Hardy Body

The Hardy’s design is to give years of dependable service with little maintenance.

The Hardy Outside Woodburning Heater is designed to be located next to your firewood storage for convenient loading, normally twice a day. This removes the fire danger from your home and keeps wood trash, smoke and ashes out of your home. The Hardy Heater does not require special equipment to transport or relocate.  The heater firebox is constructed of 14 and 16 gauge 304 stainless steel for the best heat transfer possible. The heat transfer efficiency is three times better with 16 gauge 304 stainless steel than with 3/8" carbon steel. The all stainless steel firebox also resists rusting and burnout that occur in standard carbon steel. The stainless steel smoke stack that passes through the water chamber resisting burnout and corrosion. The insulated all stainless steel firebox door and ash door hold the heat in and resist burnout and corrosion. The firebox comes standard with thick, heavy cast iron grates to make weekly ash removal simple and fast.  The use of chemicals inside the water tank is not necessary because of the corrosion resistance of 304 stainless steel. Since hot water evaporates, Hardy invented a condenser stack located on the rear of the furnace that condenses the steam and returns it to the water tank. The water tank is vented to the atmosphere to eliminate the safety hazards common with a pressurized boiler. Standard features on Hardy heaters are an adjustable aquastat, combustion blower for damper control, 4GPM at 20 feet of head circulator pump with an on/off control relay, and automatic water level controls. The Standard Hardy also comes equipped with a heat exchanger to provide hot water for your domestic use. The Hardy provides hot water for hot air duct systems, water baseboard, radiant floor heat, unit heaters and other existing hydronic systems. The Outside cover is constructed of 24 and 26 gauge 304 stainless steel to give you years of maintenance free service. The stainless steel cover will not fade, needs no painting and does not require any weather protection.

How Does A Hardy Hydronic Heater Work?

All Hardy units have a 304 stainless steel firebox.  The different types of fuel are placed here, which may include cordwood, pellets, or coal depending on the specific model.  The firebox is surrounded by water.  As the fuel burns, the heat or energy is transferred through the firebox metal to the water in the surrounding water jacket.  A typical Hardy contains approximately 100 gallons of water.  The amount of water in the water jacket is different depending on the unit size.  Hardy Heaters store less water than most of its competitors.  That along with our stainless steel firebox allows The Hardy greater heat transfer and quicker water heat recovery.  An aquastat constantly monitors The Hardy’s water temperature and as it begins to lower the aquastat will power up the combustion blower and damper solenoid.  The forced air re-ignites the fire forcing the water temperature to rise.  At approximately 180˚ the aquastat powers down the combustion blower and damper solenoid.  This process seals the firebox while basically starving the fire and forcing it to smolder and die down to coals.  This process repeats itself as needed to keep The Hardy at a controlled temperature, with no intervention on the homeowner’s part.  Most Hardy’s have a 12 hour burn time per load.  Although, each installation is unique you may experience more or less burn time.

How Does The Hot Water Produced By The Hardy Heat My Home And Domestic Water?

The Hardy is designed to be installed 10’ to 100’ from the structure you plan to heat.  A concrete pad is poured for The Hardy to be installed on.  Hot water is circulated through underground pex pipes to your home or shop.  The installation of your buried pipes is a very important step in the installation of your Hardy.  The ditch needs to be below your local frost line.  An insulated, water tight chase pipe needs to surround your circulating Hardy pex pipes.  This is one of the most crucial steps of the installation process.  If done incorrectly, heat loss during transport from The Hardy to your home or shop will increase and cause more fuel consumption.  Once the transport of hot water arrives at your home or shop, a water to air heat exchanger coil or a water to water heat plate exchanger is used to heat your home or domestic hot water

Typical Hardy Hook-Up Techniques

 Since 1976 we’ve been heating homes domestic water, and shops just like yours.

The development of the first Hardy Heater put the company at the forefront and made them pioneers in an entirely new field of heating. With the knowledge and the experience gained over the years in developing water-based outside woodburning heaters, Hardy stays ahead of the competition by offering the best products and services on the market. All stainless steel construction, quality workmanship, Underwriters Laboratory Listed, 25 year limited warranty, 6 independent distributors, a 500 + member nationwide dealer network ready to assist customers, a product built to last and over 35 years of outside woodburning experience are the qualities that make the Hardy the best outside woodburning heater on the market. Our pledge is to provide the latest technology, quality products, and a genuine commitment to customer service. Customer satisfaction starts with your local dealer, supported and assisted by the distributor and backed up by Hardy Manufacturing


“Hardy” Fan Coil Unit
Homes without existing ductwork can   enjoy   the   advantages   of “Hardy” heat with “Hardy” Fan Coil  Unit,  HFCU.  The  HFCU  is an  attractive  finished  furniture cabinet  containing  a  hot  water coil  and  fan.  Water  is  circulated from  the  “Hardy”  heater  to  the
HFCU  which  is  located  inside your  home.  The  fan  inside  the HFCU  forces  hot  air  across  the water coil and heats your home, while a thermostat mounted on an electrical  outlet  adjacent  to  your HFCU regulates the temperature.



Swimming Pools
The “Hardy” can extend your swimming season by heating your swimming pool with a manual adjustable heat plate exchanger.


Forced Air System

Forced Air System
A   hot   water   heating   coil   is installed  in  the  supply  side  of your new or existing air handler and    ductwork.   A    new    wall thermostat regulates the “Hardy” heater,   while   performing   the following  two  functions.  First, the  thermostat  senses  the  need for  heat  and  turns  on  the  waterpump   to   circulate   the   water.  Second,  the  thermostat  turns  on the  blower  inside  your  central unit  to  force  air  across  the  coil and  through  your  central  duct system, thereby filling your home with  the  warm  heat  from  your “Hardy”  heater.    Your  existing system  can  serve  as  a  back-up heating source.


The Hardy, First on the Market, Best in the Field.

Direct Baseboard

Hydronic Heater System
The  “Hardy”  heater  can  be  connected  directly  to  a  new  or  existing  boiler  heating system where the heater circulating pump will supply the flow of hot water. The heat will be transferred throughout your home with the existing pump, zone values, and baseboard radiation. The “Hardy” can be connected to any existing hydronic heating system that operates at 180 degrees Fahrenheit or less, pressurized or non-pressurized. Your existing system can serve as a back-up heating source.


Radiant Floor

Radiant Floor Heating
The   “Hardy” heater  can   supply   the necessary  hot    water    to    provide    heating    comfort  for your  hydronic  radiant  floor  system.  The  water circulates from the “Hardy” heater through tubing inside concrete or wood floor construction.  With the  “Hardy”  hookup,  the  system  temperature  can    be   controlled    on    a    room-by-room  basis. Energy  is  spent  only    when  and  where  needed.  Strategically placed  thermostats  recognize  the  deviation  in  temperature  and  react promptly  with  efficient  and  economical heat. Thermostats in    areas    of    the    house    not    in    use    can    be  lowered  to  conserve energy.


Coil Placement

“Hardy” Coil Placement
The “Hardy” coil can be placed in the supply  duct  of  any  air  handler  (gas, electric  or  heat  pump),  and  will  add little or no static pressure to the system.


Domestic Water Heater

Domestic Water Heater
A    heat    exchanger    connects    the domestic water line to your “Hardy” heater to provide all your household hot    water    needs.    The    “Hardy” provides  hot  water  for  your  bath, shower,  kitchen,  and  laundry  from hot  water  stored  in  the  domestic water heater.

By opening a hot water faucet inside your home, the water pressure on the supply line will force water through the  heat  exchanger.    As  this  water passes  through  the  heat  exchanger it is heated and then enters the cold water input on your hot water heater. This   preheats   your   domestic   hot water, increases  the  amount  of  hot water available for use, and reduces your hot water heating cost.


Dairies & Shops

Dairies & Shops
The “Hardy” provides hot water for your dairy and shop from hot water stored in your domestic water heater.  Your shop can be heated by connecting the “Hardy”  heater  to  hydronic  or  forced  air  systems. The  “Hardy “ Commercial Fan Coil Unit is available for use in dairies or shops without existing hydronic or forced air systems.


Heater Group Pics
H4, H2, & H25
Hardy Swimming Pool Hookup
Hardy Fan Coil Unit
Hardy Forced Air & Water Heater Hook-up
Hardy Hydronic Heater System
Hardy Radiant Floor Hook-up
Hardy Water To Air Heating Coil
Hardy Domestic Water Hook-up
Hardy Dairies & Shops

© Copyright Hardy Manufacturing Company, Inc. * 1-800-5-Hardy-5 * Phone: 601-656-5866 * Fax: 601-656-4559

Burn Wise
Proudly Made in USA
25 Year Warranty
Green, Renewable, Carbon Neutral
25 Year Limited Warranty
The Hardy, Green & Clean


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