Catalytic Probe Thermometers

Our innovative design measures gas temperatures right after the gas passes through the combustor so the temperatures reflect the combustor's temperature. It registers accurate readings up to 2000° Fahrenheit, and can be retrofitted to most catalytic stoves to comply with Environmental Protection Agency regulations. An indispensable tool for efficient woodstove operation, our thermometer signals when to switch off bypass, and when to reduce fire to prevent damage to combustor. It also indicates declining performance of a failing catalyst and the need for replacement.

Condar has superior USA-manufactured three-layer probe: high-temp formula steel core for long life, clad with pure copper for fast conductivity, chrome-plated to resist corrosion.

The probe end may be placed up to a half-inch away from the combustor, but should not touch it. Offered in various lengths to fit all brands. Consult instructions provided by your stove manufacturer before installing. Made in the USA.

Catalytic probe thermometers lengths are measured as shown below. The probe length that enters the stove is shorter than the overall length. Thermometer probe should be positioned 1/2 inch from the combustor.

Line drawing of catalytic thermometer with ruler showing measurement of probe section that enters the stove.

Diagram is of the 2 1/8 inch (5.4 cm) probe thermometer.

catalytic probe thermometer code price order
2.2 cm (7/8 inch) probe
for Dutchwest stoves
3-142 $30
4.8 cm (1 7/8 inch) probe
for some Blaze King models
3CX-2 $27
5.4 cm (2 1/8 inch) probe
for Dutchwest stoves
3-194 $34
10 cm (4 inch) probe
generic & Vermont Castings Intrepid I and II models
3-12-1 $37

Watchman™ electronic catalyst monitor

Achieve best performance with the innovative Watchman! Highly-responsive red LED visual display shows temperatures accurately. Maximizes the heat potential of your catalyst without overheating and damaging your combustor or stove. Pre-programmed audio signals conveniently alert you when to engage your catalyst, and when it is overheating.

  • Alerts with beep tones when to open or close bypass and when catalyst is overheating
  • Conforms with Environmental Protection Agency requirements for new catalytic stoves and fireplaces
  • Ideal for Fireplace Xtrordinair, Regency, Vermont Castings and other brands
  • Helps discern declining combustor performance and need for replacement

Through the catalytic thermometer probe port in your stove, position the 4-inch stainless-steel probe one inch from your catalyst; 6-foot thermocouple cable reaches to wherever you wish the monitor to display. Monitor can stand on hearth, or be mounted to wall (wall-mount bracket and hardware included at no extra charge).


Watchman comes complete with converter for 120-volt wall current. If desired, it can use 9-volt conventional alkaline or lithium batteries (install two in series for longer operation).


Designed by Condar and manufactured in our North Carolina factory. Made in the USA.

Watchman™ price order
electronic catalyst monitor
complete with converter, cable, and probe
AC version (can use batteries)
$200 Call to order