White-Rodgers Low V Mechanical Thermostat, 1E30N-910

This t stat works as described. I have a gas furnace from the 1930's with a standing pilot, mili volt system. Looks great, works, is designed to screw into an existing electrical box.

This mechanical thermostat is ideal for replacing an old-style model with a mercury-in-glass switch. (Drop old Hg switch at HazMat roundup!) Base dimensions are 2.75" W x 4.5" H, with 2 mounting screws 3.25" apart on the vertical centerline. This model includes a "heat anticipator" which is simply a resistor that gently warms the sensor while heat is on (about 0.1 Watt) to tune overshoot and cycle times. Different furnaces draw differing current to operate, so you must adjust this resistance (about 0 to 2 ohms) to work with your furnace and produce the correct amount of sensor heat within the thermostat. The anticipator is calibrated in Amps, for the current your furnace relay draws when the heat is on. If your old T-stat has an anticipator, copy this setting. My gas furnace was a thermopile-powered "millivolt" system, so I adjusted the anticipator to 0 ohms (the 1.2A setting). The documentation is not entirely clear that the anticipator pointer onto the calibrated scale is opposite the wiper that actually touches the resistance wire. One other adjustment I made was to calibrate the temperature indicator by turning the screw on the back side of the cover; it read about 5 deg F high when received. Trouble free after that.

Looks a lot better than my old tan versions. They could make it a little more modern-looking.

product fit good and customer was happy. I had to match an old school thermostat in an older house and this one worked like a charm. Shipping was good and fast, easy to use and brought the heat level up to where it needed to be.

Classic appearance, no batteries to worry about, easy install.

It's only 2 wiresOnly 2 wires that need to cross. And this plastic trash can't even do that.pathetic. they take an old simple concept and completely screw it up with crap parts and everything plastic.It's only 2 frickin wires.I'm searching for a unit made in the 1950s in a garage sale to replace this crap. The Original one will still work perfect. Why do we destroy quality for plastic crap just to make more money

I do like the classic and simple design of these and install quite a few for boiler Heat-Only jobs. The catch is every other one I install requires manual fine calibration. Adjusting the thermometer dial is fairly easy. Just pop off the clear faceplate and rotate the dial. Micro-adjustments to the temp lever though is a bit more involved, doable but tedious.Still, unlike the common round T87's (newer models do have electronics) these truly are purely mechanical. For forced air you'll want a different model. But once calibrated, on a basic 2 wire system I find these ideal.**UPDATE**Do NOT recommend these in hydronic boiler systems with zone valves. Every one I've installed the anticipator wire burns out. The nichrome resistance wire can't support the current draw. Specifically with TACO ZV heads.Rather than replace them all, each one was modified by soldering on a 0.5Ω 5W ceramic resistor. Anticipator will no longer be adjustable. But this is approximately equal to std calibration value used by most systems.

After 15 years of using the original mercury switch thermostat, I finally replaced it with the new magnetic switch type. The only reason I replaced it in the first place was because the spring in the thermometer had lost some tension therefore the room temperature wasn’t accurate. I easily replaced the entire device using only a screwdriver.

remplacement du thermostat pour foyer au gaz. Tout est parfait et la livraison fût rapide.

Perfect for in-floor heating heat only function and 3 days delivery only and accurate reading

I needed a new basic thermostat for my gas fireplace to replace an older one that the plastic had yellowed over the years.Unfortunately a basic on off thermostat like this costs a lot more than many electronic digital thermostats which I wanted to avoid.Easy to install and mercury free.

parfait pour remplacer mon ancien Thermostat au mercure de mon foyer au gaz naturel!

This should have been a straight forward installation, two wires connecting to a .750 V system. Didn’t work right off the bat. My neighbour is an electrical engineer and he checked it out with his meter. There was no continuity between the terminals, but if the bare wires were touched to other random contact points, it would connect on some of them.