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Guardian® Forced Air Heaters

Guardian Greenhouse Heaters

20% More Efficient—A Great Option When Growing Less Sensitive Plants in Greenhouses

The Guardian’s time proven direct-fired design was specifically designed to protect your investment when the weather turns cold.

Although the Therma Grow Family of heaters works best for greenhouses as they are designed specifically for horticulture environments and are the cleanest burning direct-fired heater available today, an outdoor mounted Guardian might be a good alternative when growing less sensitive plants.

Guardians provide consistent, dependable heat for a wide range of greenhouse 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 greenhouse heating protecting your investment… L.B White.

Call our technical experts to help you select the correct size and quantity of heaters for your greenhouses.

Technical Support – 1-800-345-7200

Key Features of the L.B. White Guardian Heater
for Greenhouses

  • Range of models from 60,000 to 325,000 Btu/h
  • Spark, hot surface or pilot light ignition
  • Manually adjustable variable rate valve (50% to 100%) or fixed heat output
  • Advanced Service Saver diagnostic feature
  • Tri-Shield White or galvanized case finish
  • Outdoor installation only

Guardian heaters are available in CSA U.S. and Canada certified models.

Specifications of Guardian Greenhouse Heaters

  Guardian 60

Guardian 100

Guardian 250 Guardian 325

Btu/h Rating

30,000- 60,000 50,000- 100,000 160,000- 250,000 200,000- 325,000
Ignition Types

Hot Surface
Spark

Hot Surface
Spark

Hot Surface
Spark
Pilot

Hot Surface

Electrical Supply (Voltz/Hz/Phase)

115/60/1 115/60/1 115/60/1 220/60/1
Motor

1/12 H.P.
1700 RPM

1/8 H.P.
1100 RPM
1/3 H.P.
1100 RPM
1/2 H.P.
1100 RPM

Dimensions

L = 21.3"
W = 14.3"
H = 18.0"

L = 29.5"
W = 14.3"
H = 18.0"

L = 30.8"
W = 18.3"
H = 28.3"

L = 36.0"
W = 22.0"
H = 30.0"

Cabinet Steel with
Tri-shield Coating
Steel with
Tri-shield Coating
Galvanized Steel Galvanized Steel

CSA Certified

Yes

Yes

Yes

Yes

Guardian Greenhouse Heaters

The Guardian’s time proven direct-fired design was specifically designed to protect your investment when the weather turns cold.

Although the Therma Grow Family of heaters works best for greenhouses as they are designed specifically for horticulture environments and are the cleanest burning direct-fired heater available today, an outdoor mounted Guardian might be a good alternative when growing less sensitive plants.

Guardians provide consistent, dependable heat for a wide range of greenhouse environments.