NZXT H2 Flow vs Thermaltake Urban S21 Case Comparison

The main differences between NZXT H2 Flow and Thermaltake Urban S21 are in External 5.25" Drive Bays, External 3.5" Drive Bays, Internal 2.5" Drive Bays and Internal 3.5" Drive Bays.

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NZXT H2 Flow	Thermaltake Urban S21
Prices (Change region) In Stock Free shipping $149.99 Out of Stock $189.14	Prices (Change region) - Buy now
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Pangoly Score (How do we rate?) -	Pangoly Score (How do we rate?) 77
Brand NZXT	Brand Thermaltake
Model CI-H21FB-01	Model VP800A1W2N
Release Date 📅 February 2026	Release Date 📅 May 2013
* First availability for purchase, it may not correspond to the actual market launch date.
User reviews Add a product review	User reviews ★★★★★ (4 reviews) Add a product review
Price history View Details ►	Price history View Details ►
Compatible PC parts Motherboards ► Graphics Cards ► Power Supplies ► CPU Coolers ►	Compatible PC parts Motherboards ► Graphics Cards ► Power Supplies ► CPU Coolers ►
Pros -	Pros 2x Quiet fans included Long graphic cards support Build quality
Cons -	Cons Poor cable management Not much space for high CPU coolers
Type Mini ITX Tower	Type ATX Mid Tower
Color Black	Color Black
Includes Power Supply No	Includes Power Supply No
External 5.25" Drive Bays 0	External 5.25" Drive Bays 3
External 3.5" Drive Bays 0	External 3.5" Drive Bays 1
Internal 2.5" Drive Bays 2	Internal 2.5" Drive Bays 0
Internal 3.5" Drive Bays 0	Internal 3.5" Drive Bays 5
Motherboard Compatibility Mini ITX	Motherboard Compatibility ATX, Micro ATX, Mini ITX
Front Panel I/O USB 3.2 Gen 1 Type A, USB 3.2 Gen 2x2 Type C	Front Panel I/O USB 3.2 Gen 1 Type A
Dimensions 263 mm x 181 mm x 435 mm	Dimensions 436 mm x 185 mm x 497 mm
Volume 21 L	Volume 40 L
Max VGA length allowance 331 mm	Max VGA length allowance 320 mm
Expansion Slots 3	Expansion Slots 7
Back Connect Support No	Back Connect Support No