Wiring a snapdisc to a heater is a fairly straightforward process. This is useful to know how to do if your heater stops working due to a bad thermostat switch. To replace a switch, first you’ll need to open up your heater. Once the unit is open, find where the temperature switch is and remove it. Make sure to note which wires are connected to the terminals. You’ll also want to make a note of how the wires are connected to the terminals before getting your switch. They will typically either clip on, or be attached with a screw. Once you’ve removed the switch, connect the wires to the terminals on the new switch and install it. Simple as that! You can close the heater back up and it should be good to go.

For more information on limit switches in heaters, check out this article. Click here to purchase a limit switch.


Overall, wiring a snapdisc to a heater is a basic DIY project that could save you from having to buy a new heater.

The Product

Our 2511 series switches can be used in high current applications; carrying up to 25 amps at 240VAC, for over 100,000 cycles (30 Amps at 12VDC for 30,000 cycles). These switches are available in a single-pole, single-throw device. A 3/4″ bimetal thermodisc at the heart of our thermostat is set to a precise temperature range within 0-350°F (-18-176°C). The temperature range determines when the thermal switch will close, or engage the electrical circuit, and when it will automatically reset, or open. Over 40 standard temperature ranges are available.

Snapdisc limit switch

For more information on limit switches in heaters, check out this article.

If you would like to know more about the various applications our snapdisc thermostats are used in, click here

For more information about our snap disc thermostats, click here.

Senasys is also able to provide custom options to fit your specific requirements. If you are unable to find a snapdisc that fits your specific needs, contact us!

As always, we love to hear from our customers about how they use our products. If you have an interesting application, tell us more about it here!


2 Responses

  1. When using a surface mount on a metal tank, would a thermal transfer paste or grease of some kind be a good idea? How suceptible to outside temp are they? Should I have a cover with insulation since it’s really only going to be used when it’s cold? I’m using a disc on an WVO oil tank with a heater, it’s set to keep it below 120° just to get warm enough to pump it out when turned on. Would potting in epoxy be a bad idea?

    • Adding thermal paste is never a bad idea. Adding insulation could also help with response time. You could add epoxy, but be careful to use it sparingly. If any gets inside the switch then it will no longer function properly.

Leave a Reply

Your email address will not be published. Required fields are marked *

Part Number Search
Can we help you find something?


    Temperature Switches
    Industrial Controls