this post was submitted on 15 Jan 2025
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Electricity generated heat from your servers is incredibly inefficient compared to a heat pump.
Yes, but im already using the computer for other things and it would be more inefficient to double up on heating sources. I can confirm from personal expirence a PC in a small room can sufficently act as climate control.
Conversely it's exactly as efficient as a resistive heater, which lots of people still use.
Interesting thought experiment - is a pc exactly as efficient as a resistive space heater? In a pc some tiny amount of electricity is converted to light and sound and kinetic energy instead of heat. But then again, don't those other forms of energy just eventually just turn back into heat again? Hmmm...
Yes, it all eventually becomes heat, though not all in the room. Some sound escapes, and some light goes through the window or whatever. Those losses are incredibly minor though.
What makes a big difference between a PC and something purpose built as a heater is generally how the air circulates the room. A space heater is going to project it out into the room, baseboard heaters will create a wide convection current. A PC on a desk in the corner will typically just blast hot air at one localised spot on the wall which isn't really ideal for dispersing it throughout the room.
What if I reverse the direction of my fans (in from the backside and out from the front) and point it to face the middle of the room?
You guys have your PCs’ backs to a wall? I’ve always put it away from the wall.
I would think actually more efficient because heat is the waste product not the expected product like a stand alone heater. Unless you are specifically running your PC at max just to create heat then just using your PC as intended and gaining "free" heat is a bonus.
You will certainly lose a couple of milliwatts if you have a WiFi antenna on your PC.
The rest will be turned into heat in your room, probably.
Thank you, this thought had occurred to me recently, and I was wondering if it was accurate.
No one is comparing efficiency of a PC as a heating device to a Heat Pump.
So I'm not sure why you felt the need to post this.
Because the usefulness of waste heat in the winter is no reason to intentionally run an inefficient server if a lower power option is available.
Some might think ( as has been posted in this thread by others), "I'll run superPI to heat my room."
This is true, but it's shocking how few people have heat pumps, especially in colder climates.
Still, it's also far less efficient than using a gas furnace (to the point that most people would actually burn more fossil fuels per Joule of heat from a resistive heater than from just burning the gas directly in a furnace).
Of course, if you're doing something useful with that energy, using the waste heat is an extra benefit. Like using waste heat from a power plant for district heating.
Not sure who's down voting you. You're right. There's Heat pumps that can move 5x more heat than the energy they use. While a PC only gives you max 1:1
I interpreted the sentiment from OP that it was just reframing the reality in either case: the server is going to run, and it's going to generate heat.
You can either frame that reality as "waste heat is being generated" or "my furnace doesn't have to work as hard"
The efficiency of a heat pump in part comes from the temperature of the heat source. For an air source heat pump it will be more efficient at higher outside temperatures and less efficient and lower outside temperatures, and at extreme temperatures may be less efficient than resistive heating
“Incredibly inefficient” is a bit of an exaggeration, heat pumps typically run at an efficiency of about 2, occasionally 3. It’s better but not by orders of magnitude. Not gonna make much of a difference at 500 watts.
Technically those are orders of magnitude. 2x or 3x efficiency compared to resistive heating is quite a bit. But in the scheme of getting actual heat into an actual home and real world energy costs it's not a huge difference
Order of magnitude is 10x, at least in the common usage of that expression.
Ah crud yeah you're right. Good catch