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Mueller Ultra Kettle M99S vs Cosori Glass Electric Kettle GK172-CO Side-by-Side Comparison

Our review shows which simple glass electric kettle is better. The Mueller Ultra Kettle M99S or the Cosori Glass Electric Kettle GK172-CO?

By , , and ·Published

Mueller Ultra Kettle M99S

Cosori Glass Electric Kettle GK172-CO

Mueller Ultra Kettle M99S vs Cosori Glass Electric Kettle GK172-CO

Overall Verdict

Ranking by
OverallScore Performance40% Design25% Usability35% ScoreOverall 40%Performance 25%Design 35%Usability Mueller Ultra Kettl...Cosori Glass Electr...7.88.17.97.57.47.37.67.3
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The Mueller Ultra Kettle (M99S) and the Cosori Glass Electric Kettle GK172-CO were nearly tied in our data analysis. The key distinctions between them emerged from our performance assessments.

At the same power draw, the two kettles have similar boiling speed and noise level while boiling. However, the Cosori consumed a lot more energy. Also, the Mueller retained heat better after boiling despite both being glass.

Both kettles offer premium design features, including a removable limescale filter, water-level markings, an LED ring, a lid button, and a power switch. One notable feature of the Cosori kettle is its stainless steel inner lid, so there’s no plastic to water contact.

However, unlike the Mueller, the Cosori's limescale filter is not removable for frequent maintenance. On the other hand, we noticed that the handle of the Mueller kettle is somewhat awkwardly shaped.

Pros & Cons

  • Fast boiling time
  • Low energy consumption
  • Quite when boiling
  • Good heat retention
  • Inexpensive
  • Easy to use
  • Glass spout
  • Stainless steel under lid
  • Large opening
  • Quiet when boiling
  • Easy to use
  • Light weight
  • Handle not ideally shaped
  • Cord wrap loosely
  • High energy consumption
  • Cord doesn’t fit storage

Key Specs

Dimensions
L8.27 x W6.34 x H8.78 inches
L9.13 x W6.22 x H10.25
Weight
2.4 lbs (1.1 kg)
2.4 lbs (1.1 kg)
Material
Glass and BPA-free plastic
Glass and BPA-free plastic
Capacity
57.5 fl oz (1.7 L)
57.5 fl oz (1.7 L)
Power
1500 W
1500 W
Cord Placement
Base (cordless carafe)
Base (cordless carafe)

Where to Buy

Price at publication
$27.44
$28.65

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Analysis and Test Results

Performance

Overall Performance Scoring
8.1
7.3

Boiling Time

7.8
8.0
1.5 liter of water boiling inside the Mueller Ultra Kettle (M99S). The digital timer displays 07 minutes and 14 seconds.
1.5 liter of water boiling inside the Cosori Glass Electric Kettle (GK172-CO). The digital timer displays 7 minutes and 1 seconds.
Room Temperature
80°F
80°F
Water Volume
1.5 liters
1.5 liters
Boiling Time
7m 14s
7m 1s

Energy Consumption

8.4
5.8
The power meter reads the energy consumption of the Mueller Ultra Electric Kettle (M99S) to be 148 Wh.
The Mueller M99S uses 148 Wh to bring 1.5 liters of water to a boil.
The power meter reads the energy consumption of the Cosori Glass Electric Kettle (GK172-CO) to be 161 Wh.
Voltage
113 V
114 V
Current
10.97 A
12.12 A
Power
1230 W
1370 W
Energy Consumption
148 Wh
161 Wh

Noise Level

9.0
9.0
The Mueller Ultra Electric Kettle (M99S) is boiling 1.5 liters of water. The noise meter displays the maximum sound pressure level to be 70.3 dB. The power meter reads 113 V, 10.97 A, 1.23 kW, 73 Wh, 50 Hz, and 1.0 PF.
The Cosori Glass Electric Kettle (GK172-CO) is boiling 1.5 liters of water. The noise meter displays the maximum sound pressure level to be 70.4 dB. The power meter reads 114 V, 12.12 A, 1.37 kW, 0.63 Wh, 50 Hz, and 1.0 PF.
Noise Level
70.3 dB
70.4 dB

Keep Warm

7.5
6.5
On the right is a Thermo Pro two-probe digital thermometer displaying 203°F for both probes. In the middle is the Mueller Ultra Electric Kettle (M99S) with 1.5 liters of water and two probes inside. On the right is a digital timer displaying 5 minutes on the countdown.
On the right is a Thermo Pro two-probe digital thermometer displaying 200°F for both probes. In the middle is the Cosori Glass Electric Kettle (GK172-CO) Keep Warm with 1.5 liters of water and two probes inside. On the right is a digital timer displaying 5 minutes on the countdown.
After 5 Minutes
203°F / 95.5°C
201°F / 94.5°C

Design

Overall Design Scoring
7.9
7.6

In the Box

On the upper right is the Mueller Ultra Electric Kettle (M99S). On the left is a cardboard box. Below the kettle, on the right is an instruction manual and on the left is the power base.
On the upper left is the box of the Cosori Glass Electric Kettle (GK172-CO). In the middle is the carafe. On the right are two documents. Below the carafe is the power base.

Dimensions

The Mueller Ultra Electric Kettle (M99S) is 8.27 inches in length, 6.34 inches in width, and 8.78 inches in height.
The Cosori Glass Electric Kettle (GK172-CO) is 9.13 inches in length, 6.22 inches in width, and 10.25 inches in height.
Length
8.3" (21.0 cm)
9.1" (23.2 cm)
Width
6.3" (16.1 cm)
6.2" (15.8 cm)
Height
8.8" (22.3 cm)
10.3" (26.0 cm)
Weight
2.4 lbs (1.1 kg)
2.4 lbs (1.1 kg)

Carafe

8.0
7.0
The heating plate with a LED ring around it of the Mueller Ultra Electric Kettle (M99S).
The heating plate with a LED ring around it of the Mueller Ultra Electric Kettle (M99S).
The heating plate with a LED ring around it glowing blue of the Mueller Ultra Electric Kettle (M99S).
The mesh filter attached to the plastic black V-shaped spout of the Mueller Ultra Electric Kettle (M99S).
The plastic black bottom of the Mueller Ultra Electric Kettle (M99S).
The carafe of the Cosori Glass Electric Kettle (GK172-CO) sitting on top of its power base.
The carafe of the Cosori Glass Electric Kettle (GK172-CO) sitting on top of its power base.
The heating plate with a LED ring around it of the Cosori Glass Electric Kettle (GK172-CO).
The heating plate with a LED ring around it glowing blue of the Cosori Glass Electric Kettle (GK172-CO).
The glass V-shaped spout of the Cosori Glass Electric Kettle (GK172-CO).
Capacity
57.5 fl oz (1.7 L)
57.5 fl oz (1.7 L)
Weight
1.9 oz (53 g)
2.1 oz (59 g)
Materials
Borosilicate glass
Borosilicate glass
Spout
V-shaped
V-shaped
Opening Diameter
3.1" (8.0 cm)
4.3" (11.0 cm)
LED Ring
Blue
Blue
Filter
Fixed mesh
Removable mesh
Water Level Markings
Yes
Yes
Tea Infuser
No
No

Handle

7.0
7.0
A person holding the Mueller Ultra Electric Kettle (M99S) by its handle.
A hand holding the Cosori Glass Electric Kettle (GK172-CO)  by its handle.
Materials
Cool-touch BPA-free plastic
Cool-touch BPA-free plastic
Type
Cool-touch, anti-slip
Cool-touch, anti-slip

Lid

7.0
8.0
The black pop-up lid of the Mueller Ultra Electric Kettle (M99S) has a silver button in the middle.
The black pop-up lid of the Mueller Ultra Electric Kettle (M99S) has a silver button in the middle.
The pop-up lid of the Mueller Ultra Electric Kettle (M99S) opens at a 75° angle.
The pop-up lid of the Cosori Glass Electric Kettle (GK172-CO) opens at an 80° angle and has a mesh filter attached to it.
The pop-up lid of the Cosori Glass Electric Kettle (GK172-CO) opens at an 80° angle and has a mesh filter attached to it.
The lid’s pop-up button of the Cosori Original Electric Glass Kettle (GK172-CO) is located on its handle.
Materials
BPA-free plastic
304 stainless steel
Type
Hinged
Hinged
Open Mechanism
Push-button pop-up
Push-button

Base

9.0
9.0
The top of the power base of the Mueller Ultra Electric Kettle (M99S).
The top of the power base of the Mueller Ultra Electric Kettle (M99S).
The bottom of the power base of the Mueller Ultra Electric Kettle (M99S) has a cord storage and also three small anti-slip rubber pads.
The top of the power base of the Cosori Glass Electric Kettle (GK172-CO).
The top of the power base of the Cosori Glass Electric Kettle (GK172-CO).
The bottom of the power base of the Cosori Original Electric Glass Kettle (GK172-CO) has a cord storage and also three small anti-slip silicone pads.
Materials
BPA-free plastic
BPA-free plastic
Type
360°
 Swivel 360°
Cord Storage
Yes
Yes

Power Cord

The power cord of the Mueller Ultra Electric Kettle (M99S) is 30.31 inches long.
The two-pronged plug of the Cosori Glass Electric Kettle (GK172-CO).
The two-pronged plug of the Cosori Glass Electric Kettle (GK172-CO).
The power cord of the Cosori Glass Electric Kettle (GK172-CO) is 29.53 inches in length.
Type
three-pronged plug
two-pronged plug
Power
1500 W
1500 W
Rated Output
120 V ~ 60 Hz
120 V ~ 60 Hz
Cord Placement
Base
Base
Cord Length
30.3" (77.0 cm)
29.5" (75.0 cm)

Usability

Overall Usability Scoring
7.5
7.3

User Control

7.0
7.0
The power switch located on the handle of the Mueller Ultra Electric Kettle (M99S).
The clear plastic power switch of the Cosori Glass Electric Kettle (GK172-CO).
Control
One touch
One touch
Indicator Light
No
Blue LED
Display
No
No
Temperature Control
No
No
Presets
No
5
Keep Warm
No
30 minutes
Automatic Shut-Off
Yes
Yes
Boil-Dry Protection
Yes
Yes

Ease of Use

8.0
8.0
A person in a grey shirt pouring water from the Mueller Ultra Electric Kettle (M99S) into a glass.
A person in a grey shirt pouring water from the Cosori Glass Electric Kettle (GK172-CO) into a glass.

Cleaning

7.0
6.0
A person in a black shirt holding the Mueller Ultra Electric Kettle (M99S) by its handle on one hand and the other hand wiping the carafe interior with a piece of tissue.
A person in a black shirt holding the Mueller Ultra Electric Kettle (M99S) by its handle on one hand and the other hand wiping the carafe interior with a piece of tissue.
The removable mesh filter of the Mueller Ultra Electric Kettle (M99S).
A person in a black shirt holding the Cosori Glass Electric Kettle (GK172-CO) by its handle on one hand and the other hand wiping the carafe interior with a piece of tissue.

Behind the Comparison

Headshot of Alan Nguyen
Alan NguyenReviewer

Alan Nguyen is a writer and product reviewer at HealthyKitchen101. His major in English language teaching taught him to present concise information. In addition to his cooking hobby, he values the practical aspects of household appliances.

Headshot of Lap Vo
Lap VoTest Lead

Lap is Head of the Research, Testing, and Review Team (RTR Team) at HealthyKitchen101.com, where he directs and supervises the testing of kitchen gadgets and appliances.

Headshot of Nguyen Ntk
Nguyen NtkVisual Specialist

Nguyen Ntk is a graphic designer, photographer, and videographer whose philosophy centers around respecting and celebrating the beauty of reality. Through his lenses, Nguyen strives to capture the true essence of objects and events, showcasing and highlighting authentic features without distortion or exaggeration.

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