Known for Reliability- Durability- Serviceability- Parts Availability
Quality construction - Therma Grow forced air heaters feature a 10 YEAR WARRANTY against heat chamber and case corrosion!
- Corrosion resistance
- Made to thrive in humid horticultural environments
- Designed for ease of maintenance and repair in the field
- Superior parts access from our customer service center
- 24 hour online access to service manuals and trouble shooting videos
- Phone technical support from our team of engineers on installation, sizing and advanced trouble shooting
Up to 20% better efficiency and proven heat chamber durability
With indirect fired heating 20% of the heat goes out the chimney. With L.B. White's full line of forced air heating solutions that heat goes into your green house and straight to the bottom line.
Our Therma Grow™ and Guardian® forced air direct fired heating solutions are the new standard for efficient, reliable heating for green houses. L.B. White's technical support team makes sure you get more than a great furnace, they help you create a complete heating solution to protect your investment.
Guardian®-Forced-Air-Heaters
20% more efficient and our most economical horticultural heater
The Guardian’s time proven direct-fired design was specifically designed to protect your investment when the weather turns cold.
Its provides consistent, dependable heat for a wide range of green house environments.
L.B. White is the pioneer in direct fired heaters and with 50 years of perfecting every aspect of our design which has led to our reputation for reliability, durability and serviceability.
Our exclusive Service Saver™ monitoring simplifies trouble shooting and helps you get your heater back up and running faster and easier.
When the fate of your plants is at stake… you want the rising star in Green House heating protecting your investment… L.B White.
Call our technical experts to help you select the correct size and quantity of heaters for your green houses.
Technical Support – 1-800-345-7200
Key features of the Guardian heaters include:
- Range of models from 60,000 to 325,000 Btu/h
- Spark, hot surface or pilot light ignition
- Variable or fixed heat output
- Advanced Service Saver diagnostic feature
- Tri-Shield White or galvanized case finish
- Indoor or outdoor installation
Guardian heaters are available in CSA U.S. and Canada certified models, as well as CE Type certified and other international configurations and certifications.
Literature / Specifications
Guardian Greenhouse
Guardian Outdoor Mount Kit Brochure
Owners Manual
Guardian Forced Air AD250 Spark
Guardian Forced Air AB250 Pilot
Guardian Forced Air AW060/100 Hot Surface
Guardian Forced Air AW325 Hot Surface
Guardian Forced Air AW250 Hot Surface
Troubleshooting & Maintenance Videos
Guardian T Stat Connection
Guardian Air Proving Switch Check
Guardian Flash Patterns
Guardian Gas Pressure Check
Guardian Igniter Continuity and Voltage
Guardian Motor Voltage Check
Guardian Power to Gas Valve
Guardian High Limit Continuity
Guardian Transformer Voltage Check
Guardian T-Stat OHM Test
Guardian Gas Conversion
Guardian Spark Ignition
Guardian Pilot Orifice Changeout
Guardian Power to Motor
Guardian Pilot Gasket Changeout
Guardian Volt Meter Usage
