March 31, 2026
Hot takes, hotter water
Distributed data centers in our basements
Hot showers from server racks? HN can’t stop arguing
TLDR: A viral HN post suggests basement servers that double as home heaters. Commenters split between dreamers citing real projects and savings, and skeptics warning about noise, power bills, reliability, and security—turning waste heat into house heat sounds clever, but scaling it beyond homelabs is the real fight.
What if the cloud lived in your basement and heated your shower? An Ask HN threw that spicy idea into the feed: mini servers in basements that warm your water and floors while doing real work. The thread instantly lit up with hot takes hotter than the boilers.
The skeptics came in loud. One commenter sniffed, “Noble maybe, but it’s widely unrealistic,” pointing to screaming fans, sky-high home power bills, and messy headaches like insurance, data protection, and internet outages. Others warned about reliability and SLAs—those “we promise to stay online” uptime guarantees—saying basement boxes won’t meet pro standards. Security folks piled on too: as bognition asked, how do you run other people’s code on a machine you don’t control? Zero‑trust (systems that don’t require trusting the owner) isn’t plug-and-play.
But the believers brought receipts. Someone dropped a BBC link about a “data centre in a shed” that cut energy bills to £40. Another pointed at French projects like Hestiia and Qarnot turning computers into household radiators, plus Paris data centers piping heat into a city network. Then the meme bomb: a homelabber bragged, “I have better uptime than AWS,” turning the thread into a popcorn moment. Meanwhile, the pragmatists rolled their eyes with “Why don’t we all have solar panels and small farms?” energy, calling it a charming, chaotic dream with a very noisy soundtrack.
Key Points
- •The post proposes half-rack servers in home basements to provide compute and repurpose waste heat for domestic heating.
- •French efforts include Hestiia (end-user computer-heater radiators) and Qarnot, which moved toward low‑carbon HPC after earlier heater products.
- •An Equinix data center near Paris feeds waste heat into the SMIREC district heating network, supplying buildings including an Olympic aquatic center.
- •Attempts in the UK reportedly faced physical, environmental control, and economic challenges.
- •Concerns raised include lack of household power redundancy, difficulty meeting data center SLAs, and vulnerabilities such as DDoS in a widely distributed model.