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20 of 20 people found the following review helpful
on November 27, 2011
I have two Napoleon gas fireplaces in my home. The newer gas fireplace came with a thermoswitch to automatically turn on the blower when the fireplace gets hot. The older gas fireplace had a blower but it did not come with a thermoswitch. The automatic blower is a very handy feature. I wanted to upgrade my older gas fireplace to have this feature.

My local Napoleon dealer wanted $35 for a new thermoswitch. Amazon had a much better price. The only difficulty with the 19-SF2-115 switch is that it "turns on" at a lower temperature (110F) than the one supplied by Napoleon (120F).

I first tried installing this switch it to the side of the fireplace box (same location as my newer gas fireplace). The problem with this location, is that the sheet metal box stays warm at this location for a long time, even after the fireplace flame is turned off. I discovered that the blower would stay on for 3-4 hours after the flame turned off. This is probably why Napoleon uses a 120F switch instead of the 110F switch. By the way, the 120F thermoswitch switch takes a good 15 minutes to turn on.

By experimentation, I discovered that if I mounted the 110F thermoswitch on the sheet metal air deflector directly above the fireplace box (see attached photos), the blower starts approximately 2 minutes after the flame turns on and shuts off approimately 8 minutes after the flame turns off. It is the perfect location for this switch!

The switch is held in place by two magnets that I epoxied on to the sheet metal tabs on the switch (see attached photo). I wired the thermoswitch directly into the 110VAC blower circuit using a total of 8 feet of 250C high temperature wire (available on Amazon and the major auction site).

As a point of interest, I also have the gas valves on both gas fireplaces connected to a "millivolt" thermostat located on the other side of the room. The thermostat turns on and off the gas fireplace to maintain the temperature of the room. I set the thermostat in my basement to about 65F. It works very nicely to take the "chill" out of the basement.

Summary: The switch works well, but some experimentation with the location may be required.

Hope this review helps!
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14 of 15 people found the following review helpful
on April 1, 2010
Verified Purchase
This little thing works just as advertised. Hooked it up electrically in-line with the blower in the fireplace, and now the blower only comes on when the fireplace warms up (no more blowing cold air), and then after the fire is turned off, the blower stays on until the fireplace is cooled down.

I found some surplus neo-magnets at an office supply and crazy-glued them to the side tabs. That way, I could mount the switch, without drilling holes, to the bottom of the fireplace (actually, the inside top of the blower cavity).
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4 of 4 people found the following review helpful
Verified Purchase
I needed to install a fan in an enclosure for car electronics. I didn't want the fan to run all the time - just when it got over a certain temperature, and only until the temperature came back down.

The car parts store and electronics stores did not have anything. Good old Amazon.com... I found this switch and within 20 minutes of it arriving at my house I had a thermostatically controlled fan ready to install in the car. I tested it and sure enough, it worked just like I wanted!

Seems to be well built - very solid construction and has nice heft to it.
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4 of 4 people found the following review helpful
on November 26, 2008
Thermal switch(#19-SF2-115) worked as stated. Switch turned on aprox. 115 degrees after several minutes and then shuts back off around 90 degrees. The item has been installed and is working great on a wood furnace.
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6 of 7 people found the following review helpful
Verified Purchase
THE NEW THERMAL SWITCH IS WORKING GREAT NOW I CAN BUILD A FIRE AND WALK AWAY AFTER A FEW MINUTES THE SWITCH AUTOMATICALLY TURNS THE BLOWER ON AND THEN SHUTS IT OFF AFTER IT COOLS DOWN. EXCELLENT PRODUCT AT AN EXCELLENT PRICE AND SHIPPING WAS QUICK TOO I SHOULD HAVE BOUGHT ONE YEARS AGO.
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2 of 2 people found the following review helpful
on April 22, 2012
Verified Purchase
This switch works as designed and has an appropriate temperature range.

What is special is not so much the item, but the wisdom and advice of the seller.

My gas Fireplace had a number of design faults since new five years ago.

One of the issues was the fan control. The original supplied thermoswitch did not cut the fan in until 207 degrees F. The original switch was not fixed (You can not drill in a fire box). So the original unit flopped about above the box. Eventually the plastic insulators over the connectors crumbled due to heat, the switch moved and shorted against the fire box. In a shower of sparks the switch and solid state fan controller were blown and the breaker tripped at the panel.

I followed this sellers advice and used his switch that cuts in at 115 degrees F. I used the heat shrink over the connectors as extra protection.

The really brilliant piece of his advice was to use powerful small rare Earth magnets to secure the thermoswitch to an ideal location above the fire box in the airstream. Now this gas fireplace works better than ever.

So before you purchase this unit look at his installation advice and his pictures.

Unit is fine but nothing special about it. His advice free but priceless. Thank you!
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1 of 1 people found the following review helpful
on November 26, 2013
Verified Purchase
This clicks-on switch works perfectly to turn on the blower when firebox temperature is where it needs to be. If you don't have one of these you will blow cold air for a while before the firebox is hot and it will take longer for it to get up to temp.
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on November 19, 2012
Verified Purchase
I bought two of these switches (19-SF2-115) for the wood stove in my garage. I only needed 1 for this project. They came within a few days as promised. At first, I was not sure if these switches would operate properly under high temperature on the hot metal surface of a wood stove.

So while I was soldering the switch to my blower circuit, I used the heat of the soldering tip to trigger the switch. Sure enough within a few seconds of exposure to high-temp ( 120 F + ) the switch turned on, and it did not have any problem with the motor as a load. I was definitely concern about it not being able to handle the motor initial on current. After removing the heat source to the switch, it remained on for about 5-10 minutes then switched off automatically.

After my successful test with the soldering gun, I went ahead and place the sensor in the lower back of the wood stove, where it is much cooler than the stove top. It took a few minutes for the stove to warm up, but once it did the blower turned on as expected. I left the stove to burn itself out to see if the blower would turn off on by itself. Again as expected, about 45 minutes to 1 hr later, it turned off on its own.

The switch has been in operation for a couple of weeks now with almost daily operation of the wood stove, it is still holding up without a glitch. I don't know the life expectancy of these switches, with the constant exposure of heating and cooling in the long run. But over all, I am very satisfy with the performance of these switches so far.
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on April 27, 2012
Verified Purchase
I give this Thermal Switch 5 stars because it works well with my Fireplace Blower as advertised. I decided to write a review to mention this is NOT A MAGNETIZED switch and is not advertised as such, so you will have to find at least one existing screw, at the correct "hot-spot" under your firebox, to attach it to. I have a heavy sheet metal gas furnace. By taking the fake logs etc. out I was able to drill two holes in the bottom of my firebox to attach the switch underneath. I suppose you could use liquid nails or something heat resistant but I think, for a lot of your similar or more difficult fireplace applications, you might want to make your life easier and think of purchasing their magnetized switch. Being magnetized you can just reach under your firebox and pop the magnet in place. If it's not in the best spot you can move to where it to works best. No drilling.
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on February 2, 2012
Verified Purchase
I bought this thermal switch so the fan on my wood stove doesn't keep running after the fire is out. I used a couple of strong magnets to mount it, and it works like a charm. The fan comes on when the stove warms up, and runs until it's cool. Voila! Make sure you wire it properly and insulate the terminals so you don't create a shock hazard though. If you don't have experience with this sort of thing, there are pre-engineered products on the market that don't require any wiring or assembly ...
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