WHS 3200



GARN Sizing and Selection

Find out which GARN WHS is right for you

Caculator

GARN Quality for the Commercial Market

The GARN WHS 3200 is the largest unit in the very successful GARN WHS wood heating product line. It was developed for the large commercial applications. Typical GARN users cut their wood use in HALF.

Easily Connects To Your Existing Heating System

As is the case with all prior GARN WHS units, the GARN WHS 3200 units may be easily connected to forced air, hot water baseboard, European flat panel radiator and hydronic radiant floor heating systems.

Electric Thermal Storage Compatibility

A 33 KW off peak electric back up is available as an option.

Elegant Simplicity – Easy to Use and Maintain

Only TWO moving parts. Easy to use. Little to break. Load it, light it, walk away.

Wood Gasification with Storage – Clean and Efficient

During the heating season, GARN produces the lowest emission levels and highest efficiency of any cord wood burner.

Overview

The GARN WHS 3200 is a highly efficient direct-gasification cordwood burner that heats an integrated, large water volume, thermal storage tank. The GARN WHS features several technical advantages over conventional wood burning equipment:

  • Low Emissions: gasification is achieved with a unique, high-temperature, non-modulated batch burn process.
  • Simple: combustion air to the fire is not modulated, so there are no motorized dampers or blowers that cycle on and off.
  • High Efficiency: a large diameter, high surface area, 5-pass heat exchanger ensures efficient heat transfer over the life of the unit.
  • Safe: cool combustion air circulates around the combustion door keeping it cool to the touch.
Fuel and Operation

Fuel

GARN WHS can burn cord wood, slab wood, dense wood briquettes, air-dried corn on the cob, pallets and other scrap wood. Emissions information is listed and certified for cordwood fuel only.

Operation

Periodic firings are used to bring the unit’s large water volume up to approximately 195 °F. Hot water can be drawn from storage and delivered to the connected building’s heating system during firing and for hours after firing is complete. When the water temperature in the thermal storage drops below the temperature required by the connected heating system, the GARN WHS is re-loaded and re-fired and the process is repeated.

Thermal Performance

Annual Efficiency Rating…………………………….85% (HHV) / 75% (LHV)

Firing Rate1……………………………………………………………………700,000 btuh

Heat Delivered to Thermal Storage1……………………….. 1,900,000 but

Heat Output Rate…………………………………………………See Table 1 Below

1 Based on a single fuel charge of 340 lbs red oak with 22% moisture content. Values will vary based on fuel species, moisture content, and unit elevation.

There is a fundamental difference between the firing rate and output rate (building heat load).

Firing (Heat Input) Rate: the rate at which heat is added to the thermal storage from the process of wood combustion and the efficiency of the heat exchanger.

Heat Output Rate: the rate at which heat is removed from the thermal storage and delivered to the connected heating system.

With conventional wood heating systems, the equipment attempts to match the firing rate to the output rate. With the GARN WHS, the firing rate is nearly constant during the wood combustion process while the output rate varies. The operator continues to add wood until the thermal storage temperature is up to 195°F. Table 1 illustrates how long the GARN WHS thermal storage will last before the need to re-fire. For example, with a heat load of 200,000 btuh and a lower system operating temperature of 125°F, re-firing is required every 9.2 hours.

WHS 3200

Emissions

Particulate emissions have not been tested on the WHS-3200.

Flue Specifications

The GARN WHS-3200 is available in a Vertical Exhaust configuration (WHS-3200V). The vertical configuration comes with a universal flue connection so any manufacturer’s insulated Class A 2100F rated flue with a 12 inch outer diameter and 10 inch inner diameter is acceptable.

Mechanical and Electrical Specifications

Hot Water Supply Connection………………………………………………..3” FPT

Hot Water Return Connection………………………………………..2-1/2” MPT

Makeup Air Requirement (at sea level)…………………………….975 CFM

Weight Empty………………………………………………………………………7,500 lbs

Weight Full…………………………………………………………………………34,500 lbs

Water Storage Volume……………………………………………….3,200 Gallons

Flue………………………………………………………………..10 inch, Class A 2100 °F

Maximum Flue Discharge Temperature……………………………….450 °F

Front and Back Heads………………………….3/8” grit-blasted mild steel

Tank and Other Parts………………………….1/4” grit blasted mild steel

Electrical requirements………………………………………….15 AMP, 120VAC

Water Treatment and Chemistry

Because the GARN WHS has a large thermal storage volume, the quality and chemical treatment of the water used is the most essential element to ensure the equipment’s longevity and efficient operation. A water treatment program is included with the purchase of a GARN WHS. The water treatment program includes the following at NO COST:

  1. The initial chemical required to test and treat the fill water.
  2. Routine (semi-annual) analysis of the tank water.

There are three main components to water treatment program:

  • Sample: using the included water bottle, sample the fill water (if initially filling the unit) or the water from the tank.
  • Test and Analyze: the sample is sent out for analysis. A report from the lab is returned which details the outcome of the lab analysis.
  • Treat: Based on results of the lab analysis add or maintain chemical as needed.

Fill water must be analyzed before the unit is initially filled and a water sample must also be taken twice per year (every 6 months). For more information, consult the GARN WHS 3200 Owner’s Manual.

Installation

Insulation

The GARN WHS must be insulated on site. Non-combustible materials must be used in the construction of the insulation enclosure. The following types of insulation may be used: Vermiculite or Perlite, dense-pack blown in non-binder fiberglass or rock wool, unfaced glass fiber batts, unfaced rock wool batts.

Clearance to Combustibles All GARN® WHS equipment must be placed in a sheltered, enclosed space (heated or unheated). Clearance to combustibles must be no less than 2” from the sides and back and 60” in front.

Warranty

The GARN WHS comes with a 5 year warranty. For specifics related to the warranty, consult the GARN WHS Owner’s Manual, available online at the GARN Website.

GARN WHS/ETS Off-Peak Electric Heating

Did you know that you can turn your GARN WHS into a complete electric heating system for less money than buying an electric boiler?  The GARN Unit’s thermal storage makes it an ideal piece of heating equipment to use your utility’s Off-Peak Electric Heating programs.  Take advantage of low-cost, discounted electric rates that cost less than heating with fuel oil or propane.

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