Sunny Health & Fitness SF-T7873 Treadmill

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Sunny SF-T7873

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285 lbs2.5 HP
11 MPH
9 programs,
Frame: 3 years
Parts: 180 days

The Sunny SF-T7873 treadmill is one of the models released by Sunny Health & Fitness in 2019. It’s a machine made for home-use, similar in terms of features to the 3G Cardio Lite Runner. Its running surface is a bit smaller, though, and offers only 9 workout programs.

Key Features and Specifications

  • Assembled dimensions: 62L x 38W x 52H inches (157L x 96W x 132H cm)
  • Running surface: 52.5L x 16W inches (133L x 40.6W cm)
  • Assembled weight: 125.7 lbs (57 kg)
  • Supported weight: 285 lbs (129 kg)
  • Motor: 2.5 HP, 0.6 – 11 MPH
  • Incline: Automatic, 0-15°
  • Console: 9 pre-set programs, 1 HRC program, Body Fat Test
  • Extras: Sound system, bottle holders
  • Warranty: Frame 3 years / Parts 180 days

Frame construction

Like most other treadmills, the Sunny Health & Fitness SF-T7873 features a steel frame. Its base is made of rectangular tubing while the upright bars that sustain the console are oval. They’re all coated with a rust-resistant and chip-resistant paint finish. The color used is light gray, this being the only color available for this machine. The treadmill also has several ABS covers, though. The base joint covers, the motors covers, the side rail covers, and the console dashboard are all made of ABS material.

Compared to other treadmills, the Sunny SF-T7873 is not too large. Its footprint is approx. 62″L x 38″W (157 x 96 cm). However, it is recommended to leave at least three feet of clearance at the rear of the deck, and at least two feet of clearance on each side, for ease of access and safe usage.

The treadmill has a folding design, though. So, once you’ve finished your workout, you can fold it up to save some space. With the deck folded up, its footprint becomes 26.5″L x 38″W (67 x 96 cm) while its height reaches approx. 57″ (145 cm). Also, the folding mechanism uses a hydraulic leg. Therefore, when you unfold it, the deck is slowly lowered to prevent damage.

The front base of the frame features a set of adjustable stabilizers. However, the mid base ends and the rear stabilizers are equipped with wheels. The mid wheels can be used for relocating the machine when it is in the folded position.

Deck construction and incline

The Sunny Health & Fitness SF-T7873 treadmill offers a running surface of 52.5″L x 16″W (133L x 40.6W cm). It’s not too large, but should accommodate comfortably users up to 6’0″ (183 cm). Taller users should also be able to use the machine, but they may not be able to perform a complete motion range. Also, the deck itself is rated for a weight capacity of 285 lbs (129 kg) which is not bad for a home-use treadmill.

The machine uses a multi-ply belt. The top layer of the belt is rubberized to provide a superior grip. Also, even though there aren’t any cushioning elements visible on the sides of the deck as it is the case with other treadmills, the Sunny SF-T7873 does have several rubber pads under the side rail covers which reduce a bit of the impact generated by each foot strike.

This Sunny treadmill is equipped with an automatic incline system. This means that you can adjust the incline while you are walking or running on it. It also means that the console can adjust the incline automatically.

The machine’s incline system consists of a small lift and a motor (different from the drive motor). As you adjust the incline (or as the console adjust the incline), the motor triggers the lift to elevate or lower the front section of the deck. The incline of the deck can be adjusted either from the controls integrated into the left handgrip of the machine, or from the +/- controls on the console. There also are controls for the quick selection of the 2%, 5%, 9%, and 12% incline levels.

The machine makes available an incline range up to 15%. However, it is important to mention that with the incline set to 0%, the deck is not 100% horizontal. It still has a bit of incline. Also, the deck step-up height of approx. 9″ (23 cm). However, with the incline set at maximum, the front part becomes elevated by several inches. Therefore, it’s best to place and use the machine in a room with a ceiling that exceeds your own height by at least 16″ (41 cm).

Drive motor

The Sunny Health & Fitness SF-T7873 is and electric treadmill. It is equipped with a 2.5 HP drive motor. Although it doesn’t offer the power of a commercial-grade treadmill motor, it still provides a pretty decent performance. The manual specifies, though, that the machine should be powered off for at least 10 minutes after every 2 hours of use.

The default starting speed of the treadmill is 0.6 MPH, and the motor offers speed levels up to 11 MPH. The speed adjustment increments are 0.1 MPH, so you can easily adapt your pace when you change the speed.

Just as for the incline, the machine has speed adjustment controls integrated into the right grip. There also are gradual adjustment speed controls on the console, as well as quick adjustment speed controls for 1 MPH, 3 MPH, 5 MPH, and 9 MPH.

Since it’s not a super powerful motor, the machine’s power usage is also fairly small. In other words, even if you will be using it daily, it shouldn’t add more than a few dollars to the electricity bill. Also, the motor itself doesn’t generate a lot of noise when in use, but depending on how fast you go, your cadence may generate more or less noise.


The Sunny SF-T7873 treadmill features a console with a pretty simple interface. First of all, it has an LCD display with LED backlight that indicates time, distance, speed, incline, calories, and pulse. Speed and distance can be set either to English units (MPH, miles) or metric units (km/h, kilometers). For pulse monitoring, you can either hold on to the sensors integrated into the side grips of the treadmill or use a wireless 5.3 kHz HR chest strap transmitter (this accessory is not included).

The treadmill offers several workout programs. First of all, it has the standard Manual mode which gives you the possibility to walk or run freely, making speed and incline adjustments manually as you go. In Manual mode, you can also select countdown targets for time, distance, and calories burned.

Next, the console offers 9 (P1 – P9) pre-set workout programs. These can be accessed via the “Prog” button on the console. Each program has the segment profile shown on the console dashboard. Each program adjusts both the speed of the belt and the incline of the deck. The default duration for each program is 30 minutes, but you can adjust this as you like.

The console also makes available a HRC program and a Body Fat Test. These can also be accessed via the “Prog” button. The HRC program will prompt you to select a desired heart rate target and will adjust the speed of the belt automatically in order to keep you close to the selected HRC value. The HRC program does not adjust the incline, but you can make incline adjustments automatically while running this program. The Body Fat Test will prompt you to input your data such as height, weight, and age. Based on this data, it will calculate your body fat percentage. This can help you set your workout goals to the ideal body mass.

Two other notable console features are the integrated sound system and the bottle holders. The sound system consists of two speakers and an AUX input on the right side of the console. You can connect your smartphone or tablet via cable to the console in order to play your music through the console speakers. The two bottle holders are placed right under the speakers. They have a fairly large diameter and should be able to accommodate any type of hydration bottle.

Assembly and Maintenance

The treadmill comes pre-assembled and folded. You only have to unfold it, secure the two upright bars into position, add the base joint covers, adjust the belt tension (if necessary), and lubricate the deck. The manual provides clear instructions for all these steps and a set of tools is also included.

For maintenance, the treadmill’s belt should be kept clean to prevent any debris to be caught into the motor or into the rollers. The deck requires periodic lubrication every two months if the machine is used more than 5 hours per week, or every six months if it is used for less than 3 hours per week.

The Pros

  • Sturdy construction – can support users up to 285 lbs;
  • Folding deck, space-saving design;
  • Transport wheels;
  • Cushioned deck for a low impact ride;
  • Automatic incline (0%-15%);
  • Speed settings up to 11 MPH;
  • Speed adjustment increments of 0.1 MPH;
  • Quick keys for speed adjustment for multiple speed settings;
  • Pulse reading function;
  • Bottle trays built-in the dashboard;
  • 9 preset workout programs;
  • HRC program;
  • Body Fat Test program;
  • Goal settings for time, distance, and calories;
  • LED backlight on the console display;
  • Very easy to assemble;
  • Little maintenance required.

The Cons

  • No tablet holder;
  • No USB charging port for your device;
  • No online connectivity.


The Sunny Health & Fitness SF-T7873 is a motorized treadmill made for home use. It is equipped with a 2.5 HP motor featuring a speed range of 0.6-11 MPH, an automatic incline system with 15 levels, and a console with multiple workout programs. It also has a folding deck. It’s a pretty decent machine for medium to high-intensity cardio workouts, muscle toning, stamina development, and weight loss. It’s not the most affordable treadmill in this feature range but does offer fairly decent quality for the price.

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