This startup is recycling energy to heat swimming pools for free

A Deep Green cloud data center in action.
(Image credit: Deep Green)

UK startup Deep Green has announced its use of  “UK-first” “digital boiler” technology to heat businesses with “consistent heat needs” for free - including swimming pools, apartment blocks, distilleries, laundrettes, and bakeries.

Simply put, the technology is a cloud data center submerged in mineral oil that transforms surplus heat from its servers into hot water. 

In the case of the first pilot site, Exmouth Leisure Centre in Devon, Deep Green’s contributions will reduce the gas requirements of its swimming pool by 62%. Carbon emissions are set to be reduced by 25.8 tonnes and the business could save around £20,000 a year.

The cost of data centers

The economic downturn continues to threaten businesses reliant on heavy energy consumption. An estimated 79% of the UK's 1,500-plus swimming pools face closure, thanks to energy costs rising by 150% since 2019, and Mark Bjornsgaard, CEO of Deep Green, knows things need to change.

"Data is critical to modern society and demand for data centers is growing exponentially,” Bjornsgaard said. “However, this comes at a cost. Current data center infrastructure is inefficient, using a huge amount of energy and generating a vast amount of waste heat.”

To this end, “around 96%” of the heat generated by a Deep Green digital boiler is recycled. 

"Pools are just the start, and around 30% of all industrial and commercial heat needs could be provided by this technology,” the CEO added. 

Peter Gilpin, CEO of LED Community Leisure, the operator of Exmouth Leisure Centre, is equally convinced by the move. He claims the site is already seeing the benefit of a “dramatic” reduction in energy bills, and believes the technology could transform the UK’s leisure industry in the long-term.

Beyond Exmouth, Deep Green hopes to open installations in Bristol and Manchester in the next few weeks.

It’s worth noting that, while “digital boilers” may be a “UK-first” for businesses, others have already brought the technology into the home. In February 2023, TechRadar Pro reported that green distributed compute network Heata was using similar technology to provide free hot water to homes in South East England. 

We said it then and we’ll say it now: businesses can use ‘innovation’ to mitigate the cost of living crisis, but it won’t address the root causes, and it won’t entirely solve the broader issues at play.

Luke Hughes
Staff Writer

 Luke Hughes holds the role of Staff Writer at TechRadar Pro, producing news, features and deals content across topics ranging from computing to cloud services, cybersecurity, data privacy and business software.

Read more
Heata compute powered water heater
A data center in every home! Energy company wants to heat your water for (almost) free but there's a catch
A person standing in front of a rack of servers inside a data center
Data centers are transforming waste heat into community energy assets
Data center racks with cables and servers
What data centers should consider to establish more sustainable operations
Closed loop liquid cooling system
Did extreme overclockers inspire Microsoft to develop closed loop liquid cooling for data centers? I'd like to think so
A person standing in front of a rack of servers inside a data center
Direct-to-chip, single-phase and dual-phase cooling explained
Racks of servers inside a data center.
Modernizing data centers: an efficient path forward
Latest in Pro
Google DeepMind panel discussion
“More sovereignty and protection” - Google goes all-in on UK AI with data residency, upskilling projects, and startup investments
A graphic showing someone on a tablet working through a supply chain.
Security issue in open source software leaves businesses concerned for systems
European Union technical background
EU tech companies push for digital sovereignty, reducing reliance on US and others
ransomware avast
One of the most powerful ransomware hacks around has been cracked using some serious GPU power
person at a computer
Infamous ransomware hackers reveal new tool to brute-force VPNs
Adobe Summit 2025
Adobe Summit 2025 - all the news and updates as it happens
Latest in News
Panos Panay and Alexa Plus
Amazon's Panos Panay teases future Alexa+ devices from speakers to possible wearables
Metroid Prime 4
I reckon the Nintendo Switch 2 could launch with Metroid Prime 4 – here’s why
Samsung Galaxy Z Fold 6
New rumors predict a foldable iPhone will launch next year – and cost almost twice as much as the iPhone 16 Pro Max
Pebble smartwatch countdown
Pebble confirms its smartwatch announcement is just hours away
Logo of YouTube Shorts
Is YouTube auto-playing Shorts when you open the app? Well, you’re not alone - here’s how to fix it
Google DeepMind panel discussion
“More sovereignty and protection” - Google goes all-in on UK AI with data residency, upskilling projects, and startup investments