Kitronik Heat Activated Switch

Stock code: 2113

Pricing:Ex VATInc VAT
1+ £2.10
(excl. VAT)
(inc. VAT)
5+ £1.65 £1.98
50+ £1.35 £1.62
200+ £1.28 * £1.54 *
300+ £1.22 * £1.46 *

* Price shown includes kit bulk buy discount

In stock

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Bundled options

Kitronik Heat Activated Switch plus wire cutters

large temperature switch kit+ large wire cutters

Total: £4.00ex VAT

Kitronik Heat Activated Switch plus wire cutters and soldering starter kit

large temperature switch kit+ large wire cutters+ large soldering starter kit

Total: £16.25ex VAT


Same Day Dispatch

  • Orders placed online before 3:00pm Monday - Friday (excluding public holidays and our Christmas shutdown period) are always dispatched the same day provided the goods are in stock. If the goods are not in stock we will endeavour to contact you as soon as possible to discuss a dispatch date.

UK Deliveries

  • If you live on the UK mainland and don't have any large materials or lithium batteries in your order it will cost £3.95 (£4.74 including VAT) if you spend less than £40 (£48 including VAT).
  • If you spend between £40 and £200 (£48 - £240.00 including VAT, excluding large materials or lithium batteries) delivery is free to most locations, £12 (£14.40 including VAT, excluding large materials or lithium batteries) to Northern Ireland and £15 (£18.00 including VAT, excluding large materials or lithium batteries) to UK remote locations. For a list of postcodes that will be charged the remote location rate: remote area list.
  • If you spend over £200 (£240.00 including VAT, excluding large materials or lithium batteries) delivery is free within the UK.

Rest of the world

  • These orders are sent via UPS, and the cost is dependant on the service you choose at checkout. Alternatively you can choose the free collection option and have your own courier collect it from us. International orders can only be shipped to the registered card address. Please note: International orders may be charged import duty dependant on local import laws and duty rates. These charges are usually billed to you directly from UPS.
  • Delivery times vary for international orders depending on the service selected and the destination. You can see the delivery time and cost at the shipping stage, or by using the shipping estimator from within the shipping basket.


  • If you would like to collect your order, or use your own courier then there is an option you can select during checkout. We do not charge a packaging or handling fee for this service, and you will receive an email when your order has been processed, you can collect half an hour after receipt of this email.

Further Information

Please note: Instructions for using this product (if available) can be found under the product description.
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Soldering School - Kitronik University

How to solder - an introductory guide: If you're new to soldering our Soldering School will have you up and running in no time. What...

What voltage is required to run this circuit? Can I use the 3V Coin Cell battery board?
Asked by: Diane Brancazio
Hi Diane, Thank you for your message the kit can run from 3V to 10V. So a Coin cell would work with this but you might be limited by it's low charge running down after a short time (about 6 hours with a standard LED turned on by the kit). Best Regards Cullen
Answered by: Cullen Lewis

Is a 12volt battery too powerful for the components in the switch? I would like to use this to power a small fan in an equally small greenhouse but the battery will be charged using a small solar panel. I asked this question using the light switch yesterday as example but have not had any reply as yet Thanks
Asked by: Anthony Morris
Hi Anthony, The components on this kit has a slightly lower voltage than on the light activation kit. As such this kit can only be powered by a maximum of 10V. You could use a step down regulator to take the voltage down below 10V.
Answered by: Michael Lockhart

Hi, I would like to put leads on the thermistor to use in a solar batch heater I am making, what distance away from the board could the leads be and still work? I am thinking of using the kit to turn on the gas water heater when the solar water is cool, the heater uses a 1.5 D battery to light the gas. I am guessing the heater's system needs the ampage a D cell provides so I want to hack into the Dcell compartment , cut the link and run it to a relay worked by the kit. If that sounds possible could you advise on a suitable relay. regards steve ps I do have another question regarding this kit in either configuration, could it be used to detect a specific voltage on 1 to 3 rechargeable 1.2 volt batteries and switch off . I would like to make a solar lamp that will give out some useful light but do not want to completely empty the battery/ batteries every night.
Asked by: steve
Hi Steve, The maximum lead length would depend on the resistance of the type of w
ire being used but it would be somewhere in the hundreds/thousands of feet range. That sounds like it should be workable. I don't know the exact details of the heater and its tolerances for lighting the gas but if you powered the temperature switch kit with 2 D batteries it would output roughly 2V at up to 0.5A which I expect would be plenty for your heater if it is currently running from 1 D battery. (0.9V is lost through the transistor pair on the board.) So you might not need a relay. You could use this relay though but you would need to use 4xAA batteries with the temperature kit to trigger the relay. For your final question I would not recommend using this board to measure a specific voltage, the drop over the darlington pair is about 0.9V which is a massive proportion of the 1.2V your batteries provide. You would be better off using a voltage divider circuit and a single transistor.
Answered by: Aaron Sturman

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