Every commercial convection oven gets a score from 0 to 100% built from seven factors, which maps onto the 5-point rating shown on the site (a 0% score would be 1.5 stars; a perfect score, 5). Each factor is scored against fixed reference points, not against the other products in the list, so adding a new model never moves another model’s rating. Ovens are grouped by type: quarter and half-size countertop, full-size electric and full-size gas. Capacity and power use reference points set for each group.
| Factor | Measures | Weight |
|---|---|---|
| Capacity | sheet pans held at once, in full-size pan equivalents | 25% |
| Power | heating power in kW, or burner input in BTU/hr for gas | 15% |
| Top temperature | highest thermostat setting | 10% |
| Features | steam or humidity, programmable controls, fan, light and door glass | 15% |
| Listing | sanitation (NSF or ETL Sanitation) and safety (UL, ETL, CSA or MET) listing | 15% |
| Warranty | parts and labor warranty | 10% |
| Value | price per full-size pan of capacity | 10% |
Where the numbers come from
Pan capacity, racks, power, temperature range, controls, electrical needs, dimensions, listings and warranty come from the maker’s spec sheet, manual or product page, or from the maker’s own copy on a retail listing where no spec sheet is published. Prices are checked at the stores each page links to, and the lowest price is used.
The factors
Capacity is the number of sheet pans the oven holds at once, counted in full-size (18 x 26 in) pan equivalents: a half-size pan counts as half and a quarter-size pan as a quarter. In the countertop group, 0.75 (three quarter-size pans) scores zero and 2 (four half-size pans) full marks. In both full-size groups, 3 pans scores zero and 6 full marks. When a maker gives only the number of racks, one pan per rack is assumed and the factor is marked estimated.
Power is the rated heating power. In the countertop group, 1.4 kW scores zero and 4 kW full marks. For full-size electric ovens, 3.5 kW scores zero and 12 kW full marks. For gas ovens, 40,000 BTU/hr scores zero and 70,000 BTU/hr full marks. On dual-voltage models the rating at the higher voltage is used.
Top temperature is the highest thermostat setting: 400 F scores zero and 550 F full marks.
Features add up five cooking features: steam injection or humidity control (30%), programmable controls with stored programs (20%), a two-speed or auto-reversing fan (20%), an interior light (15%) and double-pane door glass (15%). A feature the maker doesn’t mention is counted as absent.
Listing is 60% a sanitation listing (NSF or ETL Sanitation) and 40% a safety listing (UL, ETL, CSA or MET). CE marking alone doesn’t count, since it isn’t a US listing.
Warranty is half the labor term and half the parts term, each scored from no warranty (zero) to 3 years (full marks).
Value is the price per full-size pan of capacity, on a log scale: $2,000 per pan scores zero and $250 per pan full marks.
What isn’t scored
Cavity capacity in cubic feet, inside and outside dimensions, rack positions, timer length, the low end of the temperature range, voltage, current draw and plug, number of doors, interior material, weight, energy certifications and release date are listed but not scored.
Missing data
Pan capacity separates these ovens more than anything else, so an oven whose maker publishes neither a pan count nor a rack count, or doesn’t say which pan size fits, gets no capacity counted: that factor scores zero and is marked estimated. Warranty and listing work the same way: a maker that doesn’t publish a warranty, or any listing mark, gets none counted, and the factor scores zero. For power, top temperature and value, a figure that isn’t published gets the neutral middle score (50) and the product page marks it as estimated.
Ties and discontinued models
Products are ranked by score within each group. Discontinued models stay listed but rank below every current model and can be hidden with the “Hide discontinued” filter.