Enter the mass of the water (kg), the change in temperature (T), and the total energy input into water heater (J) into the calculator to determine the Water Heater Efficiency.
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Water Heater Efficiency Formula
The following formula is used to calculate the Water Heater Efficiency.
Ewh = m*C*dT / Q * 100
- Where Ewh is the Water Heater Efficiency (%)
- m is the mass of the water (kg)
- C is the change in temperature (C)
- Q is the total energy input into water heater (J)
- C is the specific heat of water (4.186 J /kg-C)
How to Calculate Water Heater Efficiency?
The following example problems outline how to calculate the Water Heater Efficiency.
Example Problem #1
- First, determine the mass of the water (kg). In this example, the mass of the water (kg) is given as 16 .
- Next, determine the change in temperature (C). For this problem, the change in temperature (C) is given as 20 .
- Next, determine the total energy input into water heater (J). In this case, the total energy input into water heater (J) is found to be 2200.
- Finally, calculate the Water Heater Efficiency using the formula above:
Ewh = m*C*dT / Q * 100
Inserting the values from above and solving yields:
Ewh = 16*4.186*20 / 2200 * 100 = 60.88 (%)
Example Problem #2
Using the same method as above, determine the variables required by the equation. For this example problem, these are provided as:
mass of the water (kg) = 24
change in temperature (C) = 30
total energy input into water heater (J) = 5000
Enter these given values yields:
Ewh = 24*4.186*30 / 5000 * 100 = 60.278 (%)
