Ranklim
#2 COSMO COS-305AGC 30-Inch Slide-In Range
COSMO

COSMO COS-305AGC 30-Inch Slide-In Range

Ranked #2 in Best Gas Ranges of 2026: 7 Top Picks Ranked

Amazon rating
3.6
Ratings
23
Our score
9.4/10
Rank
#2 of 7
Price at Amazon $1,008.99

Price as of Sep 23, 2026. Prices change often and may be outdated. Check Amazon for the current price.

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What we like

  • 5.0 cu ft convection oven with five sealed burners
  • 18,000 BTU power burner for fast boiling
  • Slide-in design sits flush with counters
  • Cast iron grates and digital display with timer
  • Stainless steel body wipes clean

Watch out for

  • Only 23 Amazon ratings at 3.6 stars
  • LP conversion kit sold separately
  • Needs a slide-in cutout, not freestanding

Our review

Cosmo Cos-305agc 30-inch Slide-In Range Review: Worth It in 2026?

Sep 26, 2026

In this cosmo cos-305agc 30-inch slide-in range review, the COSMO COS-305AGC earns the number two spot out of seven gas ranges and the Best for large families label. It is a 30-inch slide-in gas range with five sealed burners and a 5.0 cu ft convection oven, priced at $1,008.99. The 197.5-pound body is built from stainless steel with cast iron grates, and the model carries a 3.6-star average across 23 Amazon ratings. That rating pool is small, so treat the score as a signal rather than proof. Still, for a household that fills five burners at once, the hardware on paper lines up well with the price.

The burner layout is the real story here. COSMO fits this range with one 18,000 BTU burner for searing and boiling, one 12,000 BTU burner, and two 6,000 BTU burners for simmering sauces, which means you can run a stockpot and two side dishes at the same time. Sealed burners keep spills on the cooktop instead of letting them drop into the burner box, and the cast iron grates hold heat between batches. In the oven, a fan-assisted convection element circulates hot air, so food bakes more evenly, in less time, and at a lower temperature than in a standard oven. Four oven functions, two racks, and a digital display with a timer cover long roasts. The 5.0 cu ft cavity holds a large turkey or several sheet pans at once.

That said, the value math depends on your kitchen. At $1,008.99, the COSMO COS-305AGC undercuts what many five-burner convection ranges cost, and it carries ETL listing plus a 1-year limited warranty with customer support based in the USA. By contrast, the GE range that holds the top spot in this guide has a much deeper pool of buyer ratings, which matters when a 3.6-star average rests on just 23 reviews. Meanwhile, two fit notes can rule it out: it uses a slide-in cutout rather than a freestanding slot, and the liquid propane conversion kit is sold separately. Even so, if you feed a crowd and want five burners plus a convection gas oven, this is the one to get.

Specifications

UPC
850036237037
ASIN
B09Y135FV8
Capacity
5 cubic feet
Fuel Type
Gas
Brand Name
COSMO
Efficiency
High Efficiency
Model Name
COS-305AGC
Unit Count
1 Count
Drawer Type
Storage
Form Factor
Single Oven
Item Weight
197.5 pounds
Finish Types
Stainless Steel
Manufacturer
Cosmo
Model Number
COS-305AGC
Controls Type
Knob
Material Type
Stainless Steel
Mounting Type
Slide-in
Item Highlight
Cosmo COS-305AGC Oven Fan Circulation, Cast Iron Grates, Digital Display with Timer, Liquid Propane Convertible, Wok Ring
Item Type Name
30 in. Nebula Coll 5 cu ft 5 Burner Gas Range, Convection, Stainless Steel
Heating Element
Sealed
Number Of Racks
2
Number of Items
1
Best Sellers Rank
#1,722 in Appliances (See Top 100 in Appliances) #19 in Freestanding Ranges
Installation Type
Slide-In
Specification Met
ETL
Included Components
Range
Warranty Description
1 Year Limited Warranty
Manufacturer Part Number
COS-305AGC
Item Dimensions D x W x H
25"D x 29.8"W x 36.4"H
Number of Heating Elements
5

Frequently asked questions

Is the COSMO COS-305AGC a slide-in or a freestanding gas range?
The COSMO COS-305AGC is a 30-inch slide-in gas range, and the listed mounting and installation types are both slide-in. That means it drops into a cutout between your cabinets instead of the open slot a freestanding range uses, so measure your opening before you order.
What are the dimensions and weight of the COSMO COS-305AGC?
The COSMO COS-305AGC measures 29.8 inches wide, 25 inches deep and 36.4 inches high, and it weighs 197.5 pounds. The listing also gives an adjustable height range of 36.1 to 37.3 inches, which helps it line up with your countertop.
How many burners does the COSMO COS-305AGC have, and how many BTUs do they put out?
The COSMO COS-305AGC has five sealed gas burners, including an 18,000 BTU burner, a 12,000 BTU burner and two 6,000 BTU burners. That spread lets you sear or boil on the high-output ring while delicate sauces hold at a low simmer on the smaller burners.
How big is the oven on the COSMO COS-305AGC, and does it have convection?
The oven holds 5.0 cubic feet and uses a fan-assisted circular heating element for convection cooking. COSMO states that this fan design heats food more evenly, in less time and at a lower temperature than a standard oven, and the range includes two racks and four oven functions.
Does the COSMO COS-305AGC come with a liquid propane conversion kit?
No, the liquid propane conversion kit for the COSMO COS-305AGC is sold separately, so add that part to your budget if your home runs on LP. The range is listed as liquid propane convertible, but the kit itself is not included.
Is the COSMO COS-305AGC worth it for a large family, and what warranty applies?
The COSMO COS-305AGC is worth a look if you need five burners and a 5.0 cu ft convection oven for about $1,009, and it comes with a 1-year limited warranty plus customer support based in the USA. Keep in mind that its 3.6-star average comes from only 23 Amazon ratings, so the long-term record is thinner than the top-ranked GE model's. Buy it if the slide-in fit works in your kitchen and you want the extra burner now.
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COSMO COS-305AGC 30-Inch Slide-In Range

From $1,008.99 at Amazon

Price as of Sep 23, 2026. It may have changed since.

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