Calculators for esPRO® heaters
Power calculators
Calculate the required power in Kilowatts (Kw) to maintain water temperature using the flow rate in liters or gallons per minute (LPM or GPM) and temperature change required in degrees Celsius (°C) or Fahrenheit (°F).
KW=GPM x △T°C3.79
Values can't be < 0
0 KW
KW=LPM x △T°C14.34
Values can't be < 0
0 KW
KW=GPM x △T°F6.82
Values can't be < 0
0 KW
KW=GAL x SPH x SPW x △T°C31.5 x MIN
Values can't be < 0
0 KW
Time calculators
Calculate the heating time in minutes (Mins) using the volume of water (Gal), the temperature change required in degrees Celsius (°C) or Fahrenheit (°F), and the power available in Kilowatts (Kw).
MIN=GAL x SPH x SPW x △T°C31.5 x KW
Values can't be < 0
0 MIN
MIN=GAL x SPH x SPW x △T°F56.8 x KW
Values can't be < 0
0 MIN
Temperature calculator
Calculate the temperature change in degrees Celsius (°C) using the power available in Kilowatts (Kw), the heating time in minutes (Mins), and volume of water in gallons (Gal).
△T°C=31.5 x KW x MINGAL x SPH x SPW
Values can't be < 0
0 °C
Water Properties & Key Definitions
Basic Water Measurements
- 1 gallon of water equals 231 in³, 0.1337 ft³, or 3.785 liters
- The weight of 1 gallon of water is approximately 8.337 pounds
- 1 cubic foot of water weighs 62.4 pounds (at 20°C)
- Water’s specific heat is:
- 1 calorie/gram per °C (at 15°C)
- 1 BTU/lb per °F (at 15°C)
- Specific weight of water is 8.337 lbs/gallon
- Heat of vaporization for water is around 965 BTU/lb
Common abbreviations
- KW = Kilowatts
- Gal = Gallons
- In = Inches
- Mins = Minutes
- SpH = Specific Heat (of a solution)
- SpW = Specific Weight (of a solution)
- △T°C = Temperature change in Celsius
- △T°F = Temperature change in Fahrenheit
Unit Conversions
- 1 inch = 2.54 cm = 25.4 mm = 0.083ft
- 1 cm = h = 2.54 cm = 25.4 mm = 0.083ft
- 1 in³ = 16.39 cm³
- 1 BTU = 0.2933 watt-hours
- 1 Kilowatt-Hour = 3,412 BTU
Ohm’s Law & Electrical basics
- Voltage (V) = Current (Amps) × Resistance (Ohms)
- Power (Watts) = Current² × Resistance
- Current (Amps) = Power ÷ Voltage
- For a balanced 3-phase load: Current per phase = (Watts ÷ Volts) × 0.578
