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About the scoresThe scores are calculated mechanically by applying the criteria table at the end of the page to figures published on the manufacturers' official pages and manuals (and on retail or comparison pages where an official figure was not available). We call it the "Spec Score".
Dainichi HD-C500H-H
Image: Amazon product photo
Spec Score #2Hybrid (evaporative + warm-air evaporation)

Best for quiet humidifying in a bedroom

4.30★★★★☆Spec Score (out of 5)
See on Amazon¥19,000See on Rakuten¥18,650Price as of 2026-09-09 · affiliate link · Opens the shop's site

Score Breakdown

Humidifying power4 / 5
Care4 / 5
Quietness5 / 5
Energy use5 / 5
Extra features4 / 5

Specs

MethodHybrid (evaporative + warm-air evaporation)
Room coverageWood-frame 8.5 tatami mats / Prefab 14 tatami mats
Max output500 mL/h
Tank capacityabout 4 L
Continuous run timeStandard 8.0 h / Quiet 10.7 h / Eco 11.0 h
Operating noiseQuiet mode up to 20 dB (Standard and Eco: 30 dB)
Power consumptionEco 11/12 W (50/60 Hz); Standard 163 W
CareWash filter and tray every 2 weeks / Antibacterial filter replaced every 5 seasons
Extra featuresHumidity-set auto mode, off-timer (2/4 h), child lock
Size / weight375 × 375 × 190 mm (as listed by the maker), about 4.5 kg

🙂 Good points

  • Quiet mode is 20 dB at most
  • Coverage is 8.5 tatami mats wood-frame / 14 prefab
  • Filter replacement only every 5 seasons

🙁 Things to note

  • In Quiet mode the max output drops to 375 mL/h (500 mL/h in Standard)
  • The maker advises washing the filter and tray every two weeks

Sources

Product page / Spec sheet (PDF)
Scores are calculated only from specs published on official and retail pages.

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