Lian Li A4-H2O (Mini-ITX, 11L)
The A4-H2O is an 11-liter DAN-style sandwich SFF case that still manages a 240mm AIO and a triple-slot GPU up to 322mm, an impressive feat for such a small enthusiast-tier chassis. It's purpose-built for genuinely small, water-cooled rigs. The constraints are strict by design: a 55mm cooler-height cap rules out tower air coolers, and it takes SFX/SFX-L power supplies only, not ATX.
Scores
BreakdownHideOverall69±3Caliber-forward blend — tier caliber + within-tier price rank 30%, value 25%, confidence 20%, compatibility 15%, upgrade path 10% — renormalized over applicable dimensions.
Scores
BreakdownHideCaliber-forward blend — tier caliber + within-tier price rank 30%, value 25%, confidence 20%, compatibility 15%, upgrade path 10% — renormalized over applicable dimensions.
The ± band on the overall score reflects sourcing confidence — wider when fewer specs are verified.
How each score is computed: our scoring methodology.
Specifications
| Spec | Value | Verification |
|---|---|---|
| form factor support | itxSourced | Sourced |
| max GPU length (mm) | 322Sourced | Sourced |
| max cooler height (mm) | 55Sourced | Sourced |
| radiator support | top 240mm (max 55mm radiator+fan thickness)Sourced | Sourced |
| radiator support (mm) | 240Sourced | Sourced |
5/5 detail specs sourced. Amber rows are flagged for verification — we show them as reported, not confirmed.
Verdict
Best for
- 11-liter DAN-design sandwich SFF that still takes a 240mm AIO and triple-slot GPU
Who should skip this
- Tower air coolers (55mm height cap); ATX power supplies (SFX/SFX-L only)
Known limitations
- 240mm-AIO cooling is effectively mandatory for hot CPUs given the 55mm air-cooler limit
Where to buy
List price $155
Prices are a guide and can change — confirm the current price on the retailer's site before buying.
Prices last checked Jun 14, 2026 — retailer prices change often, so click through for the current price.
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Standards
Form factors & standards — interchangeable across compatible builds, not a platform lock-in.
Compatibility
Built around Mini-ITX. Make sure the rest of your build uses the same platform before you buy — mismatched sockets, mounts or standards are the most common return reason. Check it in the builder →
Upgrade path
A solid enthusiast pick that carries into higher-tier setups as your needs grow.