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How do I adjust the Voltage for an immersion heater?

Discussion in 'General Electronics Discussion' started by AskMyDog, Aug 30, 2016.

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  1. AskMyDog


    Aug 30, 2016
    It's been a long time since my very basic electrical engineering courses in college, and I've gotten myself into a little project that I need help with.

    I have a small (1500W) immersion heater that plugs into a standard US wall outlet that I'm using for a DIY sous vide cooker. In large pots of water the immersion heater is fine, but for smaller volumes of the water the heater is too powerful, heating the water too quickly, causing the cooker to overshoot its target temperature.

    Is there a simple or a cheap way to basically turn a knob that will lower the voltage of the heater and keep it from heating the water too quickly?
  2. Minder


    Apr 24, 2015
    You could either make a suitable duty Triac controller (cheapest) , or there is high current dimmer style ones made for power tools that can be purchased.
    If you Google AC triac control, it should bring up alot of posts.
    Only half dozen components needed, DigiKey is a good source of parts.
  3. AskMyDog


    Aug 30, 2016
    Great! Thanks!
  4. Bluejets


    Oct 5, 2014
    Or a rather large diode(20A) for approx. 1/2 power

    Have you thought about a simmerstat also?
    Used on cooker full grunt for small amounts of time.
    Time on depending how far you turn the dial.
    Regulation (switching action) is supplied from an internal set bimetal contacts.
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