The Frigidaire FMOS1846BB delivers 1.8 cu ft and 1500W of power in a black finish at $299, a strong spec-to-price ratio, but its unusual 20-inch width makes it a specialized fit rather than a standard replacement, and 42 reviews is a modest base for a $299 commitment.
Kitchens with a 20-inch range or compact cooking space that need a high-wattage OTR microwave with a large interior. At 1500W and 1.8 cu ft, it outperforms many larger units on raw power.
Skip if
Anyone with a standard 30-inch range opening, this unit at 20 inches wide will not fit a standard OTR mounting space. Buyers who need a black finish in a standard 30-inch width should look elsewhere in the Frigidaire lineup.
Capacity 1.8 cu ft
Wattage 1500 W
Power levels 10
Installation Over-The-Range
Width 20.0 in
Color Black
Priced 31% below the category median ($431.77 across 38 tracked models)
Capacity of 1.8 cu ft - larger than 79% of the 38 models we track
Wattage of 1500 W - higher than 86% of the 38 models we track
Our scorecard
4.2/5overall
Owner rating4.4/5
4.4 average across 42 owner ratings
Value for money4.6/5
$166 per cubic foot, below the category median
Popularity2.9/5
42 owner reviews, more than most models here
Storage space4.3/5
1.8 cu ft, roomy for this category
The overall score is owner satisfaction weighted by how many reviews back it, so a high rating from few reviews counts for less. The bars below show where this model stands against the other kitchen ranges, cooktops, wall ovens, range hoods and microwaves we track in this category on price, popularity and size. Context, not marks against it, and our read of the data, not a lab test.
Overview
The FMOS1846BB's most notable attribute is 1500W of output power combined with a 1.8 cu ft interior at $299. That combination, high wattage, large interior, accessible price, is competitive. Frigidaire's OTR lineup has earned a solid reputation across its FFMV series, and the 4.4-star rating from 42 buyers suggests this specific model continues that trend.
The defining constraint is width: at 20 inches, this unit is designed for a compact or non-standard kitchen space rather than the 29.75-30 inch cutout that dominates OTR installations. The overall dimensions of 33 x 20 x 19 inches confirm a taller-than-typical profile as well. Buyers with a 20-inch range will find this one of very few high-spec options available; buyers with a 30-inch range should not purchase this unit.
With 10 power levels and a black color, it suits kitchens with black appliance suites. Controls information is not listed, which is a minor gap in the published specs. At 61 lb, installation weight is standard for a microwave with this power output. Frigidaire's service network is one of the strongest in the US, which is a meaningful consideration at any price point.
Pros
1500W output is significantly above the 1000W standard in OTR microwaves
1.8 cu ft interior provides generous cooking space at this price
$299 is well-priced for this wattage and capacity combination
4.4-star rating from 42 buyers indicates strong early satisfaction
Frigidaire brand offers solid warranty and service infrastructure
Cons
20-inch width is non-standard, will not fit a standard 30-inch OTR space
42 reviews is a limited sample for purchase confidence
Controls type not specified in available listing data
Taller and deeper than typical OTR units, confirm clearances carefully
Specifications
Capacity
1.8 cu ft
Wattage
1500 W
Power levels
10
Installation
Over-The-Range
Width
20.0 in
Color
Black
Dimensions
33 X 20 X 19 In
Weight
61.0 lb
Voltage
120 Volts
Performance notes
At 1500W, this unit heats 50% faster than standard 1000W OTR models. The 1.8 cu ft interior handles large casserole dishes and full dinner plates without difficulty. Ten power levels provide adequate control range for defrost and variable heating tasks. The 120V power supply is standard. Dimensions of 33 x 20 x 19 inches reflect a compact-width but tall-and-deep unit, verify ceiling, cabinet, and depth clearances before ordering. This is not a drop-in replacement for a standard 30-inch OTR installation.
What buyers say
A 4.4-star average from 42 reviews is a positive early signal, but the sample size means individual experiences carry significant weight in that average. No recorded purchases last month may reflect the niche 20-inch width limiting the addressable buyer pool rather than dissatisfaction. Frigidaire brand trust generally runs high among buyers familiar with the brand's OTR lineup.
Is the Frigidaire FMOS1846BB a standard 30-inch OTR replacement?
No. This unit is 20 inches wide and will not fit a standard 30-inch over-the-range mounting space. It is designed for compact kitchens or ranges that are narrower than the standard 30-inch configuration. If you have a standard 30-inch range, look at Frigidaire's FFMV1846VS instead.
How much faster does 1500W heat food compared to a 1000W microwave?
A 1500W microwave delivers 50% more power than a 1000W unit. In practice, a task that takes 2 minutes at 1000W takes roughly 80 seconds at 1500W. The time savings are most noticeable for larger volumes of food or dense items like potatoes or frozen meals.
Does Frigidaire offer warranty service for this model?
Frigidaire, as part of Electrolux, has one of the broadest appliance service networks in the US. Standard manufacturer warranty terms apply, typically one year on parts and labor. Confirm current warranty terms with Frigidaire or the retailer at time of purchase.
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