Thermophore MaxHEAT Plus Automatic Moist Heating Pad — Large 14" × 27" (Model 355)
The Moisture-Plus cover Thermophore at our most accessible price. Constant-Comfort™ hands-free switch with 3 heat settings, weighted construction, up to 165°F, 25-minute auto shutoff. The Moisture-Plus cover includes a cloth you can dampen and insert for supplemental moisture in dry or heavily air-conditioned environments. Same professional-grade moist heat trusted by doctors and therapists for decades.
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I've been using your pads for decades! I always recommend my clients have one in the selfcare first aid box. I'm always satisfied!
Our Take: The MaxHEAT Plus 355 is the most affordable way to get the Moisture-Plus cover. Same 14" × 27" large pad, same weighted construction, same Constant-Comfort™ hands-free switch with 3 heat settings (Low/Medium/High), same 165°F max, same 25-minute auto shutoff. The difference from the standard MaxHEAT 155 is the cover: the Moisture-Plus cover on the 355 lets you add a damp cloth inside for supplemental moisture in dry or heavily air-conditioned environments. Standard Thermophore covers rely on ambient humidity and work perfectly in most homes. But if you live in a desert climate, run heavy A/C, or work in a low-humidity clinical space, the Moisture-Plus cover helps ensure consistent moist heat every session. If you want this same Moisture-Plus cover with USA assembly, the Liberty II Plus 355 is the upgrade. If you don't need the Moisture-Plus cover, the MaxHEAT 155 delivers the same core performance with the standard cover.
Why You'd Choose the MaxHEAT Plus 355
- The Moisture-Plus cover produces automatic moist heat from ambient humidity like all Thermophore covers. It also lets you insert a damp cloth for supplemental moisture in very dry or heavily air-conditioned environments.
- The MaxHEAT Plus 355 is the most affordable Thermophore with the Moisture-Plus cover. If you want this same cover with USA assembly, the Liberty II Plus 355 costs more.
- Thermophore's patented Constant-Comfort™ switch gives you hands-free control. Press once to select Low, Medium, or High — the pad stays at your chosen setting until the 25-minute auto shutoff.
- Generic drugstore pads max out at 120–140°F. The MaxHEAT Plus 355 reaches up to 165°F on High for deep, therapeutic moist heat that penetrates muscles and joints.
- The weighted construction molds to curves and joints, maintaining full surface contact for consistent heat delivery. It stays in place and contours to your body better than lightweight pads.
- Nearly twice the size of many drugstore pads. Covers the full back, wraps around a hip or thigh, or drapes across both shoulders.
- Moist heat therapy is a proven drug-free method to relieve pain from arthritis, back pain, muscle spasms, fibromyalgia, and sports injuries without pills or side effects.
- The MaxHEAT Plus 355 qualifies for Health Savings Account and Flexible Spending Account purchases. It is also approved for Medicare and insurance reimbursement when prescribed for arthritis pain management.
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Perfect For
- People in dry climates, desert environments, or heavily air-conditioned spaces
- Therapists and clinicians who want reliable moist heat in any treatment room
- Back pain, arthritis, sciatica, fibromyalgia, muscle spasms
- Buyers who want the Moisture-Plus cover at the best price
- Anyone tired of replacing cheap drugstore pads every 1–2 years
You May Prefer a Different Model If…
- You want this Moisture-Plus cover with USA assembly → Liberty II Plus 355 — same cover, assembled in USA.
- You don't need the Moisture-Plus cover → MaxHEAT 155 — same switch, standard cover.
- You want digital temp control up to 170°F and a 60-minute timer → Digital 655 — the hottest, most advanced Thermophore.
- You want manual press-and-hold control → Classic 055 — heats only while you hold the button.
MaxHEAT Plus 355 — Specifications
| Specification | Detail |
|---|---|
| Model | MaxHEAT Plus 355 |
| Line | MaxHEAT |
| Size | 14" × 27" (Large) |
| Best for | Back, shoulders, hips, legs |
| Weight | Weighted (comparable to ~4 lbs) |
| Max temperature | Up to 165°F (150–165°F range) |
| Heat settings | 3 (Low / Medium / High) |
| Switch type | Constant-Comfort™ hands-free switch |
| Auto shutoff | 25 minutes |
| Moist heat | Automatic + Moisture-Plus cover with cloth for dry environments |
| Cover | Moisture-Plus fleece — removable, machine washable |
| Cord length | 10 feet |
| HSA / FSA eligible | Yes |
| Medicare approved | Yes — when prescribed for arthritis |
| Warranty | 2 years |
| Brand | Battle Creek Equipment Company (est. 1931) |
Complete Thermophore Comparison
Every Thermophore moist heating pad, side by side. Find the right model for your needs.
| Feature | MH Plus 355 ★ | Lib. II Plus 355 | MaxHEAT 155 | Liberty 155 | Classic 055 | Digital 655 |
|---|---|---|---|---|---|---|
| Size | 14" × 27" | 14" × 27" | 14" × 27" | 14" × 27" | 14" × 27" | 14" × 27" |
| Max temperature | Up to 165°F | Up to 165°F | Up to 165°F | Up to 165°F | Up to 165°F | Up to 170°F |
| Switch type | Constant-Comfort™ (3-setting) | Constant-Comfort™ (3-setting) | 3-setting (Low/Med/High) | 3-setting (Low/Med/High) | Press & hold (manual) | Digital 115–170°F + timer |
| Auto shutoff | 25 minutes | 25 minutes | 25 minutes | 25 minutes | 25 min + auto-cool | Up to 60 minutes |
| Cover type | Moisture-Plus + cloth | Moisture-Plus 3-layer + washcloth | Standard fleece | Standard fleece | Standard fleece | Standard fleece |
| Moist heat | Automatic + manual moisture option | Automatic + manual moisture option | Automatic | Automatic | Automatic | Automatic |
| Weighted | Yes | Yes (~4 lbs) | Yes (~4 lbs) | Yes (~4 lbs) | Yes (~4 lbs) | Yes (heaviest) |
| Assembled in | China | USA | China | USA | China | China |
| Warranty | 2 years | 2 years | 2 years | 2 years | 2 years | 2 years |
| HSA / FSA | Yes | Yes | Yes | Yes | Yes | Yes |
| Price | $79.95 | $89.99 | $63.97 | $74.99 | $60.43 | $124.99 |
| Shop | ★ This Product | Shop Lib. II Plus 355 | Shop MaxHEAT 155 | Shop Liberty 155 | Shop Classic 055 | Shop Digital 655 |
All Thermophore pads produce automatic moist heat without adding water. All include a washable cover, 10-foot cord, and 2-year warranty. All are HSA/FSA eligible. Prices are current Thermophore.com prices and may vary.
Frequently Asked Questions
What is the Moisture-Plus cover and how is it different from other Thermophore covers?
The MaxHEAT Plus 355 comes with a Moisture-Plus cover that produces automatic moist heat from ambient humidity like all Thermophore covers. But in very dry or heavily air-conditioned environments where there is not enough humidity in the air, the Moisture-Plus cover allows you to add a moist cloth for additional moisture. This makes the 355 the most versatile Thermophore cover for any climate or environment.
What is the difference between the MaxHEAT Plus 355 and the MaxHEAT 155?
Both are 14 by 27 inches, weighted, with 3 heat settings, 25-minute auto shutoff, and up to 165 degrees Fahrenheit. The key difference is the cover. The MaxHEAT Plus 355 includes the Moisture-Plus cover that lets you add a moist cloth in dry climates. The MaxHEAT 155 has the standard fleece cover that relies entirely on ambient humidity. Both use the Constant-Comfort hands-free switch.
What is the difference between the MaxHEAT Plus 355 and the Liberty II Plus 355?
Both the MaxHEAT Plus 355 and Liberty II Plus 355 share the same Moisture-Plus cover, Constant-Comfort switch, 3 heat settings, and 25-minute auto shutoff. The Liberty II Plus 355 is assembled in the USA at the Thermophore facility in Fremont, Indiana and costs more. Choose the MaxHEAT Plus 355 if you want the Moisture-Plus cover at a lower price. Choose the Liberty II Plus 355 if USA assembly matters to you.
How does the Thermophore produce moist heat without adding water?
The fleece cover absorbs moisture from the humidity in the surrounding air. When the pad heats up, it activates that moisture into therapeutic steam that penetrates deeper into muscles and joints than dry heat alone. No water, spray bottles, or damp towels are needed. The cover produces moist heat for 20 to 30 minutes, after which it begins to dry out and the pad should be set aside to regain moisture from the air. In very dry environments, the Moisture-Plus cover lets you add a moist cloth for supplemental moisture.
Why does the pad shut off after 25 minutes?
The 25-minute auto shutoff is a safety feature. Thermophore pads reach higher temperatures than generic brands, so limiting exposure to 25 minutes at a time provides safe, effective relief without risk of skin damage or overheating. This follows clinically recommended therapy intervals of 15 to 30 minutes. It also prevents burns if you fall asleep with the pad on.
Is the Thermophore MaxHEAT Plus 355 HSA or FSA eligible?
Yes. The Thermophore MaxHEAT Plus Model 355 is HSA and FSA eligible. It is also approved for Medicare and insurance reimbursement when prescribed for arthritis pain management. Check with your insurance company to verify reimbursement, which can vary by coverage.
Can I lay on this heating pad?
No. It is not recommended to lay on this or any heating pad. The pad is designed to be placed on top of the body area being treated. Laying on a heating pad can trap heat against the skin and increase the risk of burns. The weighted design ensures the pad stays in place and maintains full body contact without the need to lay on it.
Questions? Sales: 1-800-403-8285 · Warranty: 1-800-253-0854
Thermophore.com is managed by HRM USA Inc, 49 Richard Rd, Warminster PA 18974.
Owned by Battle Creek Equipment Company, est. 1931.