The premium probe thermometer for use on double wall black stove pipes (not Class A pipes). Our probe thermometer is fabricated in three layers: high temperature steel core for longevity, clad with pure copper for fast conductivity, and chrome-pleted to resist corrosion. Durable porcelain enamel with zones clearly indicated—shows temperature inside the flue pipe at a glance. 4-inch stem engineered to accurately measure temperatures up to 1700° Fahrenheit, for any diameter flue pipe up to 8 inches. Rugged steel case. Mounts easily through a 1/4 inch hole. Magnet and eyelet included. *Note: Not recommended for single wall pipe.

Directions for Use

Probe thermometers are designed for insertion into the stovepipe, with the end of the probe approximately centered inside the flue for accurate readings.

To install, drill a 1/4-inch hole in the flue pipe at least 18 inches above the top of the stove or furnace. For double-wall pipe, drill a 1/4-inch hole in the outer wall, and a 3/16-inch hole through the inner wall. Position so the thermometer can be read easily at a glance. Slide the eyelet and magnet onto the stem of the thermometer; and insert into the hole.

When properly installed, the thermometer accurately reads flue-gas temperatures with an error margin less than 5%. If placed closer than 18 inches from the top of your stove or furnace, the thermometer will read slightly higher. Creosote on the stem of the thermometer will have little effect on the readings. When used on horizontal stovepipes, add 6% to temperature readings due to lower heat transfer. Before cleaning your flue pipe, remember to remove the thermometer.

Guidelines for Probe Thermometer Temperature Readings

Consult your stove manufacturer's manual for precise temperature recommendations. See below for approximate guidelines, if the thermometer is installed properly on the flue pipe. Note that flue gas readings are approximately 50% higher than surface temperature readings:

100°F to 400°F: Temperature too low. Incomplete combustion, causing smoke, soot and hazardous creosote. Open draft and/or add dry fuel.

400°F to 900°F: Safe operating temperature. Complete combustion and best efficiency.

900°F to 1600°F: Wasting energy, possibly overheating. While high temperatures are often reached on initial firing, should not be maintained for normal operation. Reduce draft.

Chimney & Stove Pipe Accessories and Adapters