater manufactures will not warrant the tank when you have an water hammer problem. If you do have water hammer noise in your house, you should call a license plumber to check out the plumbing system. This will prevent water damage from a ruptured tank, water line or faucet. Back to Top What is a temperature and pressure relief valve for a Water Heater? A temperature and pressure relief valve, known as a T & P valve, is a safety device. This device is installed in the top 6 inches of the water heater tank. A T & P valve limits temperature and pressure levels in the water heater. Each T & P valve has both a temperature and pressure rating. The rating for a residential heater is 210 degree and the pressure rating is 150 psi. The temperature and pressure relief valve should be changed every year from the date of installation, to make sure the it is in working order. This will protect your house and family. Back to Top Why does my Water Heater temperature and pressure relief valve drip water? When the temperature and pressure relief valve is dripping or just letting a little water out the drain this could be due to thermal expansion. Thermal expansion will take place when heated water is in a closed system. Water cannot be compressed, so when no hot water is being used, the water has to find a way to escape. In a closed system the incoming water pressure at 50psi, heated just 10 degrees will reach a pressure of 250psi. The temperature and pressure relief valve is designed be that escape. This will let off the pressure so the tank will not rupture. To control thermal expansion an expansion tank should be installed so the pressure has an air chamber to expand to. Back to Top Why does my Water Heater temperature and relief valve dump a gallon of water? When the temperature and relief valve dumps 1 gallon of water at a time, the water heater needs to be serviced. The water temperature in the tank is over 210 degrees. This causes the safety device to dump, bringing cold incoming water into the tank to cool the water temperature . The heater will need to be tested by a licensed plumber. This could be very dangerous for any one living in the house. Back to Top Do you have to replace a Water Heater that has been flooded? “The Gas Appliance Manufacturers Association (GAMMA) has determined that any gas appliance exposed to flooding should be replaced. The potential damage to gas controls both seen and unseen present a hazard that can only be avoided by replacement of the appliance. This is due to a number of factors including dirt and debris getting into the controls, as well as corrosion of the control and other components in the combustion train. Even though appliances exposed to flooding may appear to be operational, the gradual building of dirt and corrosion over time can render safety devices inoperative.” Yes you should replace the water heater. Back to Top Do you know what the temperature of your water in your Water Heater? A.O. Smith has published this for your protection. “SAFETY The water heater is equipped with an adjustable thermostat to control water temperature. Hot water at temperatures desired for automatic dishwasher and washing machine use can cause scalds resulting in serious personal injury and/or death. The temperature at which injury can occur varies with the person’s age and time of exposure. The slower response time of disabled persons increases the hazards to them. Never allow small children to use a hot water tap, or to draw their own bath water. Never leave a child or disabled person unattended in a bathtub or shower. The following table shows the approximate time-to burn relationship for normal adult skin. Temperature Time to produce a 2nd & 3rd Setting degree burn to adult skin 150° F About 1-1/2 seconds 140° F Less than 5 seconds 130° F About 30 seconds 125° F About 2 minutes 120° F More than 5 minutes” Always play it safe with your hot water. Back to Top If you have any other questions, please call 339-4669 Thank You, Roger Weddle