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Old 02-06-2013, 07:08 PM   #1
Willie3
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Default Heat Sink Really Needed?

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!

WW

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Old 02-06-2013, 07:31 PM   #2
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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
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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
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Search threads for "PWM boil kettle". Good info there.

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Old 02-06-2013, 08:14 PM   #5
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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
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