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Home > High Altitude Gas Furnaces

Williams 2509821 Monterey Plus Top Vent Wall Furnace - 25,000 Btu/H Input - Propane (LP) - Includes Field-installed High Altitude Conversion Kit

Part Number: 2509821/9A334
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Williams 2509821 Monterey Plus Top Vent Wall Furnace - 25,000 Btu/H Input - Propane (LP) - Includes Field-installed High Altitude Conversion Kit
Williams Top Vent Wall Furnace
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Option Choices & Shipping Information
Delivery Type - Please Select One
Truck Delivery - Commercial Location [+$158.95]
Truck Delivery - Residential Location [+$199.95]
Canadian Shipment - Please Call for Price Quotation
Alaska/Hawaii - Please call for shipping costs
Delivery Adders - Please note: Liftgate Service and/or Inside Delivery is NOT included in standard truck delivery. Liftgate Required [+$60.00]
Inside Delivery Required (Garage, Shed, etc. - Does not include delivery within a residence) [+$160.00]

Williams Monterey Top Vent Wall Furnace
Williams Monterey Plus Top Vent Wall Furnace

For High Altitude Applications

Traditional Home Comfort With Lower Heating Costs
Field-Installed High Altitude Conversion Kit Included

Kit includes orifices for conversion to 2001-4000 feet, 4001-6000 feet & 6001-8000 feet elevations


Affordable and energy-efficient, the Monterey Plus+ Home Furnaces are a traditional home comfort system that delivers both quality performance and low operating costs.  Recessed or surface-mounted installation.  25,000, 35,000 and 50,000 Btu/hr. sizes.


  • Design Features

  • High-Efficiency Monterey Models

  • No electricity required

  • “Matchless” pilot igniter

  • Easy installation

  • Patented, side-relief opening draft hood design reduces flue gas temperature to minimize normal heat loss

  • Natural and propane gas models (conversion kits available)

  • Automatic temperature and safety controls

  • Re-settable vent-limit safety switch

  • Kit allows the installer to choose the correct orifices for the applicable altitude range, replace the factory-installed orifices and then adjust the furnace for that range.  Orifices that are not used may then be discarded.  

  • Thermostats are sold separately - Click Here to make a selction!

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