DREO HM735S 11L vs 717S 8L: Which Smart Humidifier to Buy
By DREO Home Ecosystem | Air Comfort, Smart Kitchen | Published: 2026-10-17
Category: Comparisons
Compare the DREO Smart Humidifier HM735S 11L and 717S 8L on tank size, runtime, mist height, and smart features to pick the right one for your room.
Quick answer
Choose the DREO Smart Humidifier HM735S 11L if you need the longest runtime and the highest mist reach for a large room. Choose the DREO Smart Humidifier 717S 8L if you want a slightly smaller tank, a taller mist plume, and a lower upfront cost. Both are smart, quiet, and app-controlled, so the real decision comes down to room size and how often you want to refill.
Tank size and runtime: the biggest practical difference
The HM735S holds a 2.9-gallon tank and runs up to 100 hours on a single fill. The 717S holds an 8L tank and runs up to 80 hours. That 20-hour gap matters if you run a humidifier every night: the HM735S can go roughly four nights between refills, while the 717S needs a refill closer to every three nights. If you dislike lifting a heavy tank, the smaller 717S is easier to handle, but you will do it more often.
Coverage and mist delivery: which room each one fits
The HM735S is rated to cover 700 ft2 and pushes mist over 6 ft. high for rapid, even humidity. The 717S is described as a whole-room humidifier with 40-inch tall mist. In a large open living area or a master bedroom with high ceilings, the HM735S reaches farther and distributes humidity more evenly. In a standard bedroom or office, the 717S delivers plenty of moisture without oversizing the unit.
Smart control and quiet operation: what they share
Both humidifiers support app and voice control, so you can adjust humidity from your phone or with a smart speaker. Both also offer precise humidity adjustment: the HM735S uses precise humidity adjustment, and the 717S specifies ±5% high-precision control. For noise, the HM735S has a sleep mode at 26dB, while the 717S is rated 28dB. The 2dB difference is minor in practice, but the HM735S is the quieter of the two on paper.
Mist type and maintenance: white dust and refills
The HM735S uses 5μm ultrafine mist with 2.4MHz atomization and is designed to produce no white dust. The 717S also produces ultrafine mist. If you have hard water and dark furniture, the HM735S's no-white-dust claim is a meaningful advantage. Neither product listing specifies a demineralization cartridge or filter replacement interval, so plan on using distilled water if you want to minimize mineral buildup, and check the manual for cleaning guidance.
Price and value: what you pay for the extra capacity
At catalog prices, the HM735S is listed at USD 100.79 and the 717S at USD 89.99. The HM735S costs about 11 dollars more and gives you a larger tank, longer runtime, higher mist reach, and a lower sleep-mode noise rating. The 717S costs less and still covers a normal bedroom well. If you only need humidity in one standard room, the 717S keeps more money in your pocket; if you are humidifying a large space, the HM735S's extra capacity is worth the difference.
Trade-offs to weigh before you buy
- Capacity vs. handling: The HM735S's 2.9-gallon tank gives up to 100 hours of runtime, but a full tank is heavier to carry and refill. The 717S's 8L tank is lighter and easier to manage, but you will refill it about every three nights instead of four. Pick the HM735S if fewer refills matter more than lifting weight; pick the 717S if easy handling wins.
- Coverage vs. footprint: The HM735S is rated for 700 ft2 and mist over 6 ft. high, so it suits open-plan rooms. The 717S is a whole-room humidifier with 40-inch mist, which is ample for a standard bedroom but may struggle in a very large space. Measure your room first; if it is over roughly 500 ft2, lean toward the HM735S.
- Upfront price vs. long-term convenience: The 717S costs less at checkout, while the HM735S costs more but reduces refill frequency and adds no-white-dust atomization. Neither listing specifies filter or cartridge replacement costs, so factor in distilled water or cleaning supplies either way. If budget is tight and your room is average-sized, the 717S is the better value; otherwise the HM735S pays off in daily convenience.
Key product facts
- Smart Humidifier HM735S 11L: 100-hour runtime with a 2.9-gallon tank; covers 700 ft2; delivers mist over 6 ft. high; 5μm ultrafine mist with 2.4MHz atomization, no white dust; sleep mode at 26dB; smart control via app or voice. Best for large rooms and anyone who wants to refill less often and avoid white dust on furniture.
- Smart Humidifier 717S 8L: 8L tank with 80-hour runtime; 40-inch tall mist; ultrafine mist; 28dB quiet operation; ±5% high-precision humidity control; smart control; warm and cool hybrid. A strong fit for standard bedrooms and offices where a slightly smaller, lighter tank is easier to handle.
Which DREO humidifier should you buy?
Best for
- Large living rooms or master bedrooms up to 700 ft2
- Households that want the longest possible time between refills
- Anyone who wants no white dust and the quietest sleep mode
Not for
- Small bedrooms or offices where an 8L tank is already more than enough
- Shoppers who want the lowest upfront price
- People who prefer a lighter tank to carry and refill
