Summit 18” Microwave
- Countertop Microwave Oven
- 0.7 cu ft
- 700 watts
- Touch
A small, well-equipped microwave whose built-in outlet allocator solves a real single-outlet problem, useful wherever counter and plug space are both scarce.
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How it ranks among the 85 countertop microwave ovens we track
0 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 85 countertop microwave ovens we track - how the scorecard works · full countertop microwave ovens data report. Confidence: limited - limited rating history.Last refreshed Jun 13, 2026. Data-computed, not a hands-on test. Compiled by the ProductDome Research Team.
Overview
The Summit SM903BSA1 is a compact 0.7 cu ft countertop microwave in black, sized at just under 18 inches wide, with a rear power allocator that lets a second appliance share its outlet.
The allocator is the unusual feature here: it accepts a 2 or 3-prong cord from something like a mini fridge or lamp and temporarily cuts power to that device while the microwave runs, so one wall outlet can serve two appliances. Everything else is standard compact microwave fare, one-touch settings, defrost, cook by weight, and an eco mode that dims the display.
- 0.7 cu ft capacity in a 17.88 inch wide footprint
- Built-in allocator for 2 or 3-prong pass-through power
- Multi-stage cooking combines several functions
- Eco mode display dimming and muted alerts
Who it's for
Good for a dorm, office, or small kitchenette where outlet access is limited and counter space is tight. Not a fit for anyone wanting a larger capacity microwave for regular family cooking.
Strengths and trade-offs
Drawn from this product's published specifications.
- Rear allocator lets one outlet run the microwave and another appliance
- Removable glass turntable and white interior are easy to wipe down
- Eco mode dims the display and can mute end-of-cycle alerts
- One-touch presets and cook-by-weight cover common reheating tasks
- 0.7 cu ft capacity limits it to small plates and single servings
- No published rating or review data to confirm long-term reliability
Performance notes
The digital panel handles one-touch presets for pizza, popcorn, and reheating alongside multi-stage cooking that chains different functions in sequence, and the interior is a plain white finish with a removable glass turntable for cleaning.
Specifications
| Brand | Summit Appliance |
|---|---|
| Model | SM903BSA1 |
| Dimensions & fit | |
| Item Weight | 35 pounds |
| Item Dimensions D x W x H | 12.1 × 17.9 × 10.4 inches |
| Turntable Diameter | 9.5 inches |
| Capacity & performance | |
| Capacity | 0.7 cu ft |
| Defrost System Type | Auto Defrost |
| Heating Method | microwave radiation |
| Power & efficiency | |
| Wattage | 700 watts |
| Voltage | 115 volts |
| Energy Consumption | 700 Watts |
| Power Consumption | 700 Watts |
| Construction & materials | |
| Material Type | Metal |
| Inner Material | Metal |
| Color | Black |
| Compatibility & installation | |
| Installation Type | Countertop |
| Human Interface Input | Touchscreen |
| Included components | |
| Unit Count | 1 |
| Included Components | Turntable |
| Other details | |
| Control Type | Touch |
| Number of Programs | 11 |
| Cooking Program | Auto Defrost, Express Cooking, Pizza, Popcorn, Potatoes |
| Timer Function | Timer Function Available |
| Item Type Name | Microwave |
| Additional Features | Specialty 1-touch cooking options |
| Frequency | 60 Hz |
| Recommended Uses For Product | indoor |
Other Summit Appliance countertop microwave ovens
How it compares
This product against the closest alternatives we track in countertop microwave ovens.
| Product | Amazon rating | Ratings | ProductDome score |
|---|---|---|---|
| Summit 18” MicrowaveThis product | - | - | 2.7 / 5 |
| COMFEE' EM720CPL-PMB Countertop Microwave Oven with Sound On/OffCOMFEE' | 4.4 / 5 | 28,000 | 4.4 / 5 |
| Panasonic Microwave Oven NN-SN686S Stainless Steel Countertop/Built-In with Inverter…Panasonic | 4.3 / 5 | 8,400 | 4.4 / 5 |
| Nostalgia RMO4BK Retro 0.9 Cubic Foot 800-Watt Countertop Microwave OvenNostalgia | 4.6 / 5 | 1,200 | 4.4 / 5 |
| TOSHIBA EM131A5C-BS Countertop Microwave Ovens 1.2 Cu FtTOSHIBA | 4.4 / 5 | 32,299 | 4.3 / 5 |
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Questions about the Summit Appliance SM903BSA1
Common buyer questions answered straight from the product spec data - no fluff, no "it depends".
What does the allocator on the Summit SM903BSA1 do
It is a rear outlet that accepts a 2 or 3-prong plug from another device, such as a mini fridge or lamp, and temporarily shuts that device off while the microwave is running.
What is the capacity of the SM903BSA1
It has a 0.7 cu ft (20 L) interior capacity.
Does the SM903BSA1 have a removable turntable
Yes, it has a removable glass turntable for easier cleaning.