Search for Dreo space heater decibels and every Dreo page seems to have a number. That is nearly true: 22 of the 27 heaters Dreo listed on dreo.com on October 6, 2026 carry a decibel figure, from 25 dB to 40dB. What most pages do not tell you in their text is which setting the figure describes. For nine fan heaters, Dreo does say, but only in a footnote inside a product image.
This guide lists every current US Dreo space heater with a published figure, quotes each one with the condition Dreo attaches to it, and ranks only figures at the same kind of setting. We do not rank Dreo against other brands here; for how it compares, see our quietest space heaters guide.
Our picks are listed above, with full specifications for each.
Dreo publishes heater noise figures in five places, and each carries a different amount of context.
- Bullets and descriptions. "25dB Ultra-Quiet Operation" on the 725, "HyperSilent™ 34 dB Whisper-Quiet" on the Whole-Room Heater 517, "40dB quiet performance" on the Solaris Slim H3. No setting is named in any of them.
- Specification tables. "Noise Level (dB): 25" on the 725, "Sound Level: 37.5 dB" on the Atom One and Solaris Slim H3, "Sound Level: 32 dB" on the Solaris Max (2nd Gen.), and "Sound Level: Silent" on the two digital oil-filled radiators.
- The collection comparison table. The heaters collection page ends with "Which Heater Is Best for You?", a table with a "Noise level" row for 11 heaters: nine fan heaters from 25dB to 37dB, and 0 for two radiators.
- The series page. Dreo's whole-room heater page for the 720 and 725 prints "HyperSilent™ 25 dB" with the footnote "Tested at the lowest airflow heat setting." This is the only place a setting appears in page text.
- Product images. Most of the useful detail is here. We ran all 691 product images across the 28 listings through text recognition, then viewed every one that showed a figure. Most fan heater pages carry their figure in an image, and eleven pages footnote the test setting there, nine of them fan heaters.
Every Dreo figure is plain dB. Dreo never writes dBA, never states a measuring distance and never names a test standard. Our explainer on why decibel ratings rarely compare across brands covers why that matters, and dBA explained covers the weighting Dreo leaves out.
Nine fan heaters have a footnote naming the setting. The wording varies: "lowest heat settings" on the 725, 720, 517 and Atom One, "lowest speed setting" on the 517S, 517AS, 525 and 714, and "lowest setting" on the Solaris Max. Each describes Dreo's own lab test at the bottom of the range, so we rank them together, with that difference in wording noted.
- Whole-Room Heater 725 (DR-HSH035): 25 dB. $79.99, gray in stock.
- Whole-Room Heater 720 (DR-HSH040): 25 dB, "In Sleep Mode" per its image. $119.99, sold out.
- Smart Wall-mounted Heater 517S: 28 dB. $99.98 white, $99.99 black, in stock.
- Smart Wall-mounted Heater 517AS with ALCI Plug: 28 dB. $119.99, in stock.
- Whole-Room Heater 517 (DR-HSH037A): 34 dB. $79.99, white in stock.
- Heater Solaris 525: 34 dB. $89.99, in stock.
- Whole-Room Heater 714: 34 dB. $99.99, sold out in all three colors.
- Heater Atom One: 37 dB in the image, 37.5 dB in the specification table. $49.99, silver and white in stock.
The Solaris Max (2nd Gen.) belongs in this group on its image, which says 25dB with "Test conducted internally by Dreo's lab at the lowest setting", but its specification table says 32 dB, so we leave it out of the order. The lowest speed footnote on the 517S, 517AS, 525 and 714, "Tested under internal laboratory conditions at lowest speed setting", is word for word the line Dreo uses on its Pilot Max S tower fan, so the wording may be a template rather than a description of each heater's controls.
Eleven more fan heaters print a single number with no setting. Dreo's FAQ says "The higher the gear setting of the space heater, the louder the noise will be", so these are most likely low-setting figures too, but Dreo does not say, and we keep them apart from the list above.
- Tower Heater 718: 25dB in three images and the comparison table. $129.99, in stock.
- 2-in-1 Tower Fan & Heater 706: 25dB in images and the comparison table, heat or fan not stated. $169.99, in stock.
- Nine heaters at 34dB, listed cheapest first because the figure cannot separate them: Heater Atom 416 ($44.99, sold out), Heater 320 ($49.99), Heater 322 ($53.99, sold out), Heater Atom Core ($54.99), Ceramic Heater 319 ($69.99, "noise levels as low as 34dB"), Heater Solaris Slim H2 ($69.99), Heater Solaris 628 ($74.99), Whole-Room Heater 715 ($99.99) and the Smart Wall-Mounted Heater 719S ($129.99, comparison table only).
The 719S is worth a note. Its page text says it "delivers warmth with lower noise" at night and dims its LED panel in low light, but its only figure, 34dB, comes from the comparison table, with no setting. The 517S beside it in that table lists 28dB, and its own images tie that to the lowest speed setting.
Pages that disagree with themselves
Four Dreo heaters print more than one figure.
- Solaris Max (2nd Gen.). 25dB in the description, the images and the comparison table; 32 dB in the specification table.
- Solaris Slim H3. "40dB quiet performance" in the bullets, 37.5 dB in the specification table and 34 dB in two images. Our space heater guide set the H3 aside for this reason.
- Ceramic Heater 316. 37dB in the comparison table; an image headed "Only Dreo can go beyond the quiet" shows "New 34dB" against "Old 38dB" and "Others 42dB".
- Atom One. 37 dB in the image and the comparison table, 37.5 dB in the specification table. Half a decibel is too small to matter, so we still rank it.
The images make claims about other brands, too. The Solaris Max and 316 images plot "Others" at 42dB, and the Ceramic Heater 319 image plots a "whisper" at 41dB and "traditional" heaters at 42dB, without saying what was measured. We quote them as Dreo's claims and use none of them.
Dreo sells two convection heaters and three oil-filled radiators, and none has a measured figure. The Convection Heaters 711 and 711S say "HyperSilent™ 0dB Unheard Quietness", and an image footnotes the 0dB as "Tested by DREO lab, using DR-HSH041S at the lowest heat settings." The Oil-filled Radiators 521 and 310 list "Sound Level: Silent", Dreo's comparison table gives the 521 and 153 a noise level of 0, and the 153's images say "Noise-free Heat. Sound Sleep." beside a scale running from "Falling Leaves" at 10dB to "Whisper" at 30dB, with Dreo's dot between them and no number.
With no fan there is no fan noise, but 0 dB is the threshold of hearing, not a test result, and we rank no fanless claim against a fan heater figure. For what Dreo, De'Longhi and others say about clicks and slow heat-up, see our guide to the quietest oil-filled radiators.
What Dreo says makes its heaters quiet
Dreo names its quiet design in images more than in text. Many compact heaters, including the Atom One, 320, 319, 316, 322 and Slim H2, show the same panel: "Upgraded Noise Reduction" from a "Next-gen DC Motor" or "Premium DC Motor" and a "New Winglet Design". The 517 and 525 credit a "Brushless DC Motor", the 517 with "Less Friction. More Quietness." The 706 says "Powered by TurboSilent".
The Solaris Slim H3 has its own claim in text: "Dreo proprietary ObliqueAirlow Technology greatly reduces the noise of the airflow travelling through the fan wheel, delivering warm breezes 11% quieter than traditional space heaters." Dreo does not say what the 11% is measured against. The Atom One promises that its "Exclusive trackball system provides smoother and quieter oscillation than traditional oscillating space heaters."
These are the same ideas Dreo uses on its fans, and our Dreo fan decibels guide found the same habit there: design claims in detail, figures with little context.
What the numbers mean in a room
Decibels are logarithmic, and roughly every 10 dB sounds twice as loud. By Dreo's own figures at the lowest setting, the Atom One at 37 dB would sound a little more than twice as loud as the 725 at 25 dB, a 12 dB gap. The Solaris Max's two figures, 25 and 32 dB, are 7 apart for the same heater, which is the size of the uncertainty in a single Dreo number. Our decibel chart puts 25 to 40 dB beside a whisper and a quiet room.
Every figure describes the bottom of the range. A fan heater in a cold room runs at its top setting, and Dreo publishes nothing there. In a bedroom or office that is already warm, the thermostat matters more: Dreo's FAQ says "In ECO mode, the heater automatically turns off once the set temperature is reached", which means you will hear it start and stop. Our bedroom heater guide covers that cycling, and our home office heater guide covers heaters that sit under a desk.
Stock and price on the day we checked
We checked every price on dreo.com on October 6, 2026. Fan heaters with a figure ran from $39.98 for the 316 in silver to $169.99 for the 706. Four were sold out in every color: the Whole-Room Heaters 720 and 714, the Heater Atom 416 and the Heater 322, the last listed at $53.99 against a regular price of $99.99. The 725 and 517 were sold out in black, and the Atom One in black, with other colors in stock. Dreo's pages state a 12 month warranty.
How we chose
We read Dreo's US space heater collection, which listed 28 product pages on October 6, 2026, two of them the Solaris Slim H2 in different colors, so 27 heaters. For each we recorded every decibel figure in the bullets, description, specification table and FAQ, the figure in the collection comparison table, the price and the stock, and we ran text recognition over all 691 product images, then viewed every image with a figure and its footnote ourselves. We opened seven of Dreo's support pages for its heaters; they repeat the noise FAQ and give no figure, and the manuals linked there gave no decibel figure in their searchable text. We grouped figures by the condition Dreo names, ranked only within a group, and set aside any heater whose own page gives two figures that differ by more than a rounding step.
We did not measure any of these heaters. Every figure here is Dreo's own, quoted from dreo.com in Dreo's words and unit, and Dreo states no measuring distance, no weighting and no test standard for any of them.
