PizzAxe - Bitcoin mining pizza bag warmer by PizzAndy

PizzAndy · September 12, 2026, 6:39pm

Meet the PizzAxe: a portable pizza bag warmer heated by a Bitaxe 801 Gamma Turbo.

Description:

This project is an extension of an idea I’ve had for 10 years: a heated pizza bag that monitors and controls temperature and humidity to keep pizza as fresh as possible during transport. The controls will have to come later. For now, this is the extra-fun part!

The inspiration came from a side chat with other Heatpunks about making a “nice” ShitAxe. I thought, “My ass is plenty hot. My pizza needs warmth!” And the PizzAxe was born. Maybe keep your eyes peeled for a “Nice ShitAxe” someday.

The PizzAxe rides in the car, runs off the 12 V cigarette lighter outlet, and uses a phone hotspot to keep the Bitaxe online. I also added a voltage regulator rated for a 9–36 V input to help keep the supply steady as the car’s voltage varies, and spikes when starting.

The Bitaxe is water-cooled, and the coolant carries its waste heat through approximately 17 feet of ¼-inch aluminum tubing beneath the pizza. A thin aluminum sheet spreads that heat across the bottom of the bag. The coolant then passes through a radiator, where a Bitaxe-controlled fan blows warm air into the bag, delivering additional heat to the interior.

The coolant loop is straightforward:

Reservoir → Y-Joint → pump → Bitaxe cooling block → floor coil → radiator → Y-Joint

Loose BOM:

Bitaxe GT 801 - Chosen for being 12V and in the 40-90watt power consumption territory.
1. Fan reused on Radiator with adapter
2. Screen moved to side of enclosure
Generic 40x80mm water block
12V pump
1/4" Aluminum tube fuel line with compression fittings
Generic 80mm Radiator
Motorcycle brake fluid reservoir
Silicone tubing, mostly 1/4", pump inlet was 14mm.
50mm fan scavenged from Canaan Nano 3s - this cools the VRMs and the pump
Voltage Regulator 9–36 V input
Voltage distribution block
12V Cigarette outlet plug
3D Printed parts, hardware

Results:

I’m still playing with the settings, but I’ve successfully overclocked it to ~4.1 TH/s at 74 W reported by AxeOS (82W at the benchtop PSU), with some cooling headroom left in the radiator. Putting those chips to work keeping my pizza warm! I’ll have to test more to find the ideal pizza conditions. So far I was measuring a max 40C at the floor with the chips at 65C with the radiator fan off.

Is this practical? Absolutely not! Much like me, it’s completely ridiculous, but it’s fun!

It exists for internet points, and to accompany me on my pizza tour to and from Columbus/Philly for Midwest Bitcoin Summit, and 3D Printopia, respectively.

Unsure how much more I will develop this, but controls would be a good addition. If I’m feeling real motivated, this might be a fun Mujina project for targeting heat output instead of maximizing hashrate. The latest AxeOS seems to cap the target chip temp at 66, and I’d like to push that higher too.