save your water heater
Calcium and hard mineral build up on the inside of the water heater causes this “grumble.” It also robs the heater of efficiency and shortens it’s life. The age of your water heater can be a big factor when considering options that will remedy the problem. Installing a water softener can help lengthen the life of your water heater and provide you with healthier drinking water. Another alternative for consideration would be the installation of a sacrificial anode rod. This metal rod, attracts hard minerals that would otherwise build up on the inside of your water heater.