Outdoor wood boiler hook up

This page completely details how to install your Nature's Comfort outdoor boiler. Wood furnace installation should always be this easy!.
Table of contents

The heat exchanger must be installed so that it is airtight. No air must be able to flow around it or out of the ductwork.

Installation - Polar Furnace

Use adhesive backed foam tape used for insulating doors and windows around the water coil. Use foil tape to seal off the heat exchanger and the hole you make, or consult a local HVAC installer or technician. Ideally, there should be no splices in any water lines! The IN fitting should be at the bottom of the lowest point bottom.

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You should be able to find a heat exchanger to fit most popular sizes of plenums. In all cases, wear protective gear, gloves and glasses and a mask. Measure the width of the heat exchanger Dimension A in next diagram. Measure the thickness of the heat exchanger Dimension C. Start by cutting a hole in the side of your ductwork the thickness of the heat exchanger Dimension C and the full length of the ductwork usually Dimension A.

Metal edges are very sharp! Where protective gloves and use caution!

ADDITIONAL RESOURCES

Slide the heat exchanger into the hole for a test fit. Ideally the tubes D and E should stick out of the plenum [see diagram on previous page]. The header and tubes F can stick out of the plenum as well, if necessary. As long as the whole coil surface B is in the plenum, you should be good even if a little more of the header F and even G sticks out. While test fitting it, try to determine how much tape is needed around it.

A different amount thickness may be needed on different sides. You can purchase different thickness of foam tape, so that it will fit and seal properly. This is what the braces will look like.

If you have any installation questions at all, please call Randy at (608) 399-4847!

Rivet or screw into place. Install the braces as shown above. Simply put them in place, the proper width apart Dimension C.

You will need four pieces, two each on the top and bottom. Slide the heat exchanger carefully into the plenum to check the fit again. If all looks good, you can seal off the ends of the heat exchanger and the hole you made in the plenum with foil tape made for ductwork. Input lines should be at the bottom, unless otherwise marked.

You can install a heat exchanger in a plenum that is smaller than the length of the heat exchanger. This is a good ideal because you will get the whole core inside the ductwork. Only the frame will stick out 1" on each side. Cut the lines at the top and bottom of the plenum, usually 4 inches long the width of the heat exchanger. Cut another line vertically, between the other two cuts, right in the middle as shown.

Slide the heat exchanger through the front hole to the back hole.

Install an Outdoor Wood Stove

So that it protrudes front and back. Ideally the core of the heat exchanger will be entirely within the plenum. This becomes more important as the indoor system becomes larger and more complex. In this situation the pump on the load side of the heat exchanger or the fan in the central air furnace can be switched on and off by a room thermostat. This drawing shows the simplest way to connect an outdoor wood furnace to central air as well as the domestic hot water tank.


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This drawing shows a closed system in which a diverter valve supplies hot water to the central air furnace radiator only when there is a demand for heat from the room thermostat. More precise and more stable temperature control inside building. Central air fan never shuts off and continuously circulates air in building creating more constant temperatures inside the building heated. For a more complex system like this Polar Furnace strongly recommends a heat exchanger between the outdoor wood furnace and indoor system.

Also when distributing to heat emitters higher than the water level in the furnace a heat exchanger is also strongly recommended to minimize the occurance of air traps in the system. Hydronics for wood fired heating systems.


  • How to Install an Outdoor Furnace.
  • INSTALLATION DRAWINGS!
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  • Installing a Nature's Comfort Outdoor Wood Furnace.

    • Closed Indoor system - Heat Exchanger Detailing This drawing details the components required to create a closed system indoors. Central Air - Closed Indoor System This drawing shows how to hook up to central air only with a closed system.