Bitcoin Heat-Reuse Deployment Registry: Real Projects, Graded by Evidence

Search “bitcoin heat reuse” and you’ll drown in headlines: whole cities heated by mining, 80,000 residents warmed, greenhouses blooming on ASIC exhaust. Some of it is real and some is press-release theatre, and the difference matters if you’re about to spend money. This registry catalogs the actual deployments — pools, district loops, drying kilns, home heaters — and grades each one measured, reported, or PR-only, so you can tell a metered result from a marketing claim. It also names the two headline traps up front, and keeps our own heater line to the same neutral standard as everyone else’s.

The one constraint that decides everything: temperature

Bitcoin miners produce enormous quantities of low-grade heat, and that single fact explains which reuse cases work and which are fantasy. Air-cooled ASICs — the S9, S19 and virtually every home heater — exhaust air at roughly 35–45 °C. That is genuinely excellent for warming a room, keeping a greenhouse frost-free, or force-drying timber, and it is completely useless for anything that needs steam or high-grade process heat. Immersion and hydro-cooling rigs do better, delivering liquid at about 60–75 °C, which is why the strongest commercial cases are pools and spas (a spa’s ~40 °C water is a textbook match) and district-heating preheat. But even the district projects lean on heat pumps to finish the job: in Finland the mining loop reaches only 25–35 °C, and heat pumps lift it to the 80 °C the grid actually distributes. Bitcoin heat substitutes for a furnace. It does not replace an industrial boiler.

Two headlines to distrust

First: “whole city heated by bitcoin.” The North Vancouver and Finland projects are real and worth celebrating, but the eye-catching numbers — 6,500 homes, 80,000 residents — describe the entire conventional district network’s population, not the slice that bitcoin heat actually covers (in North Vancouver, the deal targets around 100 buildings). Mining preheats water that a much larger heat-pump-and-gas system finishes. Second: any consumer heater sold as “pays for itself.” Independent reviews of the Heatbit and similar units are blunt — the BTC earned is a small rebate, and whether the whole thing is economic depends entirely on your local electricity price. At high rates the mining income is negligible; the honest pitch is “an electric heater that also earns a little Bitcoin,” not an investment. We hold our own Bitcoin space heaters to exactly that standard.

Where Canada fits

Canada is unusually well-suited to heat reuse: long cold winters mean sustained heat demand that would otherwise burn gas or electricity, and provinces like BC and Quebec pair that with cheap low-carbon power. MintGreen’s North Vancouver district loop and Vancouver Island distillery are the leading Canadian examples, and Quebec’s climate underpins D-Central’s own heater workshop in Laval. The honest caveat cuts both ways, though — Quebec’s move to restrict large mining loads on Hydro-Québec works against district-scale in-province heat reuse even as small residential heater use stays unaffected. Model your own numbers with the ASIC heat-reuse calculator, compare the residential options in the Bitcoin heater buyer’s guide, and explore the full landscape at the heat-reuse hub. The pattern across every credible deployment is the same: heat reuse pays when you already needed the heat.