L7 heater – Pivotal Edition (3.5 GH/s, 1300 W)

The L7 heater Pivotal Edition turns necessary winter heat into useful Scrypt hashrate while remaining comfortable indoors. We start with an Antminer L7, convert it for room use, and downclock two hashboards for a smoother sound profile. Stock fans are replaced on both the miner and the PSU with quiet 120 mm units (ARCTIC P12 Max, or equivalent), airflow is guided by an internal air deflector that distributes intake evenly across both chains, and the APW12 receives the Pivotal modification so you can run on 110–120 V or 200–240 V. For firmware control and monitoring we use the latest Vnish firmware.

Power limit and safety: this build is engineered for ~3.5 GH/s at ~1300 W. Do not raise the power setpoint above 1300 W, even when plugged into 200–240 V. Beyond that threshold, fan capacity and heatsink headroom are insufficient to keep the hashboards in a safe temperature zone, which can shorten component life or trigger thermal faults. The Vnish power cap is pre-set accordingly.

Why choose the L7 heater for home mining

The L7 heater is about balance, not peak numbers. You get a predictable ~3.5 GH/s near ~1300 W, low-tone airflow, and fewer fan spikes. You warm the room while producing LTC/DOGE hashrate, replacing a plain electric heater with something that does double duty. Dual-voltage support means it fits your current outlet and remains compatible if you upgrade to a 200–240 V circuit later—still capped at 1300 W for thermal safety.

Firmware & control (Vnish)

We preload the latest Vnish and tune it for indoor duty: per-chain visibility, power-limit slider locked at 1300 W max, autotune, and watchdog/restart logic. Pick the 110–120 V profile for the quietest behavior or use 200–240 V for tighter wall efficiency at the same power cap. For official firmware documentation and updates, visit vnish.group. Set the target, choose your pool strategy (LTC/DOGE or auto-convert), and let it hold steady.

Acoustics & airflow

Silent-grade 120 mm fans on the miner and PSU reduce harsh high-frequency pitch, while the internal air deflector guides intake across both hashboards to keep temperatures even and cut sudden ramping. If you want to add or replace the deflector, link to our part here : Hashboard Airflow Inlet Divider.

Refurbish, clean, retest

Each unit is opened and serviced: dust removed from heatsinks and channels, connectors and harnesses inspected, paste/pads checked where appropriate, and the machine soak-tested under load. We only ship after it meets hashrate, thermal, and acoustic targets at the 1300 W ceiling. You receive a refurbished L7 heater that is clean, stable, and ready to plug in.

L7 heater specifications

• Algorithm: Scrypt (Litecoin/Dogecoin)
• Hashrate target: ~3.5 GH/s (±10%), profile-dependent
• Power draw: ~1300 W at wall (±10%)
• Max permitted power setpoint: 1300 W (do not exceed)
• Hashboards: 2 (downclocked for acoustics & stability)
• Input voltage: 110–120 V or 200–240 V AC, 50/60 Hz
• Networking: Ethernet (RJ45); optional external Wi-Fi adapter
• Cooling : ARCTIC P12 Max or equivalent
• Airflow aid: internal air deflector (Hashboard Airflow Inlet Divider)
• PSU: Pivotal 110–220 V mod
• Base platform: Antminer L7 with heater conversion & Pivotal PSU mod

Dual-voltage quick guide

• 110–120 V silent mode: lowest acoustic footprint for living areas.
• 200–240 V performance mode: slightly better wall efficiency at the same 1300 W cap.
• Important: the 1300 W ceiling applies on both voltages; do not raise power above this limit.

Setup & placement

Use circuits and cabling rated for continuous load and verify breaker/outlet specs. Keep intake and exhaust clear; treat it like any high-output space heater. Indoors only—away from liquids, dust, and flammables. On first run in a new location, monitor chain temps and adjust placement or target if needed. Soft furnishings and open airflow paths help absorb remaining fan tone.

What’s included

• Complete heater-converted assembly
• Pivotal-modified APW12 PSU with silent fan swap
• Quiet 120 mm fan set installed on the miner
• Quick-start instructions

Warranty & notes

D-Central provides a 90-day warranty on our conversion and tuning work. Modifying the base machine may affect the original manufacturer warranty. If you need help choosing profiles or placement, our support team will suggest practical settings so your L7 heater runs comfortably and consistently within the 1300 W safety envelope.

If you already pay for electric heat, let those watt-hours pull double duty—room comfort plus hashrate—backed by dual-voltage compatibility, quiet acoustics, Vnish control, and a clear 1300 W cap that keeps the hardware in a safe thermal zone.