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.
The “Hardy” can extend your swimming season by heating your swimming pool with a manual adjustable heat plate exchanger.
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
The Hardy, First on the Market, Best in the Field.
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 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.
“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
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
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.