Inside the enclosure, the miner sits fully submerged in dielectric fluid, so it needs no fans. An integrated pump circulates the warm fluid to a heat exchanger, which passes the heat into your water: the hot tub, or a home's hot water, radiant floors, or furnace coil.
| Spec | HashTub |
|---|---|
| Miner (pre-installed) | Pleb, 24 J/TH ($3,895) or Pro, 17.5 J/TH ($4,395) |
| Heat output | ~4 kW |
| Noise | ~34 dB, no fans |
| Enclosure (H × W × L) | 20.6" × 10.3" × 19.5" |
| Dielectric fluid | ~13 gal (50 L), supplied |
| Hot tub heat exchanger | Cupronickel tube-and-shell, tub setpoint up to 104°F |
| Home heating heat exchanger | Brazed plate, outlet up to 140°F |
| Recognition | Heatpunk Innovation Award 2026 |
Three ways to use it
- HashTub by Snorkel: a handcrafted cedar tub with the miner built into its equipment box, configured and sold by Snorkel. One 60A, 240V GFCI spa circuit runs the whole tub.
- Retrofit kit: replaces the heater in an acrylic or similar hot tub. The tub's control board turns the miner on when it calls for heat; it's a 25A, 240V load, and the heat exchanger is cut into the spa's PVC loop.
- Home heating: the same tank as a compact bitcoin boiler for hot water, radiant floors, or a furnace coil, on a dedicated 30A, 240V circuit.