- Options and Accessories
- Specs / Manual
- Maintenance instructions
- Tech support
The Max Caddy is a smart furnace equipped with a control PC board (PCB) with integrated software. With the control PCB, the furnace automatically selects the most appropriate blower speed to keep the plenum at the right temperature for optimal efficiency. The Max Caddy works perfectly at any blower speed, producing even heat all throughout the combustion cycle. This exclusive feature not only delivers superior comfort, but also extends the furnace’s cycling intervals, which means significant savings on fuel.
Smarter and more efficient
With its built-in control PCB software, the Max Caddy boasts energy efficiency of 85% (LHV) and average emissions of 0.316 g/MJ. It was designed according to the latest CSA B415.1-10 standard and is certified by the EPA, whose emissions and efficiency testing methods for solid-fuel central heating systems are the most advanced anywhere. Say goodbye to your conventional wood furnace and start reaping the rewards of a furnace that’s smarter and more energy efficient, too!
One furnace, multiple energy sources
The Max Caddy is the first furnace in the world capable of running on wood, oil, and electricity so you can heat your home using multiple energy sources. It can be installed as a wood-only, wood+electric, wood+oil combo, or even wood+oil+electric triple combo furnace!
Sophisticated and versatile
The Max Caddy comes with a number of attractive options such as a hot water loop kit for domestic hot water, a fresh air intake adaptor, and a top cold air plenum kit. There’s no doubt about it—the Max Caddy is one of the most versatile and ingenious central heating systems on the market.
Alternate source of heat
With Caddy series furnaces, you’ll always have an alternate source of heat to ensure the comfort and safety of your family. The Max Caddy comes in four different configurations: wood-only, wood+electric combo, wood+oil combo, or wood+electric+oil triple combo.
This furnace can be installed as a wood-only unit. Blower box and fan limit kit required for this configuration.
Combined Wood + Electric
This furnace can be installed as a wood+electric combo unit to ensure your central heating keeps running even when you’re not there to add more firewood. Electric element (fan limit kit included) required for this configuration.
Combined Wood + Fuel Oil
This furnace can be installed as a wood+oil combo to ensure your central heating keeps running even when you’re not there to add more firewood. Oil burner unit and blocked vent switch required for this configuration.
Combined Wood + Fuel Oil + Electric
The first furnace in the world which can be installed as a wood+oil+electric trio combination for fuel flexibility. The addition of an electric element, oil unit and blocked vent switch is required for this configuration.
86% of the last 38 homeowners who have registered their warranty are satisfied with this product
In the short amount of time that we have been using the Max Caddy our wood consumption has dropped approximately 35-40 percent. I am very pleased with your product and the clear craftsmanship the unit displays.
In the short amount of time that we have been using the Max Caddy our wood consumption has dropped approximately 35-40 percent. I am very pleased with your product and the clear craftsmanship the unit displays.
Joseph – Skandia, USA
Options and Accessories
A - Wood
B - Combined Wood + Electric
C - Combined Wood + Fuel Oil
D - Combined Wood + Fuel Oil + Electric
Add the required components A, B and C for this option.
Find a complete line of accessories to help you get the maximum satisfaction from your heating appliance. For maintenance products, accessories, options or any other related products, SBI Heating Accessories is the ideal choice!
Find a complete range of venting products for different fuel type meeting all applicable standards in the industry and a huge variety of accessories allowing in a simple, effective, and safe way the installation of heating appliances. In addition, for each venting product category, you can get kits containing all the necessary parts to complete your project.
Specs / Manual
Appliance performance (1)
(1) Values are as measured per CSA B415.1-10, except for the recommended heating area, firebox volume, maximum burn time and maximum input capacity. Performances based on a fuel load prescribed by the standard at 10 lb/ft³ and with a moisture content between 18% and 28%.
|Fuel type||Dry cordwood|
|Recommended heating area (sq.ft.)||1,500 - 3,000|
|Firebox volume (cu. ft.)||4.9|
|Maximum burn time||15 - 17 h|
|Maximum input capacity (dry cordwood)||421,000 BTU|
|Overall heat output rate (min. to max.)||19,243 BTU/h|
|Overall heat output rate (max.)||67,069 BTU/h|
|Average overall efficiency (min. to max.)||78.90%|
|Average overall efficiency (min. to max.)||85%|
|Delivered heat output rate (min. to max.)||16,109 BTU/h|
|Delivered heat output rate (min. to max.)||54,578 BTU/h|
|Average delivered efficiency (min. to max.)||64.80%|
|Average delivered efficiency (min. to max.)||70.20%|
|Average particulate emissions rate||0.735 lb/mmBTU (0.316 g/MJ)|
|Average electrical power consumption||360 Wh|
|Maximum log length||25"|
|Flue outlet diameter||6"|
|Recommended connector pipe diameter||11 15/16" X 19 5/8" X 2 5/8"|
|Type of chimney||CAN/ULC S629, UL 103 HT (2100 °F)|
|Approved for a mobile home installation||No|
|Weight||729 lb (330 kg)|
|Door type||Single, glass with cast iron frame|
|Glass type||Ceramic glass|
|Glass surface – dimensions (Width X Height)||14 1/2" X 10 1/8"|
|Blower (hp / speed / CFM)||1/2 / 4 / 2,100|
|Filter – dimensions (Width X Height X Depth)||16" X 20" X 1"|
|Overall dimension (Height)||50 1/2"|
|Overall dimension (Width)||30 7/8"|
|Overall dimension (Depth)||41 1/8"|
|Door opening – dimension (Height)||9 7/8"|
|Door opening - dimension (Width)||15 3/4"|
|Firebox – dimension (Height)||15 7/8"|
|Firebox – dimension (Width)||20 3/8"|
|Firebox – dimension (Depth)||26 1/4"|
|Steel thickness – body||3/16"|
|Steel thickness – top||1/4"|
|Centre line of flue outlet to the side||15 3/8"|
|Centre line of flue outlet to the floor||45 5/8"|
|Air return plenum – dimension (Depth or Height)||17 15/16"|
|Air return plenum – dimension (Width)||19 15/16"|
|Hot air plenum – dimension (Depth or Height)||32 1/8"|
|Hot air plenum – dimension (Width)||25 3/8"|
|Burner – standard||Beckett - AFG|
|Burner – other brand approved||Riello|
|Burner – location||Right or left|
|Burner – recommended clearance for maintenance||24"|
|Burner – efficiency at input #1||85% (Beckett)|
|Burner – efficiency at input #2||83% (Beckett)|
|Burner – recommended connector pipe diameter (Wood-oil)||7"|
|Burner – recommended exhaust pipe diameter||5"|
|Burner – location of exhaust pipe||Right or left|
|Burner – capacity at input #1||91,000 BTU|
|Burner – capacity at input #2||120,000 BTU|
|Burner – orifice at input #1||0,65 70° W (Beckett)|
|Burner – orifice at input #2||0,65 70° W (Beckett)|
|Burner – pump pressure at input #1||100 psi (Beckett)|
|Burner – pump pressure at input #2||175 psi (Beckett)|
|Electric element – location||Right or left|
|Electric element – recommended (maximum output)||20 kW|
|Electric element – other optional (maximum output)||25 kW|
|Water loop kit – connection location||Right or left|
|Water loop kit – connecting pipe diameter||3/4"|
|Water loop kit – back-up tank volume||60 gal (227 L)|
|USA standard (emissions)||EPA (CSA B415.1-10)|
|Canadian Standard (emissions)||CSA B415.1-10|
|USA standard (safety)||UL 1995, UL 727, UL 391.|
|Canadian standard (safety)||CAN/CSA B366.1, CAN/CSA C22.2 no 236, CSA B140.4.|
|Tested and listed as per applicable standards||By an accredited laboratory (CAN/USA)|
Minimum clearances to combustibles *
(Data expressed in inches. 1 inch = 25.4 mm)
|Clearance – back wall||24"|
|Clearance – side wall||6"||6"|
|Clearance – opposite side wall||24"||24"|
|Clearance – recommended for maintenance on option side||24"||24"|
|Clearance – ducts||<6'=6" ; >6'=1"||<6'=6" ; >6'=1"|
* The information given on the certification label affixed to the appliance always overrides the information published in any other media (owner's manual, catalogues, flyers, magazines and/or web sites).
** Measured from the platform on which the product is installed. Some appliances have been tested with a low ceiling. If necessary, consult the owner's manual for information on these clearances to combustible materials.
How do I reduce the amount of charcoal my heater produces?
Appliances that are EPA or CSAB415.1 certified tend to create larger coal beds due to their higher efficiency. This can be controlled by the way you burn your appliance. After an overnight burn, you may have a more significant coal bed. Simply rake the coal bed forward and add a smaller piece of wood on top. Burn the appliance on a higher setting (air control fully open). This will pull more primary air into the firebox and will increase draft. The coal bed will burn down with the log. You may have to repeat this operation a couple of times before the coals are reduced. You are then ready to load your appliance with a larger fuel load.
Do I need an EPA certified or CSAB415.1-10 certified heater?
You first have to identify what your needs are. If you are looking for ambiance, a temporary heat source in a cottage or a camp, or a simple back-up heat source in case of power failure, you do not necessarily need to invest more money in order to buy an EPA or CSAB415.1-10 certified wood heater. However, if your goal is to heat on a regular basis, the extra dollars will prove to be a good investment. Furthermore, it must be noted that certified heaters release up to 90% less particles into the atmosphere, which makes wood a renewable and clean source of heat. As a result, if the style and size of the heater you are looking for is available in a certified version, it is highly recommended that you invest in this advanced combustion technology. You will help the environment and reduce your wood consumption by up to 30%.
NOTE: If you live in the United Sates, British Columbia, Ontario, Quebec, Nova Scotia, New Brunswick or Newfoundland, EPA certified wood heaters are mandatory. Exceptions apply for certain categories of products, such as decorative fireplaces. Certain municipalities may also have by-laws that require the installation of an EPA or CSAB415.1-10 wood heater, even though the province does not have an official regulation on wood heating. It must also be noted that in Canada, the CSAB415.1-10 Standard is equivalent to the EPA Standard. A wood heater that meets this Standard will generally comply with the regulation in place.
Why is the efficiency as per the EPA’s test data smaller than the publicized optimum efficiency?
EPA refers to the CSAB415.1-10 standard for the calculation of the appliance’s efficiency. The efficiency reported as per EPA’s directives consists of an average between four different burn rates, ranging from the lowest burn rate (air intake completely closed) to the highest burn rate (air intake completely open). The optimum efficiency that we publicize is the efficiency obtained according to the same test data, but for the low burn rate only. This efficiency is more realistic for a majority of users whose heating needs require that the unit be used to maximize burn times.
Why is the BTU according to EPA test data smaller than the one advertised?
You will notice a difference between the BTU output as per the EPA’s test data and what is advertised on our web site and/or product literature. The maximum BTU output we advertise is what will be obtained with a full load of seasoned cordwood inserted inside the firebox. The EPA output, on the other hand, is what has been obtained during emissions testing. The EPA test procedure requires that a special type of wood is used and positioned inside the firebox in a manner that does not represent the way the firebox volume would normally be utilized using seasoned cordwood. The EPA test load is typically much smaller. Hence, the BTU as per the EPA’s test data is reduced. The BTU output that should be considered by a normal user is the one we advertise for seasoned cordwood.
Can I install an EPA or CSAB415.1-10 certified heater on an 8-inch chimney?
EPA or CSAB415.1-10 certified heaters function best on a 6-inch chimney (interior diameter). The problem with an 8-inch chimney is that the appliance may struggle to heat-up the air volume contained inside the chimney. A hot chimney is required to create enough draft. Poor draft will inevitably lead to poor combustion, which will cause smoke roll backs, a dirty glass, lack of heat, and a large quantity of unburned fuel inside the firebox. It is therefore highly recommended installing a 6-inch liner inside the 8-inch chimney. This liner may be rigid or flexible.
Is it recommended to keep the wood furnace's blower running continuously during winter in order to maintain a more even temperature throughout the house?
Indeed, installers often recommend this practice for oil, gas or electric central heating systems. However, it is definitely not recommended for a solid fuel fired furnace.
The heat generated by the wood furnace differs from other combustibles. As the wood load burns, the temperature varies lots based on the different stages of combustion. The temperature of the combustion gases must remain above the condensation point at all times in order to avoid the formation of creosote. The fan limit control will turn the blower off before the gases’ temperature drops under the condensation point.
In the case of a high efficiency furnace, stopping the blower will also help in keeping the firebox temperatures high enough for secondary combustion to take place. This is essential if you wish to have a clean burn and maximize the appliance’s efficiency.
Where on the hot air plenum of my wood furnace can I install the fan limit control?
The cold air forced through the furnace by the blower circulates around the firebox and is deflected towards the heat exchangers in order to transfer as much heat as possible. The hot air will then be distributed throughout the house.
The temperature inside the plenum will vary a lot from one spot to the other when the blower is running. The fan limit settings are determined in our factory such that the blower turns on when the temperature is sufficient to obtain the best heating efficiency and to turn off before the combustion gases cool down to the point where they could condense.
The proper position of the fan limit control is mentioned in all our manuals. The position of the fan limit control is of prime importance to insure the proper performance of the furnace.
Can I use my wood furnace during a power failure?
A wood furnace can be used in the case of a power failure without risking damaging the unit. The conception of the wood furnace is very similar to that of a wood stove. It is tested to withstand the intense heat of a wood fire, even if the distribution blower is not functioning due to the absence of electric current. The furnace’s efficiency will however be greatly reduced. Hot air will rise by gravity into the ductwork, but it will not be pushed into the rooms in an effective manner. In most installations, hot air circulating by gravity into the ductwork will be sufficient to keep the house warm enough to live in.
Should we install a barometric damper (draft regulator) on the exhaust pipe of a wood furnace?
In the case of older, conventional furnaces, the flame can easily reach the heat exchangers. When the installation or draft adjustment is inadequate, this tends to favor creosote build-up, which can be set on fire. Therefore, we recommend the installation of a barometric damper on this type of wood furnace.
For high efficiency furnaces (Mini-Caddy, Caddy, Max Caddy), the secondary combustion ensures that creosote is usually not a problem. The configuration of the firebox is such that the flame cannot travel to the heat exchangers. We do not supply any barometric damper with the furnaces for these reasons. However, a barometric damper is recommended in the case of excessive draft. Excessive draft occurs when combustion cannot be slowed down by closing the primary air inlet.
What will happen if there is a power outage and my wood furnace is in the middle of a combustion cycle?
A wood furnace can be used temporarily without electricity, taking into account the following guidelines:
Why does the electric unit overheat and trigger the manual reset thermodisc.
- The air filters are clogged or very dirty.
- The blower does not start (the first sequencer does not close or the motor is defective).
- The cold air return volume is not sufficient.
- There is excessive static pressure (the distribution duct is too small or there are not enough outlets).
- The heat sensor is defective (rare).
- The insulation between the cold air return cabinet and the air distribution cabinet is cut too short and restricts or diverts the air flow at the exit of the electric element, thus creating artificial overheat (rare).
Why can’t my Max Caddy heat my house when my old 150,000 BTU oil furnace could do it without any problem?
An oil-fired furnace will reach its maximum heat output within minutes of start-up and keep that pace as long as there is a call for heat. A wood furnace will generate its maximum heat output only at the peak of the combustion cycle. Before that, it needs to build a momentum. Then, the heat output will slowly diminish as the wood load gets consumed.
The performance of the wood furnace will also be affected by the quality of the combustible, which is not as constant and predictable as heating oil. It will vary a lot depending on the density and moisture content. Numerous other factors may also affect the performance of the furnace, such as a poor chimney draft, dirty heat exchangers, low static pressure, etc.
Can the Caddy add-on be installed with an existing propane or natural gas furnace?
The certification allows the installation with the two types of gas. Therefore, the Caddy add-on may be hooked-up with either a propane or natural gas furnace, provided that the gas unit’s output power does not exceed 35.17 kW (120,000 BTU/h).
Is it possible to reduce the fan speed of my PSG furnace to reduce the noise level?
Except for the Max Caddy and the Caddy Alterna, the blower motor on your furnace has four speeds and the installer will have to select two, that is one speed for continuous air circulation during the summer months (low) and one speed for heating. The latter will be selected in accordance with the ducts design and the air distribution needs (normally med-low or med-high).
Electrically speaking, the circulation and heating speeds may be the same if you connect both the black and red wires on the same terminal. You should however take note that reducing the heating speed will reduce the heat exchange and the furnace’s temperature will increase accordingly, which could cause the furnace to overheat.
Should you choose to reduce the blower speed, be certain that the primary air intake damper closes completely when the thermostat is not calling for heat so that in the case of an overheat, the damper motor being deactivated, the furnace will go into slow combustion and the blower will be capable of cooling it down.
Less air flow through the electric unit of a wood/electric combination furnace could also increase the risk that the overheat protection on the unit will trip. This is especially true if the air filter is dirty. This situation will leave you with no electric heat until the sensor is manually reset.
How do I determine what furnace I need between the Mini-Caddy, Caddy and Max Caddy?
We have a “rule of thumb” that is not scientific, but that can give you a good idea on what PSG product you need to install in your house.
We assume that the house has an average insulation, quality windows and doors and 8 foot ceilings, with a location in an area where winter temperatures are comparable to most Canadian areas. We do not count the basement. Start by calculating the area of the main floor and add 50% of the area of a second floor when applicable. If you do not exceed 1,000 square feet, the Mini-Caddy is adequate. Up to 1,700 square feet, a Caddy installed and operated as recommended should satisfy your heating needs. Above 1,700 square feet and up to 3,000 sq. feet, the Max Caddy should be used.
Of course, nothing can replace a heat loss calculation conducted by a forced air heating professional to determine your exact heating needs and verify your existing ducting for compatibility.
Can I add an air conditioning unit to my PSG wood-heating system?
My furnace is a wood electric combo. Is it possible to burn wood and run the fan with a generator in case of a power failure?
First, please note that your PSG furnace, if installed in accordance with the clearances, may be operated without the blower during a power outage, if authorized and mentioned in the manual. In such a case, it is recommended to open the blower access panel to help circulate hot air in the ducts by gravity. You also need to heat moderately. Note that the air intake damper motor will not work without power. It will need to be operated manually. It is possible to feed the blower with a generator, but you must make sure that the power from the house’s electrical panel is cut off to prevent conflict when the power is restored. This can be done automatically with the use of a suitable relay.