Description

UniHeat 20 Hour Heat Pack (Shipping Warmer)

The UniHeat 20 Hour Heat Pack (Shipping Warmer) is designed for short-duration shipments that need reliable protection from cold. It’s ideal for shipping tropical fish, aquatic plants, insects, and other temperature-sensitive items where consistent heat is needed for about one day.

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Why the UniHeat 20 Hour Heat Pack (Shipping Warmer) Matters

When shipping in cooler weather, even short trips can expose live or sensitive cargo to damaging temperature drops. The UniHeat 20 Hour pack activates on contact with air, producing steady, controlled heat for 20–25 hours — perfect for overnight deliveries or next-day air shipments.

The included red stripe marks the breathing side of the pack, where air enters to sustain the heat reaction. Always place this side facing an open air pocket inside the box (not against the wall or lid) for best performance.

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How It Performs in Transit

Based on temperature curve data, the 20 Hour warmer reaches about 150°F within 5–6 hours, maintains a steady range near 130–140°F for much of its duration, then gradually tapers off toward room temperature around the 25-hour mark.

If the pack feels flat, gently flex the pack before sealing the box to help oxygen reach the material evenly.

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Key Features

Fast Activation

Heats within 15–20 minutes of air exposure for quick, dependable performance.

Compact Size

Measures 4″ × 5.5″, fitting easily into standard shipping boxes without adding bulk.

Safe and Eco-Friendly

Non-toxic, non-flammable, and biodegradable; safe for disposal with regular waste.

Optional Adhesive Backing

Available with adhesive for secure placement inside shipping boxes.

Case Quantity

Packed 240 per case, sealed in 10-count inner bags for convenience and longevity.

*Performance may vary depending on insulation, box size, and ambient temperature. This product is intended for general temperature maintenance during shipping. Users are responsible for determining suitability for their specific application.

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Pro Packing Tip

Use inside a Styrofoam-lined or insulated box to retain warmth. For best results, pair the 20 Hour warmer with a PhazeLock PCM 23 Gel Phase Pack to maintain a stable internal temperature during shipping.
Avoid shipping on days when potential carrier delays could exceed 24 hours.

Check U.S. weather conditions before shipping to avoid extreme cold events.

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Bottom Line

Compact, fast-activating, and reliable — the UniHeat 20 Hour Heat Pack (Shipping Warmer) is the perfect choice for overnight and short-distance shipments of tropical fish, aquatic plants, and temperature-sensitive goods.

👉 Review our Best Practices for Shipping Warmers before use to ensure safe, consistent performance.

“Order today — usually ships same day on orders placed before 12PM.”