COSMO COS-30EDWC 30 in. Haven Collection Double Electric Wall Oven
- Double Wall Oven
- 5 cu ft
- 4800 watts
- Electric
- More reviewed than 92%
A capacious double convection oven that cooks fast once dialed in, but budget time for calibration and inspect it closely on delivery.
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How it ranks among the 44 double wall ovens we track
4.0★ across 37 Amazon ratings, Bayesian-smoothed toward the category average.
37 Amazon ratings, weighted on a log scale so huge counts don't drown everything.
Brand identity, imagery, description and spec coverage.
The ProductDome score is separate from the Amazon rating shown above: it combines the Bayesian-smoothed Amazon rating with evidence volume, tracked demand, and data quality across the 44 double wall ovens we track - how the scorecard works · full double wall ovens data report. Confidence: medium - useful but incomplete evidence.Last refreshed Jun 13, 2026. Data-computed, not a hands-on test. Compiled by the ProductDome Research Team.
Overview
A 30 inch double electric wall oven from Cosmo's Haven Collection, pairing a 5 cu ft true European convection oven on top with a 5 cu ft standard-bake oven below, self-cleaning, in stainless steel with a blue porcelain interior.
Hardwired at 240V and 4800 watts, this is built for a kitchen remodel rather than a drop-in swap. Reviewers describe it as running hot and fast like a commercial unit, and several needed to recalibrate the set temperature after installation.
- Two 5 cu ft ovens, top with true convection
- 7 cooking functions on the upper oven
- Automatic self-clean cycle
- Hardwired 4800W, 240V connection
Who it's for
Households remodeling a kitchen who want two full-size ovens for entertaining and can arrange a 240V hardwire connection and custom cabinet. Not a fit for anyone wanting a simple plug-in replacement.
What buyers say
From Amazon customer reviews.
Owners who received undamaged units call the fit, finish, and cooking performance a clear step up from their old ovens, with several specifically praising the large interior and quiet operation. The recurring complaints are shipping damage on arrival (cracked glass, dented door panels) and units that run hotter than the set temperature, with at least one buyer needing extended back-and-forth with Cosmo support to sort out calibration.
Strengths and trade-offs
Drawn from this product's published specifications.
- Two 5 cu ft cavities handle multiple dishes or a crowd-size meal
- Convection roast browns and cooks food quickly per owners
- Self-clean and a hidden bake element ease upkeep
- Multiple reports of shipping damage including broken glass and dented doors
- Some units run noticeably hotter than the set temperature and need recalibration
- Large doors mean stepping aside to load and unload hot dishes
Performance notes
True European convection circulates heat to cook at roughly 25 degrees cooler and about 10 percent faster than a standard oven, with automatic convection conversion so recipes don't need manual adjustment. The top oven offers seven functions including proof and convection roast.
Specifications
| Brand | COSMO |
|---|---|
| Model | COS-30EDWC |
| Dimensions & fit | |
| Item Weight | 236.5 pounds |
| Item Dimensions D x W x H | 23.5 × 29.9 × 51.2 inches |
| Door Orientation | Side |
| Capacity & performance | |
| Capacity | 5 cu ft |
| Defrost System Type | Electric Defrost |
| Heating Method | Convection |
| Power & efficiency | |
| Wattage | 4800 watts |
| Fuel Type | Electric |
| Voltage | 240 volts |
| Construction & materials | |
| Material Type | Stainless Steel, Enamel-Coated Steel |
| Color | Stainless Steel |
| Finish Types | Stainless Steel |
| Compatibility & installation | |
| Installation Type | Wall Mount |
| Included components | |
| Included Components | 3 Racks, Drip / Broiler Pan, Installation Kit, Power Cord |
| Warranty & support | |
| Warranty Description | 1 year |
| Other details | |
| Additional Features | 7 Cooking Modes, Turbo True European Convection (Top Oven), Standard Bake (Bottom Oven), Probe Cooking, Self-Cleaning, Sabbath Mode |
| Timer Function | Timer Function Available |
How it compares
This product against the closest alternatives we track in double wall ovens.
| Product | Amazon rating | Ratings | ProductDome score |
|---|---|---|---|
| COSMO COS-30EDWC 30 in. Haven Collection Double Electric Wall OvenThis product | 4.0 / 5 | 37 | 3.8 / 5 |
| KoolMore 30-Inch Electric Double Wall Oven with QuietKoolMore | 4.2 / 5 | 30 | 3.6 / 5 |
| SAMSUNG 30" Smart Double Wall Oven w/Steam CookSamsung | 4.5 / 5 | 11 | 2.7 / 5 |
| Rangaire RWOD301GS 30" Glass Touch Double Wall OvenRangaire | 4.8 / 5 | 7 | 2.7 / 5 |
| Frigidaire 30" Double Wall Oven with Fan ConvectionFrigidaire | 3.0 / 5 | 6 | 2.7 / 5 |
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Questions about the COSMO COS-30EDWC
Common buyer questions answered straight from the product spec data - no fluff, no "it depends".
Does the Cosmo COS-30EDWC need a special electrical hookup?
Yes, it is hardwired and requires a 4800 watt, 240V circuit, plus a cabinet cut for its 29.87 x 23.5 x 51.18 inch dimensions.
Does the top oven run hotter than the dial setting?
Some owners report it does and had to adjust the built-in calibration setting; one reviewer notes the calibration direction feels counterintuitive and is not explained in the manual.
Is the COS-30EDWC self-cleaning?
Yes, both the convection details and owner reports confirm an automatic self-clean cycle that burns off spills at high heat.