Ultra-Heat AMM3600 Dual Voltage RV Holding Tank Heater 12V DC/120V AC 40 Gallon

The Ultra-Heat AMM3600 is a dual voltage RV holding tank heater designed to prevent freeze-ups in fresh water, gray water, and black water holding tanks during cold weather conditions. This versatile heater pad can operate on either 13.5V DC or 120V AC power, making it ideal for both travel and stationary use.

Key Features:

• Protects holding tanks up to 40 gallons (151 liters)
• Dual voltage operation: 13.5V DC (121.5 watts, 9 amps) or 120V AC (112.8 watts, 0.94 amps)
• Built-in thermostat maintains tank contents between 44°F and 64°F
• Tested to protect down to -11°F (-24°C) on exposed tanks
• Peel-and-stick installation with proprietary adhesive that strengthens over time
• Dimensions: 12 inches wide x 24 inches long
• Thermostatically controlled with automatic cycling for power savings

The Model 3600 was the first UltraHeat panel designed for the retail aftermarket and remains the most popular choice for retrofitting RV holding tank systems. Its dual voltage capability allows RVers to operate on DC power while traveling (when electrical demand is low) and switch to AC power at campsites to reduce converter load. The proprietary adhesive backing creates a molecular bond that actually increases adhesion properties over time, ensuring reliable long-term performance. UltraHeat has been the RV industry standard since 1991 and is archived as an "Industry Changing Product" in the RV Hall of Fame.