Thermal Switch Can be used with Fireplace Blowers for automatic Reviews

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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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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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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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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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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!