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Central Boiler Outdoor Furnaces: FAQs
Over the years we have kept a record of common questions asked by Central Boiler owners and potential owners. Our database contains these questions, which are available for you to browse.

How complicated is the installation?
Installing your Central Boiler outdoor furnace is easier than you might think. Many customers choose to install their own furnace because the installation can be easily completed using the installation manual. Authorized Central Boiler dealers have all the supplies and accessories you need for installation and maintenance. All of our dealers can provide you with information regarding your installation, and some dealers can even handle the entire installation for you.

How do the dimensions compare between models?


Where can I get technical support for my furnace?
The best way is through your local dealer (using our Dealer Locator page). If you are having difficulty reaching your local dealer, feel free to call the Central Boiler manufacturing plant toll free during normal business hours Monday - Friday at: 1-800-248-4681.

How do I perform an above ground (winter) installation?
Use the ThermoPEX® System and a temporary raised base (shown above). Quick and easy, temporary, above ground installation any time of year, giving you time to decide the best possible location for your furnace, without having to worry about frozen ground conditions or snow cover. The ThermoPEX® System is an all inclusive package with return and supply lines, insulation, and a protective waterproof (and temporarily weatherproof) jacket all in one pipe, and may be buried underground in the spring or summer when it's convenient for you.

If ThermoPEX is installed temporarily above ground, provisions should be made to prevent possible risk of fire coming into contact with the ThermoPEX. ThermoPEX is constructed of materials that can burn and transfer a fire. Do not cover the ThermoPEX with combustible materials like straw, hay or leaves.

Who is Central Boiler?
Central Boiler is the leading manufacturer of outdoor furnaces in Northern America. Founded in 1984 and based in Greenbush, Minnesota where the winter temperatures can drop to 59 degrees below zero, we know the value of safe, efficient heat.

What is a Central Boiler outdoor furnace?
It is a safe and efficient way to heat your home. The Central Boiler outdoor furnace is designed to look like an attractive storage building and is installed outside, away from the home or building being heated. A water jacket surrounds the furnace firebox and the heat is transferred from the wood fire to the water.

How can a Central Boiler outdoor furnace heat my building(s) and water?
A water jacket surrounds the furnace firebox and heat exchanger, and heated water is circulated to the home or building through insulated underground pipes -- an efficient way to move heat over distances. A Central Boiler outdoor furnace is designed to work with any existing heating system. Water-to-air or water-to-water heat exchangers or direct circulation conveys the heat into the structure's forced-air furnace, boiler or radiant floor heating system. This allows you normal thermostatic control. Central Boiler outdoor furnaces can provide heat for all your domestic hot water by adding a water-to-water heat exchanger, and you can save even more per month! Central Boiler outdoor furnaces also have the ability to heat multiple buildings, such as a garage, workshop, shed, greenhouse, or barn. It can even be used to heat a swimming pool or hot tub.

What are the advantages of a Central Boiler outdoor furnace?
The Central Boiler outdoor wood furnace removes fire hazards from your home or building because all of the burning takes place outside. An outdoor wood furnace won't affect your indoor air quality and can alleviate respiratory and allergy problems caused by indoor wood burning. Did you know that current Central Boiler outdoor furnace owners are using from 25 to 50% less wood compared to other wood heating alternatives? Since Central Boiler outdoor wood furnaces can burn larger pieces of wood they can dramatically reduce the time you spend preparing wood. Thermostatic control provides your home with even, steady heat.

Is wood burning bad for the environment?
A wood heating system is the right choice for the increasing number of consumers who are concerned about our environment. Wood is a totally renewable resource, which, when burned, results in no net carbon dioxide increase and can help reduce your carbon footprint. On the other hand, fossil fuels, when burned, release carbon dioxide which otherwise would stay trapped in the earth. The burning of fossil fuels causes a net increase in carbon dioxide, which is believed to be responsible for the heat-trapping greenhouse effect. When heating with wood rather than fossil fuels, you actually achieve a net reduction in greenhouse gas emissions. In addition, harvesting firewood has a pruning effect on forests, which allows new growth to flourish. The wood you burn likely comes from your local area -- it's not imported and not subject to price increases due to events outside your control, as is the case with oil.

How long will the furnace last?
The life of your furnace depends upon proper maintenance. With proper maintenance your furnace will give you many years of dependable service.

How long is the warranty?
An optional 25 year limited warranty is available on outdoor wood furnaces that are registered at the time of purchase (includes a corrosion coverage). Central Boiler leads the industry with its commitment to stand behind its outdoor wood furnaces. 25 year warranty not available on Pallet Burner model.

What can I expect to pay for a Central Boiler outdoor wood furnace?
Prices will vary depending on shipping and options, but our base models start at $5,490. Click here to apply for financing now.

Is this furnace (boiler) pressurized or non-pressurized?
The Central Boiler outdoor wood furnaces are non-pressurized. Technically they are atmospheric vented, which means they are safe.

Is there a lot of heat loss when the unit is outside and it's below 30 F?
The units are highly insulated with air tight waterproof urethane insulation, the same insulation used on high efficiency water heaters.

Can I connect a Central Boiler outdoor furnace to a forced air heating system?
Yes, more than 65% of all installations are connected to existing forced air heating systems.

I only have baseboard electric heat. How can I use a Central Boiler outdoor furnace?
Many people with electric baseboards elect to install radiant floor heat between the floor joists. Consult your dealer for other hydronic and space heating options.

Can I heat my domestic water with a Central Boiler outdoor furnace?
Yes, with the use of a domestic water heating kit that uses a water-to-water heat exchanger. You can turn off your hot water heater and save even more money per month!

Can I connect a Central Boiler outdoor furnace to a pressurized heating system?
Yes, in one of two ways: By connecting it directly to the existing system and depressurizing it or by the use of a water-to-water heat exchanger the heat can be transferred from one system to the other.

Should I consider radiant heat?
Radiant heat installed under new or existing floors can be a great way to heat your home. Radiant floor heat an efficient way to transfer heat. However, it is important that you design the system correctly.

Can a Central Boiler outdoor furnace heat my pool and/or hot tub?
Yes, many Central Boiler customers heat their pool and/or hot tub.

Can I heat more than one building?
One of the many advantages of the Central Boiler outdoor furnace is the ability to heat multiple buildings from one location.

Can I use an outdoor wood furnace if I live in town?
Wood may not be the best fuel choice in densely populated urban areas where automobile exhaust and other pollution already puts excessive strains on the air shed. But in suburban, small town, and rural areas, an outdoor furnace makes good sense. If you choose to install your furnace in a densely populated area the stack height should exceed the rooflines of existing homes.

Does the furnace come fully assembled?
Yes. Like most major appliances the unit only requires installation.

Can boilers explode?
Central Boiler outdoor furnaces are non-pressurized systems which eliminate this possibility.

Do I have a choice of colors?
Central Boiler outdoor wood furnaces are available in many different color combinations, one that's sure to compliment the exterior of your home. Currently available colors can be seen in the Products section under the E-Classic or Classic models pages. The Classic CL 7260 and Pallet Burner are only available in charcoal.



A safe, efficient outdoor wood furnace that can provide 100% of your heating needs. Central Boiler manufactures and distributes the Classic and E-Classic outdoor wood furnaces, these outdoor wood-fired hydronic heaters can heat multiple buildings, hot tubs, pools, greenhouses, domestic water and more.

While burning a wood stove indoors can mean many problems, there is an alternative...a Central Boiler outdoor wood furnace. Also known as an outdoor wood boiler, outdoor wood gasification furnace, or outdoor hydronic heater, an outdoor wood furnace eliminates the problems associated with indoor burning and allows you to get even more benefits from wood heat. Central Boiler outdoor wood furnaces can actually improve the indoor environment in your home or business, while eliminating the time-consuming chore of tending a traditional wood stove.