De'Longhi Dragon Digital TRD40615E / TRD40615EBK vs Dreo Solaris Slim H3 (DR-HSH003)
De'Longhi Dragon Digital TRD40615E / TRD40615EBK
The short answer
Dreo Solaris Slim H3 (DR-HSH003) comes out ahead overall with 8.0/10 against 7.7/10 for the De'Longhi Dragon Digital TRD40615E / TRD40615EBK. De'Longhi Dragon Digital TRD40615E / TRD40615EBK is stronger on noise & sleep-friendliness, safety and health & materials. Dreo Solaris Slim H3 (DR-HSH003) is stronger on heating performance, bedroom usability and value. At current verified prices, the Dreo Solaris Slim H3 (DR-HSH003) costs about $114.96 less.
- Choose the De'Longhi Dragon Digital TRD40615E / TRD40615EBK if: Very light sleepers who want no fan noise or air movement, and can accept a heavy unit and slow warm-up.
- Choose the Dreo Solaris Slim H3 (DR-HSH003) if: Shoppers who want a measured-quiet heater with a remote, a 1°F digital thermostat and a sleep timer for under $70.
Scores by criterion
| Criterion | De'Longhi Dragon Digital TRD40615E / TRD40615EBK | Dreo Solaris Slim H3 (DR-HSH003) |
|---|---|---|
| Noise & Sleep-Friendliness | 9.0No fan. Bob Vila calls it virtually silent (subjective), with occasional clicks. | 8.6Bob Vila measured 37.5 dB. ECO mode reduces cycling. |
| Safety | 8.2Thermal cut-off, tip-over switch and child lock. | 7.8ETL-certified per Amazon's title, with tip-over and 122°F overheat cutoffs. |
| Heating Performance | 6.8Even radiant heat but a slow warm-up. One Walmart reviewer found it weak. | 7.3Good in small to medium rooms. NBC Select says it is not great for large ones. |
| Bedroom Usability | 6.8Digital controls and a 24-hour timer, but heavy, with a dim display and no remote. | 8.41°F digital thermostat, 12-hour timer, remote and slim body. Bob Vila found the controls less intuitive. |
| Health & Materials | 8.0No blower moving dust and a sealed oil reservoir. Faint odor on first use. 3-year warranty. | 5.5Fan-forced. 1-year warranty. |
| Value | 6.0$189.95 is expensive. | 8.9$67.46 for the most fully featured, test-winning heater in the lineup. |
Specifications
| Spec | De'Longhi Dragon Digital TRD40615E / TRD40615EBK | Dreo Solaris Slim H3 (DR-HSH003) |
|---|---|---|
| Heater type | Oil-filled radiator | PTC ceramic, oscillating |
| Fanless (no blower) | Yes | No |
| Manufacturer-rated noise | — | 37.5 dB |
| Tip-over shutoff | Yes | Yes |
| Overheat protection | Yes | Yes |
| Safety listing (ETL/UL) | — | ETL |
| Thermostat type | Digital (ECO) | Digital, 1°F steps (41–95°F) |
| Max timer | 24 hours | 12 hours |
| Remote control | No | Yes |
| Warranty | 3 years | 1 years |
| Weight | 25.61 lb | 4.63 lb |
De'Longhi Dragon Digital TRD40615E / TRD40615EBK
Pros
- No fan noise or air movement
- 24-hour timer and child lock
- Tip-over switch and thermal cut-off
- 3-year warranty
- Sealed oil reservoir needs no refilling
Cons
- About 26 lb
- Slow to warm a room
- Faint odor on first burn-in
- Premium price, no remote
The right pick for very light sleepers who value silence above all. Run it once in a ventilated room first, then enjoy steady, quiet heat.
Full De'Longhi Dragon Digital TRD40615E / TRD40615EBK review →Dreo Solaris Slim H3 (DR-HSH003)
Pros
- Measured at 37.5 dB by Bob Vila
- 1°F digital thermostat, 12-hour timer and remote
- Tip-over shutoff and 122°F overheat cutoff
- Slim, light body with 70° oscillation
- Budget-friendly price
Cons
- 1-year warranty
- Weaker in large rooms, per NBC Select
- Controls less intuitive than some rivals, per Bob Vila
The best choice for small to medium bedrooms when you want control from the bed. It is quiet, well equipped and inexpensive, with a short warranty as the main drawback.
Full Dreo Solaris Slim H3 (DR-HSH003) review →Both products are part of our guide The Best Quiet, Safe Space Heaters for Bedrooms of 2026, where you can see every pick, how we score and current prices from each retailer.