Ecolab closes $4.75B CoolIT deal early, claims 40% AI cooling market share

Ecolab closed its acquisition of CoolIT Systems on Thursday for $4.75 billion, ahead of the expected first-quarter 2025 timeline, and now controls an estimated 40% share of the direct liquid cooling market serving AI data centers. The Saint Paul–based water treatment and sanitation company disclosed the early close alongside revised FY26 guidance that bakes in cooling-platform revenue contributions six weeks sooner than Wall Street modeled.

CoolIT specializes in direct-to-chip liquid cooling loops that handle heat densities above 100 kilowatts per rack—the threshold where air-cooling economics break. Ecolab already supplied water treatment and chemical programs to 60% of North American hyperscale data centers; the CoolIT stack adds the hardware layer that sits between the server and the water loop. The combined business targets $4 billion in annual data center revenue by 2030, up from an estimated $1.2 billion run rate at close. Management told analysts Thursday that backlog visibility extends through mid-2026, driven by build-outs at three unnamed hyperscalers and two sovereign AI clusters in the Middle East.

The timing matters because the liquid cooling retrofit window is narrow. Nvidia's Blackwell and GB200 NVL72 systems ship this quarter with thermal design points near 120 kilowatts per rack, and most legacy air-cooled facilities cannot handle the load without costly HVAC overhauls or density de-rating. Ecolab's pitch is end-to-end: CoolIT's cold plates, Ecolab's water chemistry to prevent fouling and corrosion, and monitoring software that flags efficiency drift before it becomes downtime. The company disclosed Thursday that 18 hyperscale sites are already running proof-of-concept deployments, with conversion to full rollout expected in Q2 and Q3. The average deal size for a 10-megawatt AI pod is $35 million to $50 million over three years, split roughly 60/40 between hardware and recurring chemical and service contracts.

The acquisition also repositions Ecolab against incumbents like Vertiv and Schneider Electric, both of which have cooling portfolios but lack Ecolab's installed base in water treatment. CoolIT's engineering team of 210 employees remains intact in Calgary, and Ecolab committed Thursday to $150 million in R&D spend through 2026 focused on two-phase immersion cooling and rear-door heat exchangers for edge deployments. The company expects liquid cooling to represent 12% to 15% of its total revenue by 2028, compared to 3% today, and sees the category as the primary driver of operating margin expansion from 19.8% in 2024 to a targeted 23% by decade-end. Debt-to-EBITDA rises to 3.8x post-close but management guided to 3.0x by year-end 2026, assuming no further M&A.

Operators should watch for CoolIT integration milestones in Ecolab's Q1 2025 earnings in late April, particularly attach rates on new hyperscale wins and any disclosure of follow-on orders from the 18 proof-of-concept sites. Vertiv and Schneider are both expected to announce liquid cooling partnerships or acquisitions before June, and any competing move that bundles hardware, chemistry, and monitoring could compress Ecolab's pricing leverage. The $4 billion 2030 target implies a 28% CAGR from the current run rate, which leaves limited room for deployment delays or customer concentration risk if one of the three unnamed hyperscalers shifts architecture.

Ecolab updated FY26 adjusted EPS guidance to a range of $8.10 to $8.50, up $0.15 at the midpoint, reflecting six weeks of additional CoolIT contribution and confirms the acquisition was not priced for optionality—it was priced for inevitability.