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Reg CFTRL65.4–6.5Tier IOpen

Hearth Reactor Works

Hearth Microreactor, Series A

Preferred equity in a five megawatt heat-pipe reactor with a witnessed prototype and no pumps to fail.

Heat pipes move heat by evaporation and condensation inside a sealed tube. No pumps, no coolant loop, no loss-of-flow accident to design against. Hearth has demonstrated a full-power thermal prototype under third-party witness at a national laboratory and is preparing a construction permit application for a five megawatt unit at Idaho Falls.

Idaho Innovation Campus · Idaho Falls, IDConstruction permit filedEscrow: Cadence Escrow Services
TRL 6 of 9, band 5.4 to 6.5, signed by Dr. Samuel Adeyemi, PhD Nuclear Engineering; ASME Section III reviewer, on Jun 9, 2026.See the evidence it rests on

$3,860,000 committed of $5,000,000

$1,930,000 released · 77% subscribed

Released to the issuerCommitted, held in escrowRemaining
Minimum
$100

$13 per unit

Instrument
Preferred equity
Term
None
Investors
1,412

Closes October 15, 2026 · 32 days remaining

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Use of proceeds

  • 46%Full-scale prototype build
  • 22%NRC construction permit application
  • 18%TRISO fuel qualification
  • 9%Team and working capital
  • 5%Offering expenses and platform fees

The issuer

Five megawatt heat-pipe microreactor for remote industrial and defense loads. No coolant loop, no pumps, factory-assembled and transported by truck.

Legal name
Hearth Reactor Works, LLC
Entity
Delaware LLC
Jurisdiction
Delaware
Founded
2021

  • Priya RaghunathanChief Executive Officer

    Formerly principal engineer on a national laboratory heat-pipe demonstration program.