Sunny SF-E3912 Elliptical Trainer | Electro-Magnetic Resistance

Receive a cardio workout in the comfort of your own home with the Sunny SF-E3912 Elliptical Trainer. Stride 15.5 inches when you step onto the oversized and textured foot pedals. Additionally, the maximum 330 lb weight capacity and its floor stabilizers keep the elliptical steady during workouts.

The SF-E3912 has a fitness console featuring an LCD with an LED backlight that tracks your speed, time, distance, calories burned, rotations per minute, watt generations, pulse, and magnetic resistance level. In addition, take advantage of 24 unique workout modes, including manual, pre-program, watt, body fat, heart rate, and user programs.

The Sunny SF-E3912 Elliptical Trainer comes with textured non-slip foot pedals that will accommodate all sizes, while the grip will ensure safe footing during the most demanding and vigorous workouts! Additionally, utilizing the complete motion handlebars will engage muscles in the pecs, biceps, and traps while activating muscles in the glutes, thighs, and hamstrings.

Learn more in my complete review below!

Sunny SF-E3912 Elliptical Trainer
Sunny SF-E3912 Elliptical Trainer

Product: Sunny SF-E3912 Elliptical Trainer

Price: For a great deal on this gym, merely go here to Sunny Health &

Warranty: Frame 3 years / Parts 180 days

My rating: is 8/10

Affiliate Disclosure: As a Sunny Health & Fitness Affiliate Program participant, I earn commissions on purchases made through links in the post. Full disclosure

Details and Specifications

  • Assembled dimensions: 59L x 23.5W x 64H inches (150L x 60W x 163H cm)
  • Assembled weight: 104.8 lbs (47.5 kg)
  • Supported weight: 330 lbs (150 kg)
  • Stride: 15.5 inches (39.4 cm)
  • Incline: No
  • Resistance: Motorized-magnetic, 16 levels
  • Console: 24 programs, Recovery function
  • Extras: Tablet holder, bottle holder
  • Warranty: Frame 3 years, Parts 180 days

SF-E3912 Frame Construction

Sunny SF-E3912 Elliptical Trainer

The Sunny SF-E3912 elliptical trainer features a steel frame construction with the base frame completely covered by ABS guards. In addition, all the steel parts come coated with a corrosion-resistant and chip-resistant gray paint finish.

The machine does not fold, but it has a smaller footprint compared to other elliptical trainers. With the frame fully assembled, it is only 59″ (150 cm) long and 23.5″ (60 cm) wide. Therefore, it is advisable to leave at least two feet of clearance on each side of it and at least one foot of clearance at the front and rear for unhindered usage.

The fully assembled unit is relatively heavy. It weighs approx. 105 lbs (~47.5 kg). Thus, it provides excellent stability. Its rear base has adjustable, rubberized stabilizers, while the front base rests on rubber pads. The front base comes with transport wheels, so the assembled unit can quickly move to a storage location.

Handlebars and Pedals

The Sunny SF-E3912 has two handlebars, one mobile and one fixed. The mobile handlebars feature extended grips with ball grips at the top. They are directly attached to the pedal bars, so they cannot be locked to remain stationary. Instead, they continue to move for as long as the pedals are moving.

The fixed handlebars integrate a set of pulse sensors. Thus, the console unit can monitor your pulse rate by holding onto them. Both handlebars have rubberized grips for optimal comfort and hand adherence.

Since it’s a rear-drive elliptical trainer, the pedals of the Sunny SF-E3912 elliptical trainer attach to a set of heavy-duty steel bars. As a result, they have a maximum user weight capacity of up to 330 lbs (150 kg), which is impressive for a home-use machine.

Sunny SF-E3912 Elliptical Trainer
Sunny SF-E3912 Elliptical Trainer

The pedal trays are made of durable ABS material. They comfortably accommodate athletic shoes of all sizes. They have front and inner borders and a textured surface to provide extra foot stability. However, the pedals do not have extra cushioning or articulation, nor are they adjustable.

SF-E3912 Elliptical path, stride, and step-up height

The elliptical path is slightly inclined forward, as with most elliptical machines with a rear-drive. The same goes for this Sunny elliptical trainer. Therefore, the pedaling motion resembles a descent on a very soft ramp. This is a plus, as a ride on this machine focuses more on your glutes.

The Sunny SF-E3912 elliptical trainer does not have an incline system. Also, its stride is non-adjustable. Its stride is also not highly long. It measures approx. 15.5″ (39.4 cm), so the machine may not provide a satisfying range of motion for users over 6’3″ – 6’4″ (190 – 193 cm).

Nonetheless, as long as they don’t exceed the 330 lbs (150 kg) weight capacity, any user can exercise on this machine and benefit from a consistent and low-impact cardio workout.

The step-up pedal height is approx—10″ (25 cm). Conversely, at their highest point, the pedals are approx. 16″ (41 cm) above floor level. Therefore, it is advisable to use the machine in a room with a ceiling at least 22″ (56 cm) higher than the tallest user’s height.

Drive and resistance

The Sunny SF-E3912 elliptical trainer features a motorized-magnetic resistance system. This means it requires an external power source to make available the resistance adjustment. A US standard power adapter (9V/1.0A) comes with the machine.

The resistance adjustment is automatic. Therefore, depending on the user program, the machine can auto-adjust the resistance.

Sunny SF-E3912 Elliptical Trainer

The unit’s resistance system consists of an internal magnetic brake and a servo motor. As you select a specific resistance level from the console, the motor will change the brake position, increasing or decreasing the intensity of the internal magnetic field, which results in more or less pedaling difficulty.

The machine offers 16 levels of resistance. The first level is reasonably light, offering the possibility to train on a fundamental level. This is great for users who require recovery training, users with specific disabilities, or elderly users.

Conversely, the 15-16 tension levels deliver considerably more resistance, which is excellent for anyone who wants a more consistent training regimen.

The internal flywheel isn’t weighty. It weighs 13.2 lbs (6 kg). However, it has a perimeter-weighted structure which improves inertia and overall stability. Therefore, the pedaling motion is smooth, delivering a sure-foot sensation with almost nonexistent impact on the joints.

Most fitness machines with a magnetic resistance system feature a belt drivetrain. The Sunny SF-E3912 is no exception. It integrates a heavy-duty belt, which provides excellent traction. Since it’s a belt-drive, it does not require lubrication or periodic maintenance. It also provides a tranquil and vibration-free pedaling motion.

SF-E3912 Console

The Sunny SF-E3912 elliptical trainer features a mid-range console. To begin with, it has a large LCD with an LED backlight for superior readability. The display divides into multiple subsections to show as many workout metrics as possible. For example, it indicates time, RPM, speed, distance, total distance, calories, watts, and pulse.

The speed and distance values display only in imperial units (MPH and miles); you cannot set them to metric units. Also, the console can only read your pulse through the grip sensors integrated into the fixed handlebars. It is not telemetric and cannot track your pulse through a wireless transmitter.

Sunny SF-E3912 Elliptical Trainer
Sunny SF-E3912 Elliptical Trainer

The console also integrates a tablet holder above the console display. Thus, by placing your phone or tablet on it, you won’t block the view of your workout metrics. Plus, the top section of the console has a sticker with the heart rate zones that you should aim for depending on your age to benefit from the better aerobic output, fat burn, etc.

Workout Programs

The console has no online connectivity functions and cannot communicate with online fitness apps. However, it has its own 24 workout programs. The first program (P1) is the manual program. This allows you to adjust the resistance as you like from the Up/Down controls of the unit during your workout.

The P2-P13 programs are preset. Each one provides a specific workout. For example, you have a Peak program, a Hills program, and an Interval program. For each program, the resistance is adjustable between level 1 and level 16.

The P14 is the Watt Control program. You can select a watt value for this program, and the console will auto-adjust the resistance, allowing you to maintain a constant watt output.

Finally, the P15 program is the Body Fat calculator. This program will prompt you to input your data, such as weight, height, gender, and age, to calculate your Body Mass Index.

The following five programs are Heart Rate based. P16 is the Target HR program. It allows you to select a target Heart Rate, and the pulse indicator will flash on the display if you exceed the target HR. P17-P20 have preset 55%, 65%, 75%, and 85% HR targets. The console auto-adjusts the resistance during these programs to keep your HR in the target zone.

The P21-P24 programs are user-specific. Users can set their program, selecting a time, distance load, and more. Therefore, the console can save up to four custom programs.

It’s important to note that the console has a Recovery function. This is used at the end of your workout to determine your current fitness level. It measures how long it takes your pulse to return to an average BPM after the training. The result gives you a fitness rating between F1 (excellent) and F6 (poor).

SF-E3912 Assembly and Maintenance

Sunny SF-E3912 Elliptical Trainer
Sunny SF-E3912 Elliptical Trainer

The main body of the elliptical comes pre-assembled, with all the ABS covers attached. Therefore, you only need to connect the base bars, the front mast, the pedal bars, trays, the fixed and moving arms, and the console.

This may take more than an hour, but the task is not too complicated. The included manual provides all the necessary instructions, and an essential toolkit comes with the machine.

The internal components don’t need any maintenance, at least not for an extended time. Therefore, in terms of care, you only need to wipe off the sweat that may drop on the frame at the end of the workout and periodically check for loose bolts or parts and retighten as needed. The unit’s joints may also require lubrication from time to time to prevent squeaking sounds.


  • Sturdy construction – can support users up to 330 lbs;
  • Adjustable stabilizers on the rear base;
  • Transport wheels on the front base;
  • Fixed and mobile handlebars;
  • Balanced flywheel providing a smooth and steady pedaling motion with a consistent momentum;
  • Extra-large, non-slip, durable pedals;
  • 16 levels of eddy current resistance;
  • Multi-window LCD console to show all the workout metrics simultaneously;
  • LED backlight on the console display;
  • The console can track time, distance, total distance, speed, RPM, watts, pulse, and calories burned;
  • Goal functions for time, distance, calories, and pulse;

    Sunny SF-E3912 Elliptical Trainer
  • 24 workout programs;
  • Recovery function included;
  • Tablet holder included;
  • Heart rate intervals sticker on the console;
  • Quiet operation;
  • Easy to assemble;
  • Little maintenance is required;
  • Decent warranty.


  • The calories reading function isn’t too accurate;
  • The fitness monitor does not have online connectivity.

Sunny SF-E3912 Elliptical Trainer Summary

The Sunny Health & Fitness SF-E3912 is an elliptical trainer for home use. It features an automatic magnetic resistance system with 16 tension levels and a console with 24 workout programs. It also has a reasonably decent weight capacity to support maximum user weight up to 330 lbs (150 kg).

Moreover, it’s an excellent machine for a low-impact cardio workout, interval training, recovery training, stamina development, and weight loss.

I hope you found this article helpful and informative. Please speak up if you have anything you’d like to share on the topic or opinions about my website.? I look forward to your comments, questions, and the sharing of ideas.

Please remember that you should consult your physician to determine if you have any medical or physical conditions that could risk your health and safety or prevent you from using the equipment properly. In addition, your physician’s advice is essential if you are taking medication that affects your heart rate, blood pressure, or cholesterol level.

6 thoughts on “Sunny SF-E3912 Elliptical Trainer | Electro-Magnetic Resistance”

  1. Hey Robert, I must commend your effort in putting up this post. I must say that your description is pretty detailed and helpful. I’ve wanted to get something for the home that gives an excellent cardio workout. I’m sure that the SF-E3912 would fit the need.

    I wanted to ask whether you could mention any health condition that could prevent a person from using the equipment.

    • Hi there; thanks for stopping by and sharing your thoughts with us. I advise you to speak with your doctor to find out if you have any health conditions to prevent you from exercising.

      Please let me know if I may further assist you with exercise equipment. I’m always happy to help.

      Kind regards, Robert

  2. This is an excellent review of all the features of the SF-E3912 Elliptical. I agree with your 8/10 rating; it’s a simple, durable elliptical I can see using in my home gym. I like the fact it has low maintenance. The console isn’t too large to block your view and can hold a tablet if you decide to read and work out. I like using the ellipticals at the gym instead of treadmills; it adds a bit more to the workout than just cardio. 

    • Hi Matt, thanks for stopping by and sharing your thoughts with us. Please let me know if I may further assist you with exercise equipment. I’m always happy to help.

      Kind regards, Robert

  3. I want to purchase this Sunny SF-E3912 Elliptical. I have had issues with my carotid artery and was told that because of this, I can not take antidepressants. Instead, the doctor said I needed exercise to help with my depression. I think this may be the perfect solution for me. I enjoyed reading this article, which convinced me I needed one.  

    • Hi Miguel, thanks for stopping by and sharing your thoughts with us. Sorry to hear about your health condition. Follow your doctor’s advice, and I’m sure exercise will help you to feel better.

      Please let me know if I may further assist you with exercise equipment. I’m always happy to help.

      Kind regards, Robert


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