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| Guardian Heaters |
LB WHITE THERMA GROW HEATERS
DESIGNED SPECIFICALLY FOR GREENHOUSES
The Therma Grow’s advanced,
clean burning design offers
20% better fuel efficiency than
traditional vented heaters.
The Therma Grow's patent-pending design combines
advanced performance and superior fuel efficiency
to reduce energy costs and grow profits. Unlike
conventional vented heaters that exhaust 20% of
heated air straight out the stack, the Therma Grow converts
99+% of its fuel into clean heat energy. So you get
more heated air into the house per fuel dollar.
Whether you are comparing thermal conversion. Tthe Therma Grow
outperforms even the most advanced competitive
products for a lot less money (see table below). Please note: GreenGro Heaters has been discontinued and replaced by Therma Grow Heater
Manufacturer | LB White | Modine | Modine |
Model | Therma Grow | Effinity | Power Vented |
BTU Input | 220,000 | 215,000 | 200,000 |
Thermal Efficiency | 99.9% | 93% | 80% |
BTU Output | 219780 | 199950 | 160000 |
List Price | $1239 | $4152 | $1365 |
Capital Cost per BTU | $0.0006 | $0.02 | $0.008 |
For new installations, do it right the first time by installing the Therma Grow series heaters. For existing greenhouses, use your existing heater as a backup and use the Therma Grow heaters as your primary heater. With the redundant heaters, you might be able to save on your crop insurance premium.
Trouble-free Performance Backed by a 10-Year Warranty
With the Therma Grow, fully enclosed electronic controls,
gas valve and motor are standard. There's no
expensive heat exchanger to fix or replace. Safety features include a totally enclosed flame, built-in
temperature protection and air flow safety devices. With heat treated, corrosion resistant components and a
heavy gauge steel cabinet, Therma Grow heaters offer a
comprehensive one-year product warranty plus a 10- year warranty against heat chamber and case
corrosion.
CO2 Enriched Environment
The Therma Grow not only saves you money on heating
costs; it also delivers all the benefits of a highly efficient
CO2 generator, providing 1250 ppm concentration in
only 15 minutes of full output (Plants grow bigger).
All delivered through an advanced, clean burning
design that outperforms all U.S. greenhouse combustion
and safety standards for CO, NO2, CO2 and ethylene. As Water vapor is also part of the combustion byproduct, the heat generated is humid heat instead of dry heat as found in vented heaters.
Superior Heat Management
Offered in both 220,000 and 120,000 Btu/h propane or
natural gas models, all Therma Grow heaters include:
■ Dependable, fuel efficient spark ignition
■ Quick response on-demand heat
■ Powerful long reaching blower fan
■ Easy integration with building controls
Therma Grow Plus models offer several additional features for
even greater fuel and heat management efficiency, including:
■ Two stage temperature control
■ Heating and air circulation modes
■ Tri-Shield triple coated protection
against case corrosion
Indoor or Outdoor Installation
The Therma Grow is the only greenhouse heater that offers you
the choice of inside or outside installation.
■ Efficient cabinet design offers multiple indoor location
options
■ Easy to install outdoor mounting kit saves growing space
Description |
List Price , 2024 | Your Price* |
Therma Grow 120 w/ Outside Mounting/Ventilation kit | $1662 | Call |
Therma Grow 120 w/ Inside Mounting/Ventilation Kit | $2273 | Call |
Therma Grow 120 Plus w/ Outside Mounting/Ventilation Kit | $1783 | Call |
Therma Grow 120 Plus w/ Inside Mounting/Ventilation Kit | $2396 | Call |
Therma Grow 220 w/ Outside Mounting/Ventilation kit | $2122 | Call |
Therma Grow 220 w/ Inside Mounting/Ventilation Kit | $2610 | Call |
Therma Grow 220 Plus w/ Outside Mounting/Ventilation Kit | $2245 | Call |
Therma Grow 220 Plus w/ Inside Mounting/Ventilation Kit | $2733 | Call |
* When paying by Money Order or Check (subject to 5 to 10 business days clearance) or wire transfer (Add $25). Please add Ground Shipping & handling to cost of products. Credit Card Add 3% to total. Inquire for discount schedule on volume purchases. Since we're a high volume distributor, we're passing the savings to you.
Manuals:
Therma Grow 120
Therma Grow 120 Plus
Therma Grow 220
Therma Grow 220 Plus
Therma Grow Ventilation
Therma Grow HEATER SPECIFICATION
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120 or 120 Plus | 220 or 220 Plus | ||
Btu/h Rating (Input/Output): | |||
Maximum | 120,000 | 220,000 | |
Intermediate (Plus Models Only) | 65,000 | 120,000 | |
Heater Configuration: | |||
Direct Spark Ignition | Yes | Yes | |
Centrifugal Blower Fan | Yes | Yes | |
Air Movement (cfm): | 1,100 | 1,750 | |
Heat / Air Circulation Switch: | |||
Therma GrowTM | - | - | |
Therma GrowTM Plus | Yes | Yes | |
Inlet Gas Supply Pressure: | |||
Propane min./max. (in. w.c.) | 11 / 13.5 | 11 / 13.5 | |
Natural Gas min./max. (in. w.c.) | 7 / 11 | 7 / 11 | |
Fuel Consumption: | |||
Liquid Propane Gas (lbs./hr.) Max / Intermediate | 6.8 / 3.0 | 10.2 / 5.6 | |
Natural Gas (cu. ft./hr.) Max / Intermediate | 117.0 / 63.0 | 215.0 / 117.0 | |
Electrical Requirements (Volts / Hz / Phase): | 115 / 60 / 1 | 115 / 60 / 1 230 / 60 / 1 | |
Starting / Continuous Amps | 11.8 / 4.5 | 17 / 7 6.7 / 2.6 | |
Combustion Air Requirements: | |||
Indoor Installation (cu. ft./min.) | 300 | 550 | |
Outdoor Installation(in2 of exit area.) | 120 | 220 | |
Combustion Performance: US Standards for Heater Discharge; |
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5 |
CO (ppm rise) | 2.5 | 2.5 |
0.5 |
NO2 (ppm rise) | 0.3 | 0.3 |
4000 |
CO2 (ppm) | 2,000 | 2,000 |
0.015 |
Ethylene (ppm) | 0.005 | 0.005 |
Air Temperature Rise (0Fahrenheit): | 110 | 120 | |
Minimum Clearance (ft.): | |||
Top / Sides / Back | 1 / 3 / 3 | 1 / 3 / 3 | |
Blower Outlet | 6 | 6 | |
Dimensions (in.): L x W x H | 30.75 x 18.25 x 28.25 | 36.0 x 22.0 x 30.0 | |
Net Weight (lbs.): | 116 | 150 | |
Steel Case Material: | |||
Therma GrowTM | Galvanized | Galvanized | |
Therma GrowTMPlus | Exclusive Tri-shield coating* | Exclusive Tri-shield coating* | |
Installation Options | |||
Indoor or Outdoor Mount | Yes | Yes | |
* Tri-shield coating consists of 3 unique protective layers including a non-corrosive hot-dipped galvanized steel, oven-cured epoxy primer and baked, thermosetting polyester. |
Ventilation Requirements
All heaters require ventilation for proper operation. The L.B. White
Therma Grow is no different. The Therma Grow requires 2.5 CFM per
1000 Btu/h of air exchange. For a Therma Grow 220, this translates to
550 CFM of air exchange for an indoor installation, and 220 square
inches of exit area for an outside mount. Similarly, a Therma Grow 120
requires 300 CFM per indoor mount, and 120 square inches of exit
area per outdoor mount.
To make installation easy, L.B. White offers several preassembled
ventilation equipment packages. The following ventilation is required
for maximum performance.
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Motorized Inlet Shutter |
Air Inlet Transition |
Exhaust Shutter |
Power Exhaust |
ITEM | DESCRIPTION | FAN DIAMETER |
REQ'RD WALL OPENING |
MOTOR HP |
VOLTS/ PHASE |
SHIPPING WEIGHT |
500-25995 | Therma Grow 120 INDOOR KIT Motorized Inlet Shutter Shuttered Exhaust Fan Air Inlet Transition Kit Air Inlet Hood Eyebolts and Chains |
- |
- |
- 1/30 hp - |
- 115V / 1phase 115V / 1phase - - |
26 lb.
|
500-25985 | Therma Grow 220 INDOOR KIT Motorized Inlet Shutter Shuttered Exhaust Fan Air Inlet Transition Kit Air Inlet Hood Eyebolts and Chains |
- - 10" - - |
- 15.5" x 15.5" 10.25" x 10.25" - - |
- - 1/30 hp - - |
- 115V / 1phase 115V / 1phase - - |
27 lb.
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500-24690 | Therma Grow 120 OUTDOOR KIT Exhaust Shutter Outdoor Mounting Kit |
- 10.5" x 10.5" |
40 lb.
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500-24688 | Therma Grow 220 OUTDOOR KIT Exhaust Shutter Outdoor Mounting Kit |
- 14.5" x 14.5" |
50 lb.
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Indoor Ventilation Installation |
Outdoor Ventilation Installation |
INDOOR MOUNTING TRANSITION KIT
Therma Grow Greenhouse Heater and Accessory Prices
ITEM# | DESCRIPTION | LIST PRICE | YOUR PRICE |
TEMPERATURE CONTROL | |||
500-09381 | Thermostat kit NEMA 4X | $82 | Call |
550-23778 | Thermostat kit, 2 Stage Nema 4X (Use with plus models)* | $143 | Call |
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.…
Guardian heaters are available in CSA U.S. and Canada certified models.
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 |
Hot Surface Spark |
Hot Surface |
Hot Surface |
Electrical Supply (Voltz/Hz/Phase) |
115/60/1 | 115/60/1 | 115/60/1 | 220/60/1 |
Motor | 1/12 H.P. |
1/8 H.P. 1100 RPM |
1/3 H.P. 1100 RPM |
1/2 H.P. 1100 RPM |
Dimensions |
L = 21.3" |
L = 29.5" |
L = 30.8" |
L = 36.0" |
Cabinet | Steel with Tri-shield Coating |
Steel with Tri-shield Coating |
Galvanized Steel | Galvanized Steel |
CSA Certified |
Yes |
Yes |
Yes |
Yes |
⚠ WARNING: When operating, this heater produces chemicals, including Carbon Monoxide, known to the State of California to cause birth defects and other reproductive harm. For more information go to www.P65Warnings.ca.gov.
All heaters require ventilation to support combustion and for proper operation. In the conventional gravity or power vented heaters, ventilation are built-in to the greenhouse as the heater is using the inside air and of course outside air being drawn inside the greenhouse for combustion and 20% or more of the heat and the product of combustions (CO, CO2, NO2, NOX, ethylene etc) are vented in the atmosphere which results in inefficiency. Also, once the vented heaters are operational, to keep the presure/air balance, cold air is being drawn from any infiltration in the greenhouse further reducing the inefficiency to 65-78% efficiency. In dollar terms, if you're spending $10,000 for the heating season, $6,500 to $7,800 are being spent in heating the plants while $2,200 to $3,500 are being wasted into thin air. Any leaks from the heater to the smoke stack for a vented heater inside the greenhouse would be devastating to the plants. The same can be said of any leaks from either natural gas or propane inside the greenhouse.
For a direct-fired heater like the L.B. White Therma Grow ventilation is no different. The Therma Grow still need air to support combustion, however, since it is direct fired, all the heat and the product of combustion (water vapor, CO,CO2, NO2, NOx, ethylene etc ) are all released directly inside the greenhouse so that no heat is wasted hence the 99.9% efficiency. However, as the Therma Grow heater keeps on running , it uses the air inside the Greenhouse to support combustion but in so doing, without any fresh air/oxygen and exhaust to keep the pressure/air balance, oxygen consumption is is being depleted there would be a build up of combustion byproducts like carbon monoxide and specially ethylene where the plants are sensitive to. Even if the Therma Grow is designed to be 99.9% efficient, there is still the matter of the 0.1% unburned fuel. In order to mitigate the buildup of ethylene and unburned fuel which is damaging to the plants, fresh air intake and to maintain the required air exchange, exhaust are required. The Therma Grow requires 2.5 CFM per 1000 Btu/h of air exchange. For a Therma Grow 220, this translates to 550 CFM of air exchange for an indoor installation, and 220 square inches of exit area for an outside mount.
You may think that your 6" to 10" smoke stack is large enough for the exhaust. but if you look at your existing exhaust stack, its connected to the heater, heat exchanger, burner and finally the burner motor. The motor for the burner has some adjustment to calibrate the amount of opening to draw in surrounding air/oxygen with the fuel mixture for optimum combustion. The opening is small and is insufficient for proper exhaust. Therefore, you'd still need the ventilation kit.
A .For new greenhouses, in addition to the building permit, you might as well apply for permits for the installation of heaters, gas tanks, gas lines. Check with your local building officials to the requirements..
A. Its best to have the heaters installed by licensed contractors from mechanical, piping and electrical standpoint. Being professionals, they should be able to comply with all necessary and safe installation in accordance with the latest building code.
A . Heater, mounting/ventilation kit or email or call sales at 1-908-208-4767 for specifics.
Normally they're stock items and would be shipped the next day. Transit time for ground shipping is another 3 to 5 days. If stock runs out, About 1 to 2 weeks directly from the factory during the off season.
For LB White Products: One-year product manufacturers warranty plus a 10- year warranty against heat chamber and case corrosion from date of purchase. Customer to be responsible for shipping to/from factory for parts.
A . Everything boils down to the size and materials use of your greenhouse, its geographical location, setpoint you'd like to maintain and your dealer would be able to size it for you.
A The best time to purchase and install the heater/s is just after the heating season. Lead time is much shorter and its more relaxing for the installers.
Send us some email! We'll be happy to answer any questions you have.
Please inquire for shipping cost.
As a reminder, sales tax will be charged when it is shipped in New Jersey.
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Dragon Agro Products
PO BOX 33
Kendall Park, NJ 08824-0033
Tel 1-908-208-4767
www.dragonagro.com
email: dragon@dragonagrodotcom
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