Our verdict
Pick the Coway Airmega 100 if it is the cheaper of the two on the day you buy. Pick the Blueair Blue Pure 511 if you want the lower price.
The central trade-off
Rated room size. Blueair Blue Pure 511 states 189 sq ft; the other's maker page doesn't.
Power draw. Coway Airmega 100 states 25 W; the other's maker page doesn't.
Filters. Coway Airmega 100: HEPA.
Filters. Blueair Blue Pure 511: HEPASilent.
Price. When we checked, the Blueair Blue Pure 511 listed for less ($100 against $130); prices move, so check both buttons.
Side by side
| Specification | Coway Airmega 100 | Blueair Blue Pure 511 |
|---|---|---|
| Rated room size | Not stated by the maker | 189 sq ft |
| Smoke CADR | Not stated by the maker | Not stated by the maker |
| CADR | Not stated by the maker | Not stated by the maker |
| Quietest setting | Not stated by the maker | Not stated by the maker |
| Noise | 20 dB | Not stated by the maker |
| Power draw | 25 W | Not stated by the maker |
| Filters | HEPA | HEPASilent |
| Warranty | Not stated by the maker | 1 years |
Values are the makers' published specifications. "Not stated" means the maker doesn't publish it.