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8004 or 157004 SHORT Extension Kit All Monitor Heaters

FREE SHIPPING - USA               See below for International Shipping


Fits all Monitor Heaters

Part # 157004 or Part # 8004


This kit extends the distance between the exhaust port in the back of the heater to the flue pipe that goes thru the wall from 11.5" to 20.25"


If you need a different size, we have all sizes in stock.  Please refer to the Information Section in this listing for details and links.  


Use this part if you need to exhaust your heater anywhere but directly behind the can exhaust to the left, right or up by the measurements stated.This part connects to the flue pipe which is NOT included.


SHIPPING: We ship SAME BUSINESS DAY if payment is received by our daily deadline excluding holidays and when we put our store on vacation or when handling time has been increased temporarily.

If you need a shipping option other than the ones we have listed, such as INTERNATIONAL, OVERNIGHT, FEDEX or UPS, etc, contact us PRIOR to ordering and we will make the option available for you.


INTERNATIONAL BUYERS: Returns are NOT accepted for International Buyers. We are not liable for lost, damaged or stolen items. We please advise you to "Buy at your own risk" when purchasing internationally as the package is out of our control once it leaves the United States. You may incur additional expenses and or fees charged by your country for this item. The price that you have paid us for shipping only covers shipping the item to you, it does not cover additional fees (import, taxes, etc.) that may be required and collected by your country.


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Monitor Heater Parts # 8004 or #157004 SHORT Extension Kit All Monitor Heaters

8004 or 157004 SHORT Extension Kit All Monitor Heaters

  • Monitor Heater Extension Kits

    We have four different Monitor Heater Extension Kits.  These kits are listed below with details. 

    • Monitor Heater Extension Kits are for installations where you need to install the flue pipe somewhere other than directly behind the heater. 
    • You can have the flue pipe up to 16.5 feet away from the exhaust port on the back of the heater (Left, Right, Diagonally, or Up) but not down. 
    • You must have a Monitor Flue Pipe (not included in this sale) to connect the extension kit to.  
    • This kit increases the distance from the exhaust and air ports on the back of the heater to the exhaust and air ports on the flue pipe.   
    • Toyostove Laser Heater Extension Kits and Flue Pipes are NOT interchangeable with Monitor Heater Extension Kits and Flue Pipes.  

    Monitor Extension Kit Options:

    Maximum Lengths and Bends Allowable using Extension Kits:

    Refer to photos included in listing for examples

    • 16.5 feet MAX length - 1 (one) 90° bend 
    • 13 feet MAX length - 2 (two) 90° bends 
    • 10 feet MAX length - 3 (three) 90° bends 

    You may have to use a different Air Damper if you use an extension kit:  

    Depending on which model Monitor Heater that you are installing as well as which extension kit(s) and your altitude, a different Air Damper may be required.  Please Contact Us for details.  


    If you have a thick wall to go through, you will need a Flue Pipe Extension and those are available in our web store:  

    Standard Flue Pipe (walls up to 8.5 inches thick)

    Medium Adjustable Flue Pipe (8.5 inch to 12.5 inch wall thickness)

    Long Adjustable Flue Pipe (12.5 inches to 20 inches wall thickness)

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