Hotta

hotta.es ↗ ·Soria ·Seed

Hotta (formerly Therminer) is a Spanish climate-tech/energy startup that builds modular edge data centres which double as heating systems: servers are integrated into 'computational boilers' that recover up to ~96% of the energy consumed as hot water and heating for hotels, residential buildings, heated pools, sports centres and wellness facilities, sold as a zero-upfront-investment energy service. Founded in 2021 by two engineers who started in a garage in a Soria village, it is at Seed stage and has raised a strategic round from corporate and VC backers including Domusa Teknik, MONDRAGON, Fluidra Ventures, Faraday Venture Partners and Soria Emprende; it was named one of Spain's 'Top 101' most innovative companies and is part of Santander X 100. It has a Valencia presence via Startup Valencia/UPV programmes.

Founded
2021
Founders
2
Total funds raised
—
Rounds
1
Investors
9
Last round
Feb 2026
SectorsEnergy & Climate, Cleantech, Data Centers, Proptech, Deeptech & Hardware Start-up MapEnergy & Climate › Residential energy transition

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Founders

Aarón Molina Galán
CTO & Co-Founder
Gonzalo García Iranzo
CEO & Co-Founder

Global models 5

Deep Green
United Kingdom · deepgreen.energy ↗
Installs small edge data centres at sites such as public swimming pools and gives them the servers' waste heat for free, which is Hotta's zero-upfront heat-as-a-service model.
$200M+Comparable
Qarnot
France · qarnot.com ↗
Builds computing heaters and boilers that run cloud and HPC workloads and supply the heat to buildings, earning money from compute while giving the heat to its hosts.
$45MComparable
Cloud&Heat
Offers liquid-cooled modular data centres designed to feed server waste heat into building heating and hot-water systems.
$25MComparable
Leafcloud
Netherlands · www.leafcloud.com ↗
Puts cloud servers in buildings such as apartment blocks and swimming pools, where their heat produces hot water for free, and sells the compute capacity as cloud services.
$10MComparable
Stimergy
Makes 'digital boilers' of immersion-cooled servers that preheat hot water for housing, pools and hotels at no cost to the host while selling the computing power.
$5MComparable

In the same niche 25 others

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Notes: Most funded first

Investors 9

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Funding rounds 1

DateRoundAmountLead
PublishedArticle
2026-02-23 Domusa Teknik and MONDRAGON invest in Hotta, transforming waste heat into comfort ↗
Capital-Riesgo.es
2026-02-23
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