COCOON THRMS-1-1800 Thermal Mass Duct Heater

COCOON THRMS-1-1800 Thermal Mass Duct Heater is designed to provide supplemental heating that helps stabilize indoor temperature swings and improve overall comfort in residential and commercial HVAC applications.

Unlike traditional electric duct heaters that deliver immediate on/off heat output, COCOON Thermal Mass Technology stores thermal energy and releases it gradually. This helps reduce rapid temperature fluctuations in the air stream and delivers a more consistent and stable heating output.

The THRMS-1-1800 model is designed for flexible integration into existing HVAC systems where higher heating demand, zoning correction, or airflow balancing is required without a full system redesign.

Key Benefits

• Helps stabilize indoor temperature swings by smoothing heat delivery in the air stream
• Provides supplemental heating support for larger or uneven HVAC zones
• Reduces hot and cold fluctuations in delivered air for more consistent comfort
• Uses Thermal Mass Technology to store and release heat more consistently than standard electric duct heaters
• Improves overall comfort by supporting existing HVAC system performance rather than replacing it
• Designed for flexible installation in vertical, horizontal, or downflow configurations
• Integrates into existing ductwork with minimal system modification
• Compatible with grid power, solar, backup generators, and hybrid energy systems
• No venting required
• Suitable for residential, commercial, and specialty HVAC applications
• Engineered and manufactured in the United States

General Specifications

THRMS-1-1800-R-P4-USA&CA

Energy Source: Electric Grid, Solar, Wind, Hydro, Backup Generator, or Hybrid Energy Systems

Venting Required: None

Emissions: None

BTU Capacity: 61,074 BTUs

Active BTU: 36,851 BTUs

Stored BTU: 24,222 BTUs

Active KW: 10.8

Number of Circuits: 1

Number of Circuit Breakers: 1

Voltage: 208-240V / 480V

Hertz: 50 / 60

Full Load Amps: 45

Maximum Overcurrent Protection: 60 Amps

Minimum Circuit Ampacity: Per NEC and local codes

Circuit Ampacity: 50 Amps

Recommended Breaker: 60 Amps

Installation Orientation: Vertical, Horizontal, Downflow

Electrical Phase: Single Phase standard (Three Phase available, contact for availability)

Unit Dimensions: 18 x 24 x 36 in

Product Weight: 75 lbs

Shipping Weight: 95 lbs

Safety Listing: UL Listed File Number SA44706

Warranty Information

• 1-Year, 5-Year, and 10-Year Limited Warranty Options
• 10-Year Heat Exchanger Warranty
• See Warranty Documentation for Complete Details

Shipping Information

Shipping Method:
LTL Freight (Where Available)

Shipping Weight:
95 lbs

Country of Origin:
United States

Application Assistance

If you have questions regarding sizing, electrical requirements, installation configuration, or application suitability, our team is available to help determine the best COCOON solution for your project. Call us at +1 314-931-1004