Thermaltake CL-W245-OS00YE-A T1000 Yellow Coolant 1000ml — main product image

Thermaltake CL-W245-OS00YE-A T1000 Yellow Coolant 1000ml

Thermaltake

Thermaltake CL-W245-OS00YE-A T1000 Yellow Coolant 1000ml

Name: Thermaltake CL-W245-OS00YE-A T1000 Yellow Coolant 1000ml
Brand: Thermaltake
SKU: CL-W245-OS00YE-A

★★★★★4.6 (399 reviews)

Low-viscosity, anti-corrosive yellow coolant with color-stable formula keeps your custom loop flowing clean and visually consistent over the long haul.

$26.99*

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*Price sourced from Amazon.com. Last updated:Jul 14, 2026.Price and availability are subject to change.

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Overview

The Thermaltake T1000 Yellow Coolant is a 1000ml pre-mixed water cooling solution engineered for custom PC liquid cooling loops. Its headline specification is viscosity: at 20°C the T1000 measures 26.4% lower viscosity than the benchmark competing solution, dropping to a 25.8% advantage at 40°C operating temperature. In practical terms, lower viscosity means a given pump delivers more flow volume at the same RPM, reducing head pressure across restrictive waterblocks and fittings. This is a meaningful efficiency gain in high-resistance loop configurations — particularly full-coverage GPU blocks and dense copper radiators — where pump curve limitations can become a thermal bottleneck. The anti-corrosive additive package protects metallic loop surfaces from oxidation-induced degradation, and the minimized-precipitation formula is specifically designed to prevent the particulate buildup that clogs micro-fin waterblock channels over time.

The T1000 is designed for builders who want a maintenance-ready coolant that doubles as a visual element in their build. The transparent yellow formula is color-stable by design — Thermaltake's formulation prioritizes hue consistency over the full rated service life, rather than treating color as incidental. For builders who want to dial in a specific tone, the T1000 is compatible with Thermaltake's TT Premium Concentrate Dye system (sold separately), enabling custom blending across the seven available T1000 base colors. The 1000ml volume is correctly sized for the majority of single-GPU loop configurations; multi-radiator or large-sump builds should budget for two bottles to ensure adequate fluid for initial fill and air-bleeding. Non-flammable chemistry is a practical specification that simplifies the fill process, and the 2-year warranty provides a clear service interval benchmark for planned maintenance cycles.

Key Features

Clearly Colorful - comes in 7 transparent colors red blue purple orange acid Green green and yellow Our formula ensures color saturation stability and duration

Make it unique - Pair with TT Premium Concentrate Dyes (P/N cl-w221-os00sw-a) to create custom colors for any build theme

Better formula for better system - The new formula minimizes the possibility for precipitation to ensure clear water cooling solution flow for your system

Flow like pure water - t1000’s low viscosity enables its effective flow At 20°C T1000 coolant has 26 4% lower viscosity than other water cooling solution and 25 8% lower at 40°C

Anti-corrosive solution - T1000 is non-flammable and provides great protection for the entire cooling system from corrosion

2 year

Specifications

Brand

Thermaltake

Model

CL-W245-OS00YE-A

Capacity

1000ml

Color

Yellow Transparent

Viscosity Advantage

26.4% lower than competitors at 20°C; 25.8% lower at 40°C

Flammability

Non-flammable

Corrosion Protection

Yes

Precipitation Resistance

Minimized precipitation formula

Compatible Dye System

TT Premium Concentrate Dyes (CL-W221-OS00SW-A)

Warranty

2 years

Pros & Cons

👍 Pros

26.4% lower viscosity than competing coolants at 20°C enables better flow efficiency through restrictive blocks and longer loop runs, reducing pump load.
Anti-corrosive formula provides active protection for loop components rather than acting as a passive neutral carrier fluid.
Non-flammable formulation adds a practical safety margin when filling and maintaining the loop around electrical components.
Color saturation stability is engineered into the formula, meaning the yellow hue maintains consistency over time rather than fading or shifting — important for builds where aesthetics are part of the design intent.
Minimized precipitation formula reduces the risk of sediment accumulation in pump impellers, flow meters, and waterblock channels.

👎 Cons

1000ml capacity may not fill complex multi-radiator or large-reservoir builds without a second bottle — no single-purchase bulk option at this size.
Yellow transparent color, while vibrant, limits the palette to one specific tone — users wanting a different hue must purchase the separate TT Concentrate Dye system for customization.
Anti-corrosive additives do not compensate for mixed-metal loop construction — copper/aluminum loops will still experience galvanic corrosion regardless of coolant chemistry.
Thermaltake's 2-year service life recommendation requires periodic full loop draining and refilling, which is time-intensive in complex builds.
No biocide concentration is specified publicly, which makes it difficult to assess how the T1000 compares to coolants with explicit anti-microbial formulations for preventing algae growth in lightly cooled reservoirs.

Frequently Asked Questions

What is the viscosity of the T1000 compared to standard water cooling solutions, and why does that matter?

At 20°C, Thermaltake rates the T1000 at 26.4% lower viscosity than competing coolants; at 40°C, the advantage is 25.8%. Lower viscosity means the pump works less to maintain flow rate, which translates to marginally better thermal performance and reduced pump wear over time — particularly relevant in systems with longer loop runs or restrictive waterblocks.

Will the T1000 cause corrosion or react with my loop components — copper, nickel, aluminum, or acrylic?

Thermaltake formulates the T1000 as an anti-corrosive solution. However, mixing metals in a cooling loop (e.g., copper/nickel blocks with aluminum radiators) creates galvanic corrosion risk regardless of coolant chemistry. The T1000 is not a substitute for building a compatible single-metal or coated loop — confirm your component material compatibility before filling.

Can the T1000 yellow be mixed with other Thermaltake coolants or concentrate dyes?

Yes. Thermaltake explicitly designed the T1000 line to pair with their TT Premium Concentrate Dyes (P/N CL-W221-OS00SW-A) for custom color mixing. Mixing with non-Thermaltake third-party coolants is not recommended, as incompatible formulas can cause precipitation, which the T1000's own formulation is specifically engineered to minimize.

How often does the T1000 need to be drained and replaced?

Thermaltake provides a 2-year warranty on the product, which broadly aligns with the industry-standard recommendation of draining and refilling a custom loop every 12–24 months. Loop condition, operating temperatures, and whether biocide additives are used all affect actual service intervals.

Is 1000ml sufficient to fill a complete custom loop?

For most single-GPU custom loops with one radiator and a reservoir, 1000ml is sufficient. Complex dual-GPU or multi-radiator builds with large reservoirs may require a second bottle. It is better to have a spare bottle on hand during the fill process to top off the loop after bleeding air.