The AI boom is often told as a story about chips and power. Ecolab just paid $4.75 billion to bet on a quieter part of it: keeping the chips cool.

The deal

Ecolab closed its acquisition of CoolIT Systems for about $4.75 billion in cash on July 2, ahead of the schedule it had set when the deal was announced in March, the company said. It bought CoolIT from funds managed by private-equity firm KKR, which had acquired the business for roughly $365 million in 2023 — meaning KKR is walking away with a return of around 15 times its money in about three years, according to ESG Today.

What CoolIT does — and why it's hot

CoolIT, a Calgary-based company, makes direct-to-chip liquid cooling — cold plates and coolant-distribution units that pipe fluid straight across a processor to carry heat away. That matters because AI chips run far hotter than earlier ones. The latest AI server racks draw many times the power of a conventional rack, and beyond a certain density, blowing air over the chips simply can't remove heat fast enough — water, which absorbs far more heat, becomes a necessity rather than an option. As a result, essentially every new hyperscale AI data center is being designed around liquid cooling.

The growth shows it. CoolIT is expected to generate around $550 million in sales over the next year, with sales so far this year more than doubling from a year earlier, per Ecolab. Ecolab valued the business at a rich multiple — roughly 29 times its expected near-term earnings before interest, taxes, depreciation and amortization — a price that signals how strategic it considers the market.

Why Ecolab wanted it

At first glance a water-and-hygiene company buying a cooling-hardware maker looks odd. But it fits: Ecolab already runs a data-center business built on water treatment for cooling systems, and it has framed CoolIT as roughly doubling the size of the market it can address in high-tech. Data centers consume enormous amounts of water and power to stay cool, and Ecolab's pitch is to combine CoolIT's hardware with its own water-chemistry and efficiency expertise — selling operators a way to cool AI servers while using less water and energy.

The cost of the deal

Acquisitions this size aren't free. Ecolab said it trimmed its full-year adjusted earnings guidance, citing a per-share headwind in the third and fourth quarters largely from amortization and financing costs tied to CoolIT, per its update. That is the familiar trade-off of a growth acquisition: near-term earnings take a hit in exchange for a faster-growing business.

Why it matters

For Ecolab and its investors, the deal is a pivot toward one of the few markets growing as fast as AI itself — a way to attach a steady industrial-services company to the data-center boom. For the AI build-out, it underlines that the constraint isn't only chips and electricity but heat: cooling has become a critical, capital-hungry layer of the stack. And for dealmaking, KKR's roughly 15-fold return is a vivid marker of how valuable anything tied to AI infrastructure has become. Boursel gives no investment advice; the takeaway is that a company best known for cleaning and water chemistry just spent $4.75 billion to become a player in AI infrastructure — betting that the boom's waste heat is itself a business.