REOTEMP S2-F1 Pipe Clamp Surface Hot Water Thermometer

I am using this on a hydronic floor heating system for the return (cold) side. I already have a combination temp/pressure gauge on the hot side, but its nice using this to see the return water temp side. It gives a good idea of the temp drop through the loops. Its a little loose on 3/4" pipe with the length spring they send, but you can shorten it up and it holds fairly well. If you are going to mount it where there is vibration you may want to consider gluing it to the tubing instead. Accuracy is.. close. I checked with a temp gun and it seems to be off by about 3 degrees at 155F. Obviously, wouldnt be using this on anything that requires a much greater accuracy, but for my purpose its just fine. We'll see how long it lasts - but no complaints so far.

Clamped this to my water heater supply to monitor temp. Helped me resolve an issue with it.

The spring is too long for 3/4" copper. I put some bubble wrap behind the spring and the thermometer works fine.

Very happy with purchase but here is a tip for accuracy, the unit was 5 DEG Fahrenheit off , so to adjust the measurement take a digital temperature gauge to hot water coming out of the tap nearby, then turn the hex adjustment on the back of the Reotemp unit to match the temp out of the hot water tap and also make sure you attach the reotemp to the output of the hot water tank (not the input)…

This does not fit 3/4” copper pipe as stated in the description. Had to rig something up to make the thermometer work

The units works well. However they must be securely attached to the line. The springs provided does not work well on smaller pipe so wire ties may Suite you better as it did for me.

I liked the analog look and it’s easy to read. Guessing the temperature could be off by 10-15 degrees because it not a probe or wrapped around the pipe. I helped me figure out my circulation line and radiant heating. Trying to figure out the temperature coming back.

Seems to be well made and accurate. Side note: (1) This product works through thermal conductivity, so there is going to be lag time until the display catches up. (2) Since the pipe I attached it to is round, and the back side of the thermometer is flat, I added thermal paste (nasty stuff to work with) to increase its surface area. (3) The dial face is adjustable, there are two very small set screws on the back. Loosen them and rotate the dial body to make your adjustments. So, overall I’m satisfied with my purchase.