Nautilus T618 Treadmill - Review and Recommendation

Nautilus T618 Treadmill is large and sturdy home treadmill, design for even the most demanding home running workouts. It features steel frame, high capacity motor, wide and long running deck with large rollers and 3-ply belt, automatic incline, excellent deck cushioning etc.

Nautilus T618 treadmill is similar in design with Nautilus T616 and T614 treadmills, but it has better cushioning system, stronger motor and few more extra features.

Obviously, Nautilus T618 is high-end home treadmill that comes with hefty price tag, but again, 'what you pay is what you get' - excellent running, jogging and walking treadmill for exercising at the privacy of your home.

nautilus t618 treadmill 1

Nautilus T618 Treadmill Features and Specifications

When assembled and ready for use, Nautilus T618 is large treadmill with dimensions (L x W x H) of 72.4 x 35.2 x 57.6 inches (184 x 89 x 146 cm). Also, for a comfortable workouts, it also requires 2 feet (~61 cm) of free space all around the unit, except the back of the unit, where 3 feet (~91.5 cm) of free space is recommended.

Fully assembled unit weighs 253.5 pounds (~114.8 kg), due to the thick steel frame which is required for supporting maximum user weight of 350 pounds (~158.5 kg).

Although large and heavy, most of the important parts come pre-assembled, with all the tools and instructions included. However, if you are not DIY person, do yourself a favor and order a trained technician to assemble the unit for you and test it.

The maintenance is not different from other treadmills: belt and deck should be kept clean, belt should be regularly lubricated after ~25 hours of use. Also, user should periodically check for loose parts (bolts, wires etc) and similar.

Running deck dimensions are typical for home high-end treadmills (L x W): 60 x 20 inches (152.4 x 50.8 cm). Running deck is large enough to allow even people with longer strides to run comfortably for longer period of time.

Running belt is durable 3-ply 2.5 mm belt, being powered via 2.75 inch (~7 cm) rollers.

Running deck is ~9 inches (~23 cm) above the floor and with maximum incline of 15% that is additional ~9 inches from the floor - minimum ceiling height is approximately 18 inches + runner height when running (this depends on the runner height, but also his/her running style) for comfortable workout, preferably slightly more.

nautilus t618 treadmill running deck

Deck cushioning is so-called 'Rebound Deck Cushioning', which absorbs the impacts and decreases the stress on the ankles, knees and hips. Deck cushioning is based on a two pairs of shock absorbers at the front and three pairs at the rear of the running deck.

Running deck incline is motorized and can be changed automatically or manually from 0 to 15% in 1% increments.

Nautilus T618 treadmill is powered with 3.5 CHP (Continuous HP) motor, being able to support speeds from 0.5 to 12 mph (0.8 to 19 km/h) in 0.1 mph (0.16 km/h) increments.

Nautilus T618 Treadmill Console

nautilus t618 treadmill console

Nautilus T618 Treadmill console features 2 blue backlit displays.

The top, smaller (3.75") monitor displays the workout goal, user fitness score and the placement in relation to the pacer.

The bottom, larger (5.5") monitor displays the program profiles, running time, covered distance, number of laps, heart rate, burned calories, running speed, incline %, running pace.

Distance can be displayed in both miles and kilometers, while speed can be displayed in both mph and km/h.

Lap Count function displays the distance in laps of 0.25 miles (0.4 km), a very nice function to have for those that are preparing themselves for running 'track and field' event.

Nautilus T618 console support the use of chest strap heart monitor, console comes with its own sound system and cooling fan, USB charging port, 2x bottle holder and accessory tray with towel support.

Sound system support most of the MP3 players and it has two speakers. Cooling fan provides cooling during the workouts and features three speed settings.

Heart rate sensors are also available in the handles in front of the runner, but personally chest strap monitor is better since it allows the user to monitor heart rate without the need to grab the sensors on the handles.

Speed and incline can be finely tuned, but also they can be set using quick set buttons: speed from 2 to 12 in 2 mph increments and incline from 0 to 15% (0%, 2%, 5%, 8%, 10%, 13%, 15%).

Safety features include large Pause/Stop button and standard safety key.

Console also features 26 workout programs, divided in several groups:

nautilus t618 treadmill 2- Quick Goal: allows the user to set up an exercise goal, like covered distance, running time and burned calories.

- Heart Health: offers four preset target heart rates, for 55%, 65%, 75% and 85% heart rate.

- Weight Control: unit offers five preset workouts, including Fat Burn 1, Fat Burn 2, Speed Burn, Incline Burn and Dual Burn.

- Interval: offers three preset workouts, including Interval-Incline, Interval-Speed and Interval-Dual.

- Train program: six more workout programs including Boot Camp, Endurance, Performance, 1 Mile Pacer, 5k Pacer and 10k Pacer.

- Custom: unit offers four customizable programs, for heart rate, incline, speed.

 Nautilus T618 User Profiles and Connectivity

Nautilus T618 treadmill support up to 4 user profiles, allowing 4 users to store their age, gender, weight, height, preferred workout values and of course, the user's name.

Each profile support recording of individual workout results. Also, thanks to the stored user's data, calorie counter is much more accurate.

Along with the 26 built-in onboard programs, Nautilus T618 treadmill features online connectivity.

The console support Bluetooth, enabling the user to use the 'Nautilus Trainer 2' fitness app, or to transfer workout data to the Nautilus Connect or MyFitnessPal account.

Also, Nautilus T618 is compatible with the RunSocial online app, giving the user the possibility to view a virtual running trail based on the GoogleMaps on the smart TV, tablet or phone.

The USB port acts as a charging port for smartphone or tablet, but it also enables the user to transfer the workout data via USB flash drive to online fitness account.

 Nautilus T614 vs T616 vs T618 Treadmills

Nautilus T614, T616 and T618 are very at first similar treadmills, but they differ in several, very important details given in the following table:

Model Nautilus T614 Treadmill Nautilus T616 Treadmill Nautilus T618 Treadmill
Photo nautilus t614 table nautilus t616 table nautilus t618 table
 Bluetooth  No Yes Yes
Built-in Programs 22 26 26
Performance Tracking Goal Track Nautilus Trainer 2 Nautilus Trainer 2 
Mixed-Reality Training No RunSocial RunSocial
Running Deck 20 x 55 inches 20 x 60 inches 20 x 60 inches
Rollers 2.5 inches 2.5 inches 2.75 inches
Speed 0-12 mph 0-12 mph 0-12 mph
Motor  2.75 CHP  3.0 CHP 3.5 CHP
Maximum User Weight  300 pounds  300 pounds 350 pounds
Dimensions (L x W x H)  72.2 x 35.2 x 57.6 inches  72.2 x 35.2 x 57.6 inches 72.4 x 35.2 x 57.6 inches
Treadmill Weight 200 pounds  215 pounds 253.5 pounds
Incline 0-12% 0-15% 0-15%
Heart Rate Contact Sensors Contact and Chest Strap (included) Contact and Chest Strap (included) 
Cushioning System StrikeZone Deck Cushioning  StrikeZone Deck Cushioning  Rebound Deck Cushioning 
Belt 1-ply, 1.5 mm 2-ply, 2.0 mm 3-ply, 2.5 mm
Display Single Blue Backlit LCD Displays   Dual Blue Backlit LCD Displays Dual Blue Backlit LCD Displays 
 Warranty Motor: 10 years, Frame: 10 years, Mechanical: 2 years, Electrical: 2 years, Labor: 1 year  Motor: 10 years, Frame: 10 years, Mechanical: 2 years, Electrical: 2 years, Labor: 1 year  Motor: 15 years, Frame: 15 years, Mechanical: 5 years, Electronics: 5 years, Labor: 2 years. 
Amazon Link Nautilus T614 Treadmill Nautilus T616 Treadmill Nautilus T618 Treadmill

Note: Amazon links open in the new window, feel free to check them for most up-to-date prices and offers.

All three treadmills are great home treadmills, with strong motors, 0-12 mph speed range, large supported user weight, good cushioning etc.

Nautilus T614 treadmill has the weakest motor (2.75 vs 3.0 vs 3.5 CHP) and the smallest running deck of 20x55 inches. But, it also supports users up to 300 pounds, just like T616.

Unlike T616 and T618, T614 doesn't feature Bluetooth connectivity and hence it lacks mixed-reality training (RunSocial App). However, it also has the option of transferring the data via USB port to Nautilus Connect and MyFitnessPal accounts.

Also, T614 doesn't support chest strap heart rate monitor - it has 'only' a contact sensors.

Nautilus T616 treadmill sits between T614 and T618 regarding their features, performances, warranty and price. Although T618 comes with the highest price of all three models, it also offers the most of all three models.


Long Story Short: If you are looking for strong and durable treadmill that will serve you for years to come, consider Nautilus T618. It is large and heavy unit that should be placed on permanent position and used according to the workout schedule.

It features really strong motor, durable belt, large rollers, excellent impact absorption system, easily readable console, 4 user profiles etc.

It also comes with a nice price tag, but as said before, what you pay is what you get.

For more reviews and recommendations, check Nautilus T618 Treadmill Amazon link (link opens in the new window).