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Osburn Horizon Wood Fireplace

Item #: OB04010

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$6,699.00

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Product price: $6,699.00
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Product Description

Load it at bedtime, still have coals in the morning

Most wood fireplaces are an evening's entertainment. The Horizon is sized to actually heat a house: a 4.28 cubic foot firebox that swallows 60 lbs of cordwood and holds a fire for up to 11 hours. That number is the whole argument for this unit. It is the difference between reloading at 2am and waking up to a bed of coals you can bring back with a couple of splits.

The trade-off is size. At 50¾" wide and 31¾" deep this is a substantial appliance and it needs a framed opening to match. If you want the burn time, you have to give it the room.

Clean-burning without a catalyst

The Horizon is non-catalytic and still meets EPA standards at 1.6 g/h of particulate emissions. That matters practically, not just environmentally: a catalytic stove has a combustor that degrades and eventually needs replacing, typically every few years and at real cost. A non-catalytic unit achieves clean burn through firebox geometry and air control instead — nothing to replace, and less that can go wrong when it is running hard in February.

Cleaner combustion also means less creosote in your flue. As a chimney company we will say the quiet part out loud: the difference between a well-run modern fireplace and an old smoky one shows up directly in how much we sweep out of the liner each year.

What it needs from your chimney

This is where wood-burning installs go wrong, so read it before you buy:

  • 8" flue diameter — the appliance will not draw properly on a smaller liner
  • Minimum 15 ft of chimney height — short stacks do not develop enough draft
  • Class A chimney to CAN/ULC S629 or UL 103 HT (2100 °F) — standard-temperature pipe is not acceptable

If you are putting this into an existing masonry chimney, the flue almost certainly needs relining to 8". That is work we do, and it is better priced into the project now than discovered afterwards.

Specifications

  • Firebox: 4.28 cu ft — 25⅝"W x 17⅞"D x 17"H
  • Overall: 50¾"W x 31¾"D x 43⅚"H
  • Door opening: 33"W x 12¾"H, double glass with cast iron frame
  • Burn time: up to 11 hours · wood capacity 60 lbs
  • Emissions: 1.6 g/h particulate · 159.0 g/h CO · EPA approved
  • Non-catalytic combustion, C-Cast or equivalent baffle
  • Fuel: dry cordwood, 16" lengths recommended

Sizing a wood fireplace to a house is not guesswork, and neither is the chimney it needs. Tell us the square footage you are heating and what is currently in the chase — (540) 212-9374.

Specifications

Type of Chimney: CAN/ULC S629, UL 103 HT (2100 °F)
Minimum Chimney Height: 15'
Fuel Type: Dry cordwood (16" recommended)
Door Style: Double, glass with cast iron frame
Door Opening Height: 12 3/4"
Door Opening Width: 33"
EPA Approved: Yes
EPA Loading Volume: 4.28
Average Particulate Emissions Rate: 1.6 g/h
Average CO: 159.0 g/h
Combustion Technology: Non-catalytic
Baffle Type: C-Cast or equivalent
Overall Width: 50 3/4"
Overall Depth: 31 3/4"
Overall Height: 43 3/8"
Firebox Width: 25 3/8"
Firebox Depth: 17 7/8"
Firebox Height: 17"
Firebox Volume: 4.28
Chimney Diameter: 8"
Flue Outlet Diameter: 8"
Heating Sq Ft: 1,000 - 2,800
Maximum Burn Time: 11h
Overall Heat Output Rate: 16,900 BTU/h (5.0 kW) to 43,000 BTU/h (12.6 kW)
Maximum Heat Output: 95,000 BTU/h (27.8 kW)
Efficiency: 64%
Optimum Overall Efficiency: 70%
Optimum Heat Transfer Efficiency: 69%
Maximum Log Length: 25"
Glass Viewing Area: 29 3/4" X 13 1/2"
Blower Included: Yes
Blower CFM: 176
Glass Color: Ceramic glass
Item Weight: 560 lb (254 kg)
Approved for a Mobile Home Installation: No

Minimum Clearances to Combustibles

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). Some appliances have been tested with a low ceiling. Before setting up your unit, refer to the installation manual.
Data expressed in inches. 1 inch = 25.4 mm (Single Wall Pipe / Double Wall Pipe) Single Wall Pipe Double Wall Pipe
Clearance - Side Wall 24" –
Clearance - Top (Measured From the Platform on Which the Appliance Is Installed) 84" –

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FAQs

Q: Why is the efficiency as per the EPA’s test data smaller than the publicized optimum efficiency?

A: 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.

Q: Why is the BTU according to EPA test data smaller than the one advertised?

A: 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.

Q: Can I install an EPA or CSAB415.1-10 certified heater on an 8-inch chimney?

A: 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.

Q: Do I need to install a fresh air intake on my wood heater?

A: A fresh air intake is not mandatory for your wood heater, unless the unit is installed in a mobile home or if the local building code or the manufacturer requires it. If the heater is installed in an open room, in a house that is more or less air-tight, combustion air will normally be easily replaced. In this case, the installation of a fresh air intake is not required. It must, however, be noted that a fresh air intake, even if it is not mandatory, will always provide the advantage of better balancing the house with regards to combustion air. If the house has a powerful mechanical exhaust system that may be used while the heater is burning (ex: range hood), a fresh-air intake will be required.

Q: How much heat transfer should I get from my fireplace using a forced air kit?

A: Several factors can affect the amount of heat transferred to your rooms through a forced air option. The length of the system, the deviations and the insulation of the conduits can have a major impact. It is recommended to use a short system with few deviations. The heat transfer will be optimized when your fireplace is hot. Heat transfer too soon when the fireplace has not reached its optimum combustion temperature can cool the combustion chamber too quickly and cause poor combustion. An overpowered fan can also lead to the same negative effects. The ideal situation is a lower but constant air flow when the fireplace is hot. We can therefore expect to transfer at least 25% of the heat from the appliance to other rooms. It should be noted that the systems sold with your fireplace have been tested for safety by the appliance manufacturer. If you do not use the original system supplied by the manufacturer, you expose yourself to a risk of fire. If in doubt, consult a professional installer.

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After processing, your order will ship and should arrive within 5-7 business days, depending on your location
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