I actually wait for winter to rip DVDs for this reason.
this post was submitted on 08 Oct 2025
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Can't I just use one Raspberry Pi but run Java on it?
If the Pi melts, it won't be much use for heating, now will it?
I would run folding at home or seti to warm my room back in college. It was surprisingly effective when I kept the door closed.
That said, I don't particularly want someone else's server equipment in my home unless I get root too.
GPU server rentals (AI) "from home" have a payback of about 1 year from some utility supplies. Solar brings it down to well under 1 year, and works well with no utility export ever, and can support up to near constant 80%/amps power draw. Averaging 50 amps will look like a grow op.
A smallish 5000w server/utility room (same as electrical/battery room usually designed to be large enough for a boiler/furnace + hot water tanks, and a bit extra storage) will heat room well above 35C. A cheap(est) air source heat pump can make 85C water at 2+ COP, and normal 65C hot water at 4+ COP. Simple CPU/GPU watercooling systems that blow towards the air source heat pump can bring input air to 45C.
What "rentable home server" functions provide is allowing maximum solar to support an EV off grid, storing up hot water in fall for hydronic floor heating, and helping top it up on sunny winter days. Turning off the servers for the worst 2 solar months of the year. Using EV to reverse charge home in worst winter conditions a better option than a gasoline generator.
There are also (unfortunately tend to be expensive) stackable plastic water containers that can help create a warm water reservoir while cooling surrounding computer racks/servers and batteries if you keep them in same room. DIY bendable aluminum sheet water troughs is much cheaper and just needs a toilet mechanism to turn off refilling valve.
You definitely won’t regret chaining 500 Raspberry Pis together.
So that's where all the rPi's got to...
Lol, I misread that as Raspberry Pi 500, and thought to myself: it couldn't have been that hot.
I've often thought about this, if you're actually using the waste heat from a PC does that mean its basically 100% energy efficient?
This seems like a really cool idea, although I'm not quite sure what happens in the summer when all this compute power gets shut off
Yes, a computer heating system would be just as efficient as an electric wall heater at near 100% effective whereas heat pumps effectively ranges from 300% to 500%: for 1w used to operate the pump you will pump 3 to 5w of heat into your home.
Well sure, if the electricity is powering something you already need and the waste heat is beneficial, then awesome, I guess that's free heat. But it's actually pretty rare that people need to be using that much electricity for anything as consistently as you would need for heating a home. And if you don't actually need to be using that electricity, there's really no way around the fact that electric heating is really pretty expensive.
I guess if you are stuck with electric heating as your only option and a heat pump is out of your price range, then mining crypto could be a nice way to offset the cost of electric heating... But then the equipment costs would add up and you'd probably be better off with a heat pump anyway.
My gaming PC noticeably helps heat up one of the rooms in my place during Winter.
In the Summer, however, that's a downside rather than an upside.
if you’re actually using the waste heat from a PC does that mean its basically 100% energy efficient?
Yes, but there is a big caveat: Heat pumps are much greater than 100% electrically efficient.
No, that doesn't violate thermodynamics. We don't count any of the thermal energy input into the "source" side of the heat pump, but it ends up on the "sink" side anyway. We are only comparing electrical input to thermal output, and the thermal output is much greater than the electrical input: Heat pumps are much more electrically efficient at heating your home than any form of resistive heating, including the waste heat from your PC.
A mining rig might be able to exceed the economic efficiency of a heatpump, but we would need much more data to attempt that calculation.
I’m not knocking this idea, but it seems like a common misconception that all heating is just waste. A heat pump, for example, gives more heat per unit of energy than just the basic one to one of resistant heating.
True but I guess the idea with this is we're going to use servers anyway, might as well make use of the heat
It is solid logic, as long as you're only utilizing heat that would have been produced anyway, independent of whether it's used productively or not. It goes bad if you start justifying inefficient hardware for longer than you otherwise would have because of it.
100% efficient electric resistance heating (including computing) is somewhere around 1/5 to 1/3 as efficient as a heat pump. It's also not necessarily better than gas heating, although that's harder to directly compare.
But the heat pump doesn't compute in parallel to heating.
Oh wow I didn't know heatpumps were that much better
Yeah, depending on the heatpump, the outdoor temperature, and the target temperature, a heatpump can reach up to 5.5x heat output. That means for every 1 kWh of electricity you use to run the pump, the pump will output 5.5 kWh of heat energy.
if you’re actually using the waste heat from a PC does that mean its basically 100% energy efficient?
It is exactly as efficient as an electric heater, yes, but an electric heater is one of the least efficient ways to heat a home.
Most costly*
electric heating is very efficient in the sense that it converts almost 100% of the electric energy into heat. But electricity is expensive.
I think the implied point of comparison is (edit: e.g.,) heat pumps, which are effectively more than 100% efficient (as mentioned elsewhere in the thread), making ~100% efficiency relatively inefficient by comparison.
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Bitcoin bros actually did this at one point by making a space heater that was also a Bitcoin miner.
You get heat at similar energy efficiency to just running a regular space heater, but it pays back part of the energy bill with Bitcoin it mines. You could see how this could probably be adapted to other things, like what's mentioned in the article (distributed cloud compute).
The main issue is that space heaters and other in-home heat generation units are still infinitely less efficient than things like heat pumps in many circumstances, since those can reach over 100% efficiency since they only transfer heat, rather than having to generate it from scratch.
I'm not sure I'd say infinitely less efficient. It's a 5-6x difference, which is still very significant on the electric bill.
I dont need heating on weekends where i game a lot, so yeah this absolutely works. If your PC pulls 500W from the wall then its exactly like having a 500W space heater. Thats also why i play less compute intensive games during the summer or lock them to 60fps. Playing Palworld on 60 instead of 144Hz makes a roughly 100W difference for me.
its why i was jokingly saying back during covid winter, that at the time, while frowned upon, gpu mining is less wasteful than heaters. one heats a room something in return. the other intentionally wastes energy only to heat a room.
I thought the same thing, jjst in a different way:
If thr only thing electronics are 100% efficient at is producing heat, then why not think of a Raspberry Pi as a heater that just so happens to be able to do calculations as a byproduct, as opposed to heating elements which can't?
If thr only thing electronics are 100% efficient
Heat pumps are much more than 100% electrically efficient. They are around 300% electrically efficient.
Watt for watt, a heat pump sinks a lot more heat into your house than either a resistive heating element or a raspberry pi.
They did always say the Cloud is just someone else's computer.
The only difference is you might know the bloke. And that he might try scrapping the copper
Why not any gpu mining any coin?
That's how I heated my university dorm that only had a boiler for heating. Figured it was safer than a space heater and wouldn't require me to haul an additional object home every summer, plus funded my lavish college diet of ramen and "how many soda refills can I get with my 99 cent McDonald's cup'.
Built a script to monitor the rooms air temperature and throttle mining accordingly to ensure that the room stayed within a few degrees of what I wanted. Would start up automatically after a few minutes away from my machine and stop if I was using the machine.
Probably not worth it.
If you need heat, mining anything is free money.
Nothing is free. Your equipment depreciates, so you need to account for that. Might be worthwhile if you have solar panels, a battery and use dynamic pricing. So you can charge the battery with solar and when electricity costs next to nothing, so you can run the equipment for heating of the battery when you get home in the afternoon which is usually when electricity prices go up. But end of the day it’s cheaper to just burn gas or use a heat pump if you just want to heat your home. And the heat a GPU array generates is probably not enough. The more efficient the GPU is with mining the less heat it generates, so the heat output per dollar input goes down. Not to mention the cost of a single GPU or ASIC miner.
That's only true if we're comparing GPU mining to resistive heating. Both are equally efficient at converting electrical energy to heat: 100%.
The numbers don't look nearly as good when we compare GPU mining to a heat pump. Heat pumps utilize an additional, uncounted source of free energy (outdoor heat). Since we aren't counting that additional energy, the electrical efficiency of the heat pump is much greater than 100%.
If you don't have enough GPU power to meet your heating needs, there's a capital cost to get more (and depending on your existing setup, likely even more capital costs for other components to be able to run it in a separate system).
Not to mention electricity
It's all fun and games until it's summer
Idk my Intel based System 76 Lemur Pro does well in the Texas winter when the grid goes down.
If the grid goes down, how do you expect to power the Intel space heater?
Nice concept, but imho also a potential security threat, letting someone run something on your computer in your network.
Would need more technical details and by now I couldn't find it on their page
There's a next to zero percent chance this wouldn't run on its own network.
A dedicated network connection at each site in being installed, so householders don't have to worry about HeatHub eating all their broadband bandwidth, the company told us
TLDR
Ah, thanks
Only looked on their own site and couldn't anything about it
Ok, that sounds pretty cool
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