Heatbit Maxi Pro review: A space heater that also mines Bitcoin

But once you set up your device, Heatbit will track your mining revenue and save it on your phone, even if you don’t have a Bitcoin wallet set up yet. After you reach the minimum transfer of 100,000 satoshis, or one-thousandth of one bitcoin ($66 in April 2026 prices), you transfer this to your wallet, and are supposed to spend it. Heatbit is compatible with Lightning Networks and most major exchanges (Coinbase, Binance, OKX, BitFinex).

Unlike many air purifiers that only activate when there are air quality problems, the Heatbit constantly pushes air through its HEPA filter while the mine and heater are active. While Heatbit recommends replacing the filter once every six months, in practice, the app showed the filter was being used about 1 percent per day. For whatever reason, my Heatbit app refused to believe I wasn’t in Seattle, so my outdoor air quality readings were all tied to King County, Washington.

Early quibbles aside, onramp’s ease of use is impressive for a device not aimed at crypto-loving engineers. At current prices, if I ran my heater/miner nonstop, that would get me about $70 off my heating bills once every couple of months. Cool, isn’t it?

Why not do the math on a Heatbit in pencil

Heatbit via Matthew Korfhage

But here’s the problem with that math. I’ll also need to put down at least $1,500 upfront (the current discounted price for the Maxi Pro) before I can access these savings. That’s about $1,350 more than the best space heaters I’ve tested. It also costs about $900 or $1,000 more than a Dyson purifier and heater. Therefore, your money-saving calculations should take this initial cost into account.

At this rate, assuming energy costs and Bitcoin prices remain constant, it would take five to eight years to “make my money back” in Bitcoin if I ran this thing 24/7 for four months a year. And this is on a device with a one-year warranty. (Heatbit’s founders say there was only a failure rate in the “low single digits” after three years for the first generation Heatbit Trio.)

These numbers assume that I will be running the space heater non-stop at full power for several months in a row as my primary source of heat — which is not how most people use space heaters. I tend to turn the heater on only when I’m in the room, and direct it toward myself. To heat an entire home, natural gas or a heat pump are more cost-effective options, if available.

But suppose you only have electricity for heat. It will always turn on the space heater. Let’s assume that the Heatbit continues to operate at the same efficiency for at least five years. Is Heatbit now the best economical choice? Well, still probably not.

Every cryptocurrency miner is a heater

Every cryptocurrency mining device will heat your home, whether its makers advertise it as a space heater or not. Each miner will release heat with up to 100% efficiency, depending on the amount of energy it uses. This is because, one way or another, all the wasted energy will eventually be converted into heat.

The most efficient composite space heater and Bitcoin miner will always be the one that mines Bitcoin most efficiently. At that point, you could just buy the Canaan Avalon Q ($1,900) and get a 50 percent better hashrate and produce roughly the same amount of heat. New ASIC miners may provide you with better efficiency. Almost anything you use, with the same amount of energy, will give off that amount of heat.