RZH – Root Zone Heating System

$2,699.00

The RZH module connects directly to your locally sourced water heater. Heated water is circulated through BioTherm’s Roll’N Grow Mat, with plants placed directly on top for efficient root zone warming. A media temperature sensor communicates with the head unit to automatically cycle the system on and off, maintaining the optimal growing temperature. The RZH operates using gravity pressure, so it’s essential that all components—benches, beds, and piping—remain below the water fill level of the RZH head unit. Roll’N Grow Mat is sold separately and can be made to your custom size. **Water heater not included**
Additional information

Key Features

  • Energy Efficient: Uses lower water temperatures to achieve optimal root zone conditions, reducing energy usage compared to air heating.

  • Precise Control: Built-in temperature sensor ensures consistent media temperatures.
  • Compact Design: Ideal for small-scale operations or bench heating zones.

  • Gravity-Operated: No pump required—uses natural water flow to circulate heat.

  • Compatible with Roll’N Grow Mats: Flexible, durable mats provide even heat distribution.

BioTherm’s RZH-1 is an entry level, low cost, plug-n-play system to provide bottom heat up to 500 sq ft @ 60 BTU/sq.ft. The RZH-1 module is attached to a standard water heater, purchased locally. Hot water is pumped through BioTherm’s Roll’N Grow® Mat. Plants are placed directly on the mat. The RZH™ can heat up to 500 sq.ft. of growing area.

Easy Installation
Plug & Play
Entry-level, reliable root zone heating
Enhanced root growth
Cost-effective over electric heating mats

  • Locally acquired domestic gas-fired hot water heater (40,000 BTUH input)
  • 115V single-phase service

How it Works

The RZH module connects directly to your locally sourced water heater. Heated water is circulated through BioTherm’s Roll’N Grow Mat, with plants placed directly on top for efficient root zone warming. A media temperature sensor communicates with the head unit to automatically cycle the system on and off, maintaining the optimal growing temperature. The RZH operates using gravity pressure, so it’s essential that all components—benches, beds, and piping—remain below the water fill level of the RZH head unit.  

Why Root Zone Heating?

Root zone heating is a proven system for starting your plants and growing on. Plants respond to media temperature control with faster, more robust growth.

Enhanced Plant Growth

Optimized root health leads to stronger, more resilient plants that can better withstand varying climatic conditions

Energy Efficiency

Operational savings are realized through lower energy bills and sustainable practices that contribute to environmental conservation

Reduced Disease Risk

Healthier plant conditions decrease the need for chemical interventions, promoting a more natural growth environment and reducing chemical use costs

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With over 44 years of unparalleled experience, BioTherm has been at the forefront of revolutionizing greenhouse climate technologies. Our mission is to empower growers to craft their own ideal weather, fostering the perfect ecosystem for plants to not only grow but thrive.

Let’s Grow Together

With over 44 years of unparalleled experience, BioTherm has been at the forefront of revolutionizing greenhouse climate technology. Our mission is to empower growers to craft their own ideal weather, fostering the perfect ecosystem for plants to thrive.