Sunny Health & Fitness SF-E3875 Elliptical Trainer

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Sunny SF-E3875

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300 lbs19.5"Eddy
16 levels

The Sunny SF-E3875 is one of the elliptical trainers released by Sunny Health & Fitness in 2019. It offers a greater weight capacity and a longer stride than the Sunny SF-E3862. It’s a machine with a motorized resistance system but does not have an incline mechanism. In this post, we’ll try to cover each and every aspect with regards to this cross-trainer.

Technical Details and Specifications

  • Assembled dimensions: 62″L x 26″W x 70″H (157L x 66W x 178H cm)
  • Assembled weight: 189.6 lbs (86 kg)
  • Weight limit: 300 lbs (136 kg)
  • Stride: 19.5 inches (49.5 cm)
  • Incline: No
  • Resistance: Eddy current, 16 levels
  • Console: 24 programs
  • Extras: Bottle holder, tablet holder
  • Warranty: Frame 3 years / Parts 180 days

Frame and parts

The Sunny Health & Fitness SF-E3875 features a frame made of steel tubing with heavy-duty construction. With all the parts assembled, it weighs approx. 189.6 lbs (86 kg), thus, it should be carried and assembled by at least two persons. But on the other hand, all this weight is reflected in its overall stability. Plus, its stability is enhanced by its four adjustable and rubberized levelers.

Despite its weight, once the machine is fully assembled, it is fairly easy to move. Its front base has two large rubberized wheels, while its rear tube features a lifting handle. Therefore, by lifting it from its handle and using the front wheels, you won’t have to handle more than 30% of its total weight.

The machine’s metallic base is a one-piece element. Due to this aspect, the machine provides superior sturdiness. It also has a dual rail system for the pedals which lead to better stability and a sure-footed feeling during pedaling.

All the steel bars in the frame construction of this Sunny elliptical trainer are coated with a durable powder finish which is resistant to chipping and corrosion. The top metallic covers of the rails are an exception, though. They’re made of aluminum material and they’re not powder coated. The front covers of the drive and resistance elements are made of ABS material; this also stands for the pedals.

The Sunny SF-E3875 is a fairly large unit. When fully set up, it is approx. 63″ (157 cm) long, and 26″ (66 cm) wide, while its highest point is given by the top of its moving arms which reach approx. 70″ (178 cm) above floor level. These being said, you should assign a usage area for it of at least 110″ x 70″ (280 x 178 cm).

The machine is equipped with two sets of handlebars, one mobile, one fixed. The mobile handlebars feature long, curved grips and also have ball grips at the top. The fixed handlebars are directly welded to the front main mast; they offer a horizontal grip. They also integrate metallic sensor for heart rate detection.

Stride, elliptical path and step-up height

First of all, the Sunny SF-E3875 does not have an incline system. Therefore, the position of the elliptical path and the length of the stride cannot be adjusted.

The machine offers a stride length of approx. 19.5″ (49.5 cm). This being said, it should accommodate users up to 6’2″ – 6’3″ (188 – 190 cm) with no problem, promoting a complete range of motion.

The pedals can support users up to 300 lbs (136 kg). They are made of durable ABS material and attached to heavy-duty steel bars. Their surface is textured for improved adherence and they have inner borders for extra foot stability. They integrate a double wheel system each for superior stability. Their integrated wheels feature industrial-grade ball bearings for a smooth motion over the rails.

The elliptical path of this Sunny cross-trainer is slightly inclined forward. This being said, the pedaling motion feels like descending on a very soft ramp. Therefore, it puts more focus on the glutes, but overall, it delivers a pretty consistent workout for multiple groups of muscles.

At their lowest position, the pedals are at approx. 10″ (25 cm) above floor level. Conversely, their highest position is approx. 16″ (40 cm) above floor level. This being said, it’s recommended to place and use the machine in a room with a ceiling that is at least 20″ (51 cm) higher than your own height.

Drive and resistance

The Sunny Health & Fitness SF-E3875 elliptical machine integrates a pretty heavy flywheel. Its exact weight is not specified, but considering the overall weight of the machine, it should be at least 20 lbs (9 kg). The flywheel has a balanced structure in order to deliver a smooth motion and a consistent pedaling feel. It is also bi-directional, which means that it gives you the possibility to pedal in reverse if you want, in order to focus other muscle groups.

This Sunny elliptical trainer uses a poly-v belt for its transmission. This being said, its drivetrain does not require any periodic lubrication. It also produces considerably less vibration than a chain drive and the usage of the machine is almost completely silent.

The Sunny SF-E3875 features a motorized magnetic resistance system. Its main internal resistance elements are a small servo motor and a magnetic brake integrated into the flywheel assembly. When you adjust the resistance, the motor changes the magnetic pull of the brake, which leads to more or less pedaling difficulty.

The resistance can only be adjusted from the console, and the unit requires being connected to a power source. A power adapter is included with the machine. Also, some of the programs on the console automatically adjust the resistance.

The trainer’s resistance system offers 16 distinct difficulty levels. The first few provide little pedaling difficulty, which makes them great for recovery training. Conversely, the 15-16 levels considerably increase the pedal tension, allowing you to burn more calories, reach a higher pulse rate in a shorter period of time, and overall, benefit from a more consistent workout.


This Sunny elliptical trainer includes the same console as the SF-E3862. It’s a mid-range console which provides a set of built-in programs. However, it does not have Bluetooth or online capabilities.

The console has an LCD display with a 6-inch diagonal with blue LED backlight which considerably improves the readability of the shown data. It tracks the most important workout metrics, including time, distance, total distance, speed, RPM, watts, calories, heart rate, and target heart rate.

The console is not telemetric. This means it can only read your pulse through the sensors integrated into the fixed handgrips. It cannot communicate with any wireless HR transmitters. Also, the speed and distance are only shown in MPH and miles; there is no option to set the console to metric units.

There are 24 workout programs available on the machine’s console, from P1 to P24. The P1 program is the Manual mode. This program allows you to exercise freely adjusting the resistance as you like throughout your session. It also allows you to set up workout goals for time, distance, and calories burned.

The programs from P2 to P13 are preset. Each one has 12 profiles and you can select up to 16 resistance levels for each profile. The P14 program is for Watt Control. It allows you to select a target value for your Watt output.

The P15 program is a Body Fat calculator. It will prompt you to input your height, weight, age, and gender, and based on this data, the console can calculate your Body Mass Index (BMI).

The P16 – P20 are HR-based programs. Evidently, they require you to use the pulse sensors. P16 is a Target Heart Rate program. It allows you to select a parameter for your heart rate and the console will notify you if your pulse falls below your target. The P17-P20 programs are Heart Rate Control programs with preset HRC targets at 55%, 65%, 75%, and 85%. During any of these programs, the console will auto-adjust the resistance adding intensity in case your pulse falls below the selected heart rate or reducing the intensity in case you exceed the selected heart rate.

Finally, the P21-P24 are Custom User programs. You can create separate workout profiles and input different user data (age, weight, height, etc) for each one of them. Each custom program can be saved and re-used for as many times as you like.

Assembly and Maintenance

The drive and resistance elements of this elliptical trainer come pre-assembled, forming the main body of the unit. Also, as we’ve mentioned above, the base of the unit is a one-piece element. Therefore, the main step of the assembly is to connect these two elements, they add the moving arms, the pedals, and the console. This may take up to one hour. However, it’s far from being a complicated task. Each assembly step is clearly described in the manual, and a basic toolkit is also included.

Internal maintenance is not required for this machine. Its joints may need lubrication from time to time, though. Also, keeping the rails of the pedal bars clean and periodically inspect the machine for loose parts is recommended.

The Pros

  • Sturdy steel construction – can support users up to 300 lbs;
  • Adjustable stabilizers;
  • Transport wheels on the front base;
  • Lifting handle on the rear base;
  • Large, non-slip pedals;
  • Quiet operation, ideal for apartment use;
  • 16 levels of eddy current resistance;
  • 24 workout programs;
  • Goal settings for time, distance, calories, pulse, and watts;
  • Recovery function;
  • BMI function; 
  • The console display has LED backlight which considerably improves readability;
  • Pulse sensors integrated into the fixed handlebars;
  • Tablet holder included;
  • Bottle holder included;
  • Fairly easy to assemble;
  • Little maintenance required;
  • Excellent warranty.

The Cons

  • The console is not telemetric;
  • No incline;
  • No sound system;
  • No online connectivity.


The Sunny SF-E3875 is a mid-range elliptical trainer designed for home use. It features an eddy current resistance system with 16 levels, and a console with 24 workout programs. It has a fairly sturdy construction, being rated for a user weight limit of 300 lbs. It’s a great machine for light to intense cardio workouts, muscle toning, stamina development, and weight loss.

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