Dragon Agro Products

LB WHITE GREENGRO HEATERS
DESIGNED SPECIFICALLY FOR GREENHOUSES

The GreenGro’s advanced, clean burning design offers 20% better fuel efficiency than traditional vented heaters. The GreenGro'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 GreenGro 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 or seasonal (year-round) efficiency, the GreenGro outperforms even the most advanced competitive products for a lot less money (see table below)

For new installations, do it right the first time by installing the Greengro series heaters. For existing greenhouses, use your existing heater as a backup and use the Greengro 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 GreenGro, 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, GreenGro heaters offer a comprehensive one-year product warranty plus a 10- year warranty against heat chamber and case corrosion.

CO2 Enriched Environment
The GreenGro 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 GreenGro heaters include:
■ Dependable, fuel efficient spark ignition
■ Quick response on-demand heat
■ Powerful long reaching blower fan
■ Easy integration with building controls

GreenGro 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 GreenGro 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

GREENGRO HEATER SPECIFICATION

Ventilation Requirements
All heaters require ventilation for proper operation. The L.B. White GreenGro is no different. The GreenGro requires 2.5 CFM per 1000 Btu/h of air exchange. For a GreenGro 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 GreenGro 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.

Motorized Inlet Shutter	Air Inlet Transition	Exhaust Shutter	Power Exhaust

Indoor Ventilation Installation	Outdoor Ventilation Installation

INDOOR MOUNTING TRANSITION KIT

GreenGro Greenhouse Heater and Accessory Prices

	Item	Desription	Price
	PORTABLE FORCED AIR HEATER - High temperature output for small to large construction sites. Variable heat output. Electronic ignition, continuous self-diagnostics (on ULTRA models), heavy duty construction, 1 year warranty. CSA models certified for USA and/or Canada. Require 115V AC supply
	Tradesman 100	100k BTUH, LPG	$269
	Tradesman 155	155k BTUH, LPG	$485
	Tradesman 155N	155k BTUH, NG	$535
	Tradesman 400	400K BTUH, LPG	$816
	Tradesman 155 Ultra	155K BTUH, LPG	$535
	Tradesman 155N Ultra	155K BTUH, NG	$585
	Tradesman 400 Ultra	400K BTUH, LPG	$866
	Tradesman K70	70K BTUH, Kerosene	$372
	Tradesman K165	165K BTUH, Kerosene	$647
	Tradesman K350	350K BTUH, Kerosene	$2,310
	Tradesman K600	600K BTUH, Kerosene	$3,078
	Tradesman 100 variable down to 50% of BTUH rating. Thermostat control not available on this unit. Most Tradesman units include thermostat.
	DUCTABLE HEATERS -Great for small work spaces, renovation jobs and applications where low noise is important and heat needs specific direction. Can be used inside or ducted from outside. Automatic thermostat for better temperature control and consistent warmth. Model P350DF operates on dual fuel, either LP-Gas or natural gas. CSA certified for U.S. and/or Canada. Require 115V AC supply
	Premier 80	80K BTUH, LPG	$1,331
	Premier 80N	80K BTUH, NG	$1,453
	Premier 170	170K BTUH, LPG	$1,932
	Premier 170N	170K BTUH, NG	$2,107
	Premier 170DF	170K BTUH, LPG/NG	$2,260
	Premier 350	350K BTUH, LPG	$3,436
	Premier 350N	350K BTUH, NG	$3,756
	Premier 350DF	350K BTUH, LPG/NG	$4,898
	All units include thermostatic control Premier 350 LPS and NG units include two-stage heat output
	CONVECTION HEATERS Designed and built to handle heating needs in sites that lack electricity. Lightweight and portable. Available in both horizontal and vertical models. Cast iron burner and heavy duty steel construction. Models include the lightweight Workman models and heavy duty Norseman models.
	Workman 100 plus	100K BTUH, LPG	$164
	Workman 225 plus	225K BTUH, LPG	$164
	Workman 100N plus	100K BTUH, NG	$253
	Norseman 250	250K BTUH, LPG	$222
	Norseman 200 plus	200K BTUH, LPG	$241
	Norseman 200 Horizontal	200K BTUH, LPG	$264
	Workman Units have variable heat output Workman 100N plus runs on low pressure and does not include gas hose
	INDIRECT-FIRED HEATERS
	Director 100	80K BTUH , Kerosene, vented	$2,472
	Director 300	300K BTUH, Kerosene, vented	$3,380
	Exhaust pipe extension and rain cap are required for proper operation of heater. Refer to Accessory price sheet
	CIRCULATING HEATERS - Ideal for heating large areas. Combines large BTU output with high volume circulating fan. Dependable and designed to withstand long hours of operation. Simple to maintain. Pilot light ignition. Adjustable output. Auto gas safety shutoff.
	Jet 200	200k BTU/hr LPG	$837
	Jet 200-T*	200k BTU/hr LPG	$1,152
	Twin Jet-400	400K BTU/hr LPG	$1,370
	Twin Jet-400-T*	400K BTU/hr LPG	$1,727
	Big Bertha Jet-400	400K BTU/hr LPG	$1,259
	Big Bertha Jet-365N	365K BTU/hr NG	$1,528
	* Includes Thermostatic Control

Frequently Asked Questions

1.. What is the difference between thermal efficiency vs Seasonal Efficiency ?

Thermal efficiency means the difference between heat or energy input and heat output and is dependent on the design and construction of the heater and fuel source. For direct fired heater such as the LB White Greengro Series designed and constructed exclusively for greenhouses, it is designed to extract as much heat as possible from propane or natural gas and put it in the greenhouse and which is 99.99% efficient, Whatever heat thats produced goes inside the greenhouse, the other 0.001% consist of product of combustion such (water vapor, (CO, CO2, NO2, NOX, ethylene etc) which are well below the US standard for Heater Discharge. For the conventional gravity or power vented heaters, thermal efficiencies are only 80% because of the heat exchanger. It means that 80% of the heat goes into heating the greenhouse while the other 20% is vented outside of the greenhouse. That is money wasted into heating the air outside of the greenhouse.

Seasonal Efficiency takes into account the air intake required to support combustion and exhaust required to vent any undesired products due to the limitation and design deficiencies of the heater.. For conventional heaters using gravity vent or power vent, the greenhouse will have a negative pressure as outside air are being drawn inside the greenhouse through any openings inside the greenhouse that outside air could find and through the heater and out of the smoke stack or heater vent. Since the smoke stack is always open, the cold outside air will always be drawn inside the greenhouse until the inside pressure is equilized with atmospheric pressure. As for the LB WHite GreenGro series, fresh air is drawn through the powered air intake, heated and blown inside the greenhouse. This action pressuries the greenhouse. Depressuriation depends on how tight or loose the greenhouse just like an inflated balloon, If you looked back at the seasonal efficiency table , the LB White GreenGro Series still has the highest efficiency compared to the conventional gravity or powered vent system.

2. Why do I need to have the Ventilation kit with the GreenGro heaters?

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 GreenGro ventilation is no different. The GreenGro 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 GreenGro 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 GreenGro 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 GreenGro requires 2.5 CFM per 1000 Btu/h of air exchange. For a GreenGro 220, this translates to 550 CFM of air exchange for an indoor installation, and 220 square inches of exit area for an outside mount. If your greenhouse already has exhaust louvre next to exhaust fan and the greenhouse is not tight, then the power exhaust fan is not required. Similarly, a GreenGro 120 requires 300 CFM per indoor mount, and the equivalent of 120 square inches of exit area per outdoor mount.

3. My greenhouse has an existing vented-heater and I plan to use the GreenGro as my primary heater and the existing heater as a backup. Since my existing heater already has an exhaust stack, do I still need the ventilation kit?

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. Tthe 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 (power intake a must and power exhaust for inside installation of GreenGro heater if the greenhouse is tight and does not have any exhaust louver next to an exhaust fan.and power intake and shuttered exhaust louver for outside installation of GreenGro heater). If your greenhouse already has exhaust louvers and exhaust fans and the greenhouse is loose, all you need is the power intake as fresh air is always required when the heater is firing.

4. Do I need to have a permit to install the Heaters ?

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..

5. Can I install the heaters myself ?

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.

6. What do I need for a complete system?

A . Heater, mounting/ventilation kit or email dragon@dragonagro.com or call sales at 1-732-297-2829 for specifics.

7. How long would it take to have my order shipped?

About 1 to 2 weeks directly from the factory during the off season , longer during the Heating Season.

8. What about warranty ?

One-year product 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..

9. How do I know which size heater and quantity to use?

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.

10. When is the best time to purchase and install the heaters.

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.

Do you have any questions that weren't answered here?

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.
Back to Supplies