Water Heaters and Methods for Monitoring Anode Rod Depletion
Water heaters and methods for monitoring anode rod depletion in water heaters are provided. A water heater includes a tank for holding a volume of water, and an anode rod extending into the water and electrically connected to an electrical ground such that a galvanic current flows from the anode rod to the electrical ground. The water heater further includes at least one heating element configured to heat the water when energized, and a controller. The controller is configured to receive a galvanic current level, compare the galvanic current level to a threshold current level, and transmit an alert signal when the galvanic current level is less than the threshold current level.
1 . A water heater, comprising:
a tank for holding a volume of water;
an anode rod extending into the water and electrically connected to an electrical ground such that a galvanic current flows from the anode rod to the electrical ground;
at least one heating element configured to heat the water when energized; and
a controller, the controller configured to:
receive a galvanic current level;
compare the galvanic current level to a threshold current level; and
transmit an alert signal when the galvanic current level is less than the threshold current level.
2 . The water heater of claim 1 , wherein the threshold current level is a predetermined threshold current level.
3 . The water heater of claim 2 , wherein the predetermined threshold current level is between 1 milliamp and 1.5 milliamps.
4 . The water heater of claim 1 , wherein the controller is further configured to:
receive an initial galvanic current level before receipt of the galvanic current level; and
calculate the threshold current e based on the initial galvanic current level and a depletion factor.
5 . The water heater of claim 4 , wherein the depletion factor is between 10% and 30%.
6 . The water heater of claim 1 , wherein the threshold current level is a first threshold current level and the alert, signal is a first alert signal, and wherein the controller is further configured to:
compare the galvanic current level to a second threshold current level, the second threshold current level less than the first threshold current level; and
transmit a second alert signal when the galvanic current level is less than the second threshold current level.
7 . The water heater of claim 6 , wherein the second alert signal is different from the first alert signal.
8 . The water heater of claim 6 , wherein the second threshold current level is a predetermined threshold current level.
9 . The water heater of claim 8 , wherein the predetermined threshold current level is between 0.3 milliamp and 0.7 milliamps.
10 . The water heater of claim 1 , further comprising a reference probe, the reference probe extending into the water and electrically connected to the electrical ground.
11 . The water heater of claim 10 , wherein the controller is configured to:
receive a reference feedback signal; and
adjust the threshold current level based on the reference feedback signal.
12 . A method for monitoring anode rod depletion in a water heater, the method comprising:
receiving a galvanic current level flowing from the anode rod to an electrical ground, the anode rod extending into a volume of water disposed within a tank of the water heater,
comparing the galvanic current level to a threshold current level; and
transmitting an alert signal when the galvanic current level is less than the threshold current level.
13 . The method of claim 12 , wherein the threshold current level is a predetermined threshold current level.
14 . The method of claim 12 , further comprising:
receiving an initial galvanic current level before receipt of the galvanic current level; and
calculating the threshold current level based on the initial galvanic current level and a depletion factor.
15 . The method of claim 14 , wherein the depletion factor is between 10% and 30%.
16 . The method of claim 12 , wherein the threshold current level is a first threshold current level and the alert signal is a first alert signal, and further comprising:
comparing the galvanic current level to a second threshold current level, the second threshold current level less than the first threshold current level; and
transmitting a second alert signal when the galvanic current level is less than the second threshold current level.
17 . The method of claim 16 , wherein the second alert signal s different from the first alert signal.
18 . The method of claim 16 , wherein the second threshold currents a predetermined threshold current level.
19 . The method of claim 12 , further comprising receiving a reference feedback signal flowing from a reference probe to the electrical ground, the reference probe extending into the volume of water.
20 . The method of claim 19 , further comprising adjusting the threshold current level based on the reference feedback signal.