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Williams Monterey PLUS - 35k BTU - Gas Top-Vent Wall Furnace - LP - 70% AFUE - Single-Sided
Model:
3509821
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Recommended Accessories

Expert Recommended Accessories
Selected by Ken, our Expert
Optional Accessories
11
$16.00
In-Stock
Model: P090553
$110.00
Factory-Direct
Model: 4915
$400.00
Factory-Direct
$110.00
$110.00
Only 1 In-Stock
Model: P322016
$35.00
In-Stock
$272.00
In-Stock
$110.00
Only 1 In-Stock
$192.00
In-Stock
$299.00
In-Stock
Model: 9929
$290.00
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Features
- Safe Pilot Ignition
- With matchless pilot ignition, the guess work is taken out of lighting the furnace. By sealing the pilot and ignitor away from dirt and debris, the electronic igniter lights the furnace safely and reliably.
- Power Free Operation
- A lot of things can go wrong during a power outage, but your furnace shutting off is not one of them. It will continue to work even when you lose power.
- Efficient Draft Hood Design
- The side-relief opening draft hood is designed to pull draft air from the sides of the furnace to limit heat loss through the chimney.
- Vent Limit Safety Switch
- The vent limit safety switch is equipped on all Monterey PLUS furnaces. This turns off the unit in case the chimney is blocked, protecting your family from carbon monoxide and fires.
- Optional Blower
- An optional blower offering manual or automatic operation is available. This improves circulation of the warm air and reduces temperature differences throughout the room.
The Williams Monterey PLUS+ Wall furnace is an ideal solution for you space heating needs. The patented side relief draft hood design reduces heat loss and ensures that you spend less and stay more comfortable. Whether recessed into the wall or surface mounted using the optional free standing kit, the soft-white powder coated finish provides a discrete durable finish that blends into any home's decor.
Product Note
A thermostat does not come included with this unit and is required. The Williams P322016 thermostat is compatible and can be found under the "Accessories" tab. Alternatively, any standard millivolt thermostat can be used.
California residents see
Warning: This product can expose you to chemicals including Epichlorohydrin which is known to the State of California to cause Cancer.
For more information go to: www.p65Warnings.ca.gov
Specifications
3509821

Overview
Product Category
Furnace
UPC
093909299279
General Information
Type
Gas Wall Furnace
Product Line
Monterey PLUS
Product Category
Furnace
Fuel Type
Fuel Type
To create heat, some form of fuel is required. Fuel Type specifies what the product uses as an input to create heat.
Liquid Propane
Vent Type
Vent Type
Products that use combustion (burning) of fuel to create heat also create potentially dangerous gasses that need to be exhausted (AKA "Vented"). Depending on the product, venting can be done via a chimney, through a side wall, or use a second vent to provide fresh air to the appliance.
Chimney Vent
Modulating/Staging
Modulating/Staging
Stages are unique speeds or levels that equipment can operate at. More stages allow for better fine-tuned control of output, which improves comfort and efficiency. Modulating equipment can operate across a range of levels, giving the highest level of fine-tuned control. Learn More
Single Stage
Mount Type
Wall
Gas Conversion Kit
Available
Performance
AFUE
AFUE
AFUE (Annual Fuel Utilization Efficiency) measures the efficiency of combustion equipment over the entire heating season, and is calculated by dividing the amount of energy that is actually heating your home by the total energy contained in the fuel used by the boiler/furnace. Learn More
70 %
Heating BTU
35000
High Fire Input
35000 BTU
High Fire Output
25000 BTU
Dimensions
Gas Connection Size
1/2 Inch
Product Height
65 3/4 Inches
Product Width
16 Inches
Product Depth
6 Inches
Product Weight
73 Pounds
Shipping Weight
83 Pounds
Certifications
CSA Listed
Yes
Warranty Information
Parts Warranty
Parts Warranty
A warranty is a safeguard from defects in manufacturing and can vary in length and terms. Some manufacturers require registration for extended warranty benefits, be sure to check out features and the warranty document. To see the manufacturer's warranty statement, click on the Manuals tab. Learn More
1 Year
Heat Exchanger Warranty
Limited 10 Years
Reviews
(25)
Williams 3509821 Reviews & Ratings
Customer Rating
4.76
(25 Ratings)
94% recommend this product
5
(19)

4
(6)

3
(0)

2
(0)

1
(0)


Fantastic
By Christine L
OXFORD, Connecticut
Purchased 11/24/2021 |
Review Posted 12/17/2021
Fantastic looks great. The blower has 3 settings. Love it all. This is the 2nd unit I have purchased. I will purchase more when and if I need. Customer service is above and beyond helpful.
Christine L Recommends This
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Rating Breakdown
5/5
5/5
5/5
5/5
Pros:
Easy To Use, Id Buy It Again, Durable, Exceeded Expectations

Great Customer Service When We Needed It
By Sofia W
Pinedale, Wyoming
Purchased 10/14/2021 |
Review Posted 11/16/2021
We have 5 units we got for our historic cabins - wall mounted and out of the way with a huge capacity for heating up the cabins in freezing cold winter weather. We adjust them for high altitude and propane use. Only one unit would not work properly, and after our technician did everything he could in replacing all moving parts, we still were left with the same issue, determining it much be a defect unit. We received a new one, sent out immediately and happily installed without further issue. Still would buy the same heaters again!
Sofia W Recommends This
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Rating Breakdown
5/5
4/5
5/5
5/5
Pros:
Easy To Use, Quiet, Light Weight
Cons:
needed adjustments

Love It!
By Christine L
Oxford, Connecticut
Purchased 01/25/2021 |
Review Posted 02/16/2021
Not only is the product what I wanted. I just want everyone to know that the customer service is FANTASTIC!. They will go out of their way to help you with any and all questions
Christine L Recommends This
Was this review helpful?
Rating Breakdown
5/5
5/5
5/5
5/5
Pros:
Easy To Use, Quiet, High Quality, Id Buy It Again
Cons:
There is no Cons

This Is A Great Heater!
By Cindy F
Tollhouse, California
Purchased 09/01/2020 |
Review Posted 12/03/2020
The delivery was quick and the heater is such a wonderful addition to our home. we would buy this product over and over again.
Cindy F Recommends This
Was this review helpful?
Rating Breakdown
5/5
5/5
5/5
4/5
Pros:
Id Buy It Again, Easy To Use, Quiet, High Quality

I have only had this heater for a week, but am very pleased thus
By Linda W.
Bella Vista, California
Purchased 02/14/2020 |
Review Posted 03/10/2020
I like the fan with two speeds.
Linda W. Recommends This
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Rating Breakdown
5/5
5/5
5/5
5/5

a very good product !
By Lois S.
Big Rapids, Michigan
Purchased 12/11/2019 |
Review Posted 01/20/2020
It does a great job heating. We got good advice from people who service Williams products. Everything went good installing.
Lois S. Recommends This
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Rating Breakdown
5/5
5/5
5/5
5/5

PRODUCT IS DOING ITS JOB.
By Edward D.
East Tawas, Michigan
Purchased 12/04/2019 |
Review Posted 01/17/2020
THE WALL FURNACE IS very efficient, warms the room to perfection, my Furnace installer liked how the Furnace was packaged ready for the install.
Edward D. Recommends This
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Rating Breakdown
4/5
4/5
4/5
4/5

Good furnace for small space
By Amin A.
Ann Arbor, Michigan
Purchased 12/05/2019 |
Review Posted 12/30/2019
Good furnace for small space or mobile home. It doesn't have a fan so heat will rise quickly but there is a fan accessory you can buy or if you have a ceiling fan that will help to disperse heat. I bought a back register kit to heat the bedroom located behind the furnace, which I highly suggest for any similar room situation. Overall, a good buy for the price point.
Amin A. Recommends This
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Rating Breakdown
4/5
4/5
4/5
5/5

So far So Good
By Caroline O.
North Hollywood, California
Purchased 11/21/2019 |
Review Posted 12/13/2019
Delivered in good condition and installed by my handyman in a couple hours. Puts off good heat.
Caroline O. Recommends This
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Rating Breakdown
5/5
5/5
5/5
4/5

GREAT FURNACE - BEST PRICE
By Lynne M.
Portal, Arizona
Purchased 11/12/2019 |
Review Posted 12/10/2019
Our second Williams wall furnace, the first one lasted 25 years! It arrived in a timely fashion, perfect condition, easy to install. This furnace was $400 cheaper than a well known home improvement store and the shipping was free. Will do business with ecomfort again and recommend them to all.
Lynne M. Recommends This
Was this review helpful?
Rating Breakdown
5/5
5/5
5/5
5/5
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Williams Monterey PLUS - 35k BTU - Gas Top-Vent Wall Furnace - LP - 70% AFUE - Single-Sided




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