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Old 02-06-2013, 07:08 PM   #1
Willie3's Avatar
Jun 2006
Hackettstown, New Jersey
Posts: 765
Liked 8 Times on 4 Posts

Looking into installing a Solid State Relay 25A and POT to control a 120v 1500w Hot Water Heating Element.

As it is currently, the element produces a nice boil but the boil is so violent that it bubbles over sometimes. Need to control the heat or get a larger kettle, but if I go the latter it defeats my plan.

So do I really need to include a heatsink?

Much Obliged!


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Old 02-06-2013, 07:31 PM   #2
hot_carl's Avatar
Oct 2011
Houston, TX
Posts: 113
Liked 3 Times on 3 Posts

You SHOULD use a heatsink of some sort on the SSR. It may be able to operate without it, as you will only be pulling about 12.5A(50% rated capacity)but its lifespan will be diminished if running at elevated temperatures for any period of time. Even something as simple a mounting it to a metal enclosure will dissipate heat by providing more surface area for that heat to be removed.

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Old 02-06-2013, 07:39 PM   #3
Jul 2011
Richardson, Texas
Posts: 1,025
Liked 56 Times on 45 Posts

What exactly are you doing with the pot?

You may be having a conceptual failure regarding how SSR's work. They can only be fully-on or fully-off. You are going to need some extra circuitry to go with that pot.

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Old 02-06-2013, 08:12 PM   #4
Aug 2012
Algood, TN
Posts: 38

Search threads for "PWM boil kettle". Good info there.

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Old 02-06-2013, 08:14 PM   #5
LandoLincoln's Avatar
Feb 2011
Joliet, IL
Posts: 2,989
Liked 1115 Times on 588 Posts

No, you don't need a heatsink.

Later on, you can start a thread titled "My SSR failed! Guess I should have used a heatsink!"

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Old 11-26-2014, 07:29 AM   #6
Apr 2013
San Mateo, CA
Posts: 498
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