Keep pints, watts and kWh in different columns
| Quantity | Unit | Meaning |
|---|---|---|
| Capacity | Pints per 24 hours | Water removal under the specified test conditions |
| Input power | Watts | Electrical power at a moment or operating mode |
| Energy | kWh | Electricity accumulated over a period |
| Integrated Energy Factor | Liters per kWh | Standardized water removal relative to energy, including defined modes |
The number 50 cannot be entered as watts. Tank size is another separate quantity: a smaller bucket may simply need emptying more often. Match the exact model and rating version when comparing products.
Understand what IEF can and cannot do
ENERGY STAR defines Integrated Energy Factor in liters of water removed per kWh under the applicable test procedure. A higher IEF indicates more standardized water removal per unit of electricity within a comparable class.
For unit practice only, 50 U.S. pints is about 23.7 liters. At an invented 2.5 L/kWh, removing 23.7 liters under matching conditions would correspond to about 9.5 kWh. That is not a forecast for one calendar day in your room: actual temperature, humidity, cycling and water availability differ from the test.
Use IEF to compare models with compatible capacity and test bases, not to promise a daily bucket total. A unit may reach its humidity target and cycle before removing its rated capacity, or the room may supply less moisture than the test condition.
Calculate actual cost from a representative day
Suppose the exact appliance records 5.0 kWh over a complete damp day. At $0.18/kWh, that day costs $0.90. If a later maintenance day uses 2.0 kWh, it costs $0.36. Thirty days are unlikely to be identical, so total the daily or weekly kWh when possible.
If only input watts are available, create clearly labeled constant-power scenarios. Do not multiply maximum watts by 24 and present the result as measured normal use when a humidistat cycles the compressor.
Choose capacity for the moisture load, not the cheapest row
ENERGY STAR ties recommended capacity to the size and dampness of the space and notes operating-temperature, drainage and humidistat considerations. A lower-capacity unit that cannot manage the moisture is not an equivalent alternative simply because its hourly electricity estimate is smaller.
Investigate leaks and building moisture sources. Keep the target relative humidity, water removed, hours, energy and room conditions together so a future comparison measures a similar outcome.
Choose your next step
Continue with the question that matches your next decision:
Sources & further reading
Numerical examples are illustrative unless explicitly described as measured. This guide does not claim hands-on product testing. Read the methodology and editorial disclosure.