Check the Efficiency Grade of a Clothes Dryer Before You Buy
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Key Takeaway
Compare clothes dryers of similar drying capacity by efficiency grade and per-cycle energy. If the agency and the manufacturer show different grades, don't force one; check the label on the product on sale.
What do the kg and Wh in the dryer list mean?
The Korea Energy Agency's clothes dryer product search shows drying capacity, energy consumption per drying cycle (Wh), and efficiency grade together. The kg is the standard for how much the dryer can hold, and the Wh is the energy for one registered drying cycle. If you line up only the Wh of products with different capacities, you lose the difference in how much each handles at once. Decide the capacity you want first, then compare within a similar capacity range.
In the agency's registered rows I checked on October 8, 2026, the RD20WNA is 20kg, 2,014.4Wh, grade 2, and the RH19VTLN is 19kg, 1,887.8Wh, grade 2. Converted to kWh, that is 2.0144kWh and 1.8878kWh. These are just the agency's registered values with the units changed, not actual use for every cycle and fabric you might pick at home. The capacities differ too, so don't set a purchase order from one smaller Wh figure.
Where are the two dryers' official specs the same and where do they differ?
| Model | Manufacturer drying capacity | Manufacturer efficiency grade | Manufacturer power consumption | W×H×D (mm) | Door-open depth | Weight |
|---|---|---|---|---|---|---|
| RD20WNA | 20kg | Grade 1 | 950W | 700×990×820 | 1,380mm | 75kg |
| RH19VTLN | 19kg | Grade 1 | 950W | 700×990×820 | 1,380mm | 76kg |
Specs are from the official LG Electronics page and grades are from the Korea Energy Agency list, both as I saw them on October 8, 2026. Check prices on the sales page of the purchase link. Both manufacturer pages show grade 1, yet the agency's registered rows above both show grade 2. This material alone doesn't tell you why, or the manufacturing date of the product on sale. Check the manufacturing date, the full model name, and the actual label of the product you buy.
The agency notes that when measurement methods or standards change, efficiency can differ by manufacturing date, and the product label may show a lower efficiency than the reported result. But you can't conclude that this general notice explains the grade difference for these two models. It is more accurate to leave the very situation of official pages disagreeing as a check item before purchase.
Are 950W and the per-cycle drying energy the same number?
No. The units and time basis differ. 950W is the manufacturer's power consumption spec, and Wh is the energy for one cycle. 950W doesn't mean one drying run is fixed at 0.95kWh. Without knowing the run time and operating state, you can't link the two values, so read the manufacturer's W in the table and the agency's per-cycle Wh by their own item names.
A 20kg drying capacity doesn't mean the spec table tells you to put in any wet laundry up to that weight. Check the manual for that model for dryable materials and load conditions by course. An efficiency comparison doesn't stand in for whether a fabric can be dried.
Will it fit in your space?
The two candidates have the same body size and door-open depth. If you put them in the same spot, just compare the 20kg and 19kg capacities for what you need first; there is no basis for saying the 20kg model fits a narrower space. Don't measure only the 820mm body depth. Check the 1,380mm depth with the door open and the separate spare installation space too. If the passage in front is narrow, look even more carefully at both models.
If you plan to stack it on a washing machine, don't assume they are compatible just because the sizes are similar. You need installation parts and the manufacturer's installation conditions that fit that combination. Settle the washing capacity you need first in how to read a washing machine label, then check the dryer capacity and installation conditions separately, and the candidates are easier to narrow down.
Product information
Candidates compared
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LG Tromm Dryer RD20WNA
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LG Tromm Dryer RH18VTLN
Check price and stock at the link. Product information is as of the date checked.
Frequently Asked Questions
If the manufacturer and the agency show different grades, which one do I write down?
Look at each source's value separately and check the label on the product on sale. In this check, the RD20WNA and RH19VTLN were grade 1 from the manufacturer but grade 2 in the agency's registered row.
If it says 950W, does it use 0.95kWh per cycle?
No. Power consumption in W and per-cycle energy in Wh are different items. You cannot convert between them without the run time and operating state.
Can I install it if I only measure the body depth?
You also need the depth with the door open and the spare installation space. The official door-open depth for both candidates is 1,380mm.
Sources & Verification Date
- Korea Energy Agency Energy Efficiency Management System Product Search · Verified
- LG TROMM Dryer RD20WNA Official Manufacturer Specifications · Verified
- LG TROMM Dryer RH19VTLN Official Manufacturer Specifications · Verified
All materials have been verified from official announcements and may have changed since verification.