Setting up the C-Pack 1700 B system requires charging batteries, trimming insoles, pairing via the Thermic Heat Control App, and selecting from three heat settings.
Frozen toes on the chairlift kill the fun fast, and the Thermic boot heaters manual for the C-Pack series spells out everything needed to get heating — from charging the lithium-ion batteries to syncing them with the smartphone app for precise temperature control. The current C-Pack 1700 B model delivers up to 17 hours of warmth on its lowest setting, making it a popular choice for skiers and snowboarders who spend full days in the cold.
What The Thermic Boot Heaters Manual Covers
The official documentation for the C-Pack 1700 B and 1300 B systems covers four main areas: charging and battery setup, insole trimming and installation, Bluetooth pairing with the Thermic Heat Control App, and the three manual heat settings with their LED indicators. It also includes safety warnings about high-heat exposure and a battery reset procedure. The manual lives as a printed insert in the product box and is mirrored on the Therm-ic US support pages.
The system uses rechargeable lithium-ion packs that connect to trim-to-fit heating insoles. The heating element sits exclusively under the forefoot area — the manual makes this clear so users don’t expect calf or arch warmth. Each battery pack has a single button and an LED that communicates the current heat level through blink patterns.
Charging & Installing The C-Pack Batteries
Before first use, charge both batteries fully using the included USB-C cable and any standard USB power source — a laptop port or wall adapter works fine. A full charge typically takes a few hours and the LED glow confirms charging is in progress.
To install the Heat Flat Insoles, start by placing them inside your boots with the heating element positioned under your toes. Mark the insole at the black cross point printed on the material, then trim it to match your boot size. Route the power cord from the insole up through the boot liner so it reaches the battery pocket cleanly without pinching.
Secure the connection between the insole wires and the C-Pack battery, making sure the plug seats fully. Power on by pressing the button once — the LED lights up and the system begins heating at the last-used level. To turn the system off, hold the button until the LED extinguishes.
How Do You Pair The Thermic Boot Heaters To The App?
Pairing requires the Thermic Heat Control App, available free for iOS and Android, and Bluetooth must be enabled on your phone before opening the app.
Start by long-pressing each battery’s button for about four seconds until the LED starts blinking continuously — that signals pairing mode. Open the app and tap the + icon, then select Add and choose the product type, such as Ski Boot. You can customize the profile with a name, color, or photo to distinguish left from right.
Once paired, the app displays a slider from levels 1 to 10 and a standby button for each foot independently. If you accidentally install the battery in the wrong boot, tap the Swap button in the app to reverse the heating logic without physically swapping the packs. An internet connection is required for the initial pairing process.
The app screen shows both batteries connected with individual temperature controls and an active reading for each foot when pairing completes.
Thermic Boot Heater Models & Heat Settings
Therm-ic offers several C-Pack battery models and insole types. The table below lays out the current lineup so you can match the system to your needs. If you are comparing brands, our tested roundup of the best boot heater models covers the full market.
| Component | Key Specs | Notes |
|---|---|---|
| C-Pack 1700 B | 17 hr runtime, Bluetooth | Current flagship with app control |
| C-Pack 1300 B | 13 hr runtime, Bluetooth | Mid-range, full app support |
| C-Pack 1300 (No BT) | 13 hr runtime, no Bluetooth | Manual only, three heat levels |
| Heat Flat Insoles | Trim-to-fit, forefoot heat | Included in most bundles |
| Heat 3D Insoles | Molded design, forefoot heat | Optional upgrade for better fit |
| USB-C Charging Cable | Standard USB-C | Included, use any USB source |
| Thermic Heat Control App | iOS & Android, free | Required for Bluetooth models |
The manual heat settings cycle through three levels by pressing the battery button. One press gives Low with a long, slow LED blink. A second press reaches Medium, signaled by a long pause followed by two quick blinks. A third press hits High with a solid LED light. The app adds ten finer levels (1–10) that let you dial in the warmth between these three brackets.
Troubleshooting Common Issues
Most problems with the system trace back to battery connection, Bluetooth pairing, or trim fit. The table below covers the frequent issues and the fix that works.
| Problem | Likely Cause | Quick Fix |
|---|---|---|
| No heat from insoles | Batteries not charged or disconnected | Charge fully; check wire connections at both ends |
| One boot colder than the other | Battery installed in the wrong foot | Use the app’s Swap button |
| Can’t find device in app | Batteries not in pairing mode | Hold button 4 seconds until LED blinks |
| Battery won’t turn off | Safety mode after long hold | Hold button 30 seconds for hard reset |
| Insoles feel bulky or loose | Trim cut at the wrong spot | Re-trim at the marked cross point; do not cut wires |
| Heat feels too intense | Setting is too high for conditions | Drop to Low or app level 3 |
| App won’t connect or pair | Phone Bluetooth off or app needs reset | Enable Bluetooth; restart phone; delete and reinstall app |
The manual includes a hard-reset procedure for the batteries when they behave unexpectedly. Hold the power button for 30 continuous seconds — the LED flashes once and then turns off, which confirms the reset completed. This clears pairing data and restores factory behavior.
What Heat Setting Should You Use?
The safest and most comfortable setting for all-day wear is Low (manual) or app levels 1–3. The manual warns that high heat should only be used sparingly — more than a few minutes on High can cause discomfort or trigger the system’s safety shutdown, and the heating should feel “almost undetectable” to avoid the risk of burns.
Medium (app levels 4–7) works well for very cold days or when you are stationary on the lift. Reserve High (app levels 8–10) for quick warm-ups only, then dial back once the boots feel comfortable. The system drains battery fastest at the upper settings, so running High continuously cuts the runtime significantly below the rated maximum.
The manual notes that the C-Pack batteries are designed for boot use only and are not compatible with Therm-ic gloves or other heated clothing — each product line uses a different power connection.
From Box To Trail: The Full Setup Sequence
Here is the complete order of operations to get the Thermic boot heaters running before your next ski day:
- Charge both batteries fully via USB-C before first use.
- Trim the Heat Flat Insoles at the marked cross point to match your boot size, keeping the heating element under your toes.
- Route the insole cable through the boot liner to the battery pocket without bending or pinching the wire.
- Connect the insole plug to each C-Pack battery until it seats firmly.
- Power on by pressing the button once; confirm the LED lights up.
- Pair with the Thermic Heat Control App if using a Bluetooth model — hold the button for 4 seconds, open the app, and tap Add.
- Set the heat level to Low for all-day comfort, using the app for finer adjustment if needed.
- Check both feet are warm before heading out; use the app’s Swap button if one side feels different.
FAQs
Can you use Thermic boot heaters without the app?
Yes. Non-Bluetooth C-Pack 1300 models use the button only, and even the Bluetooth-enabled models work manually without the app — press the button to cycle Low → Medium → High → Off. The app adds fine control and individual foot adjustment but is not required for basic heat.
How long do Thermic boot heater batteries last before needing replacement?
The lithium-ion C-Pack batteries typically hold usable capacity for 300–500 charge cycles, which translates to several seasons of regular use depending on how often you charge and discharge them. Store them at room temperature when not in use and avoid leaving them at full charge for months to extend their life.
Why is only one of my Thermic boot heaters working?
The most common cause is the battery being swapped to the wrong foot — the system knows which side each battery belongs to. Open the app, tap Swap, and the heating logic reverses. If that does not fix it, check the wire connection at the insole and make sure that battery is fully charged.
Can you wash the Thermic Heat Flat Insoles?
No. The heating elements and wires are embedded inside the insole and cannot get wet. Remove the insoles from your boots and spot-clean the surface with a damp cloth if needed. Submerging or machine washing will damage the wiring and void the warranty.
Do Thermic boot heaters fit any ski boot?
The Heat Flat Insoles trim to fit most boot sizes, including men’s and women’s ski and snowboard boots. The heating element sits under the forefoot, so boots with very thin toe boxes may feel snug. The Heat 3D insoles offer a pre-molded option for a more precise fit in high-volume boots.
References & Sources
- Manuals Plus. “Therm-ic C-Pack 1700 B User Manual.” Official manual covering setup, pairing, and troubleshooting for the C-Pack 1700 B system.
- Therm-ic US. “Frequently Asked Questions — Therm-ic US.” FAQ page with battery reset procedures, compatibility notes, and safety info.
- Therm-ic. “How Does It Work.” Official product guide for Heat Flat insoles and C-Pack battery operation.
- Carv. “Best Ski Boot Heaters in 2023 — Complete Buyer’s Guide.” Industry roundup covering Therm-ic models and competitor comparisons.
- Therm-ic US. “Bundle Heated Insoles — C-Pack 1300 B.” Product page for the C-Pack 1300 B bundle with insoles and battery specs.