Heating Swimming Pools with Bitcoin Mining

February 16, 2026 · 6 min read

Municipal swimming pools are expensive – especially due to heating costs. Keeping an outdoor pool at comfortable 24-26°C consumes enormous amounts of energy. What if you could simultaneously earn money while doing it?

The Cost Problem of Municipal Pools

A typical outdoor pool consumes for pool heating:

• 500-1,000 MWh heat per season
• €50,000-150,000 heating costs annually
• Usually gas or district heating

Many municipalities subsidize their pools with six-figure amounts. Rising energy prices exacerbate the problem.

Bitcoin Mining as Heat Source

Bitcoin miners convert 95% of electricity into heat. This heat can be used directly for pool heating:

Technical Implementation

There are two main approaches:

1. Air-cooled miners + heat exchanger

• Miners placed in container/technical room
• Hot exhaust air (60-70°C) passes through heat exchanger
• Heat transferred to heating water
• Pre-heating of pool water

2. Immersion-cooled miners

• Miners immersed in dielectric fluid (special oil)
• Oil absorbs heat, circulates through heat exchanger
• Higher efficiency, quieter operation
• Higher initial investment

Why Outdoor Pools Are Ideal

Outdoor pools have special advantages for mining:

• High heat demand: Large water volume needs lots of energy
• Low temperature: 24-26°C sufficient, no high temperature needed
• Seasonal operation: Highest demand in summer = highest PV production
• Large areas: Space for PV systems + mining containers

The Model: Sun → Mining → Pool

Particularly elegant: Combination with own PV system:

• PV on parking lot canopy or roof
• Surplus electricity goes to mining
• Mining heat heats the pool
• Bitcoin revenue reduces operating costs

The outdoor pool becomes a prosumer: it produces electricity, consumes it meaningfully, and generates income in the process.

International Examples

North Vancouver, Canada: The city uses mining waste heat for public buildings. The project has been running since 2022 and saves over 100,000 CAD annually in heating costs.

Mintgreen (Vancouver): Supplies 100 residential units with mining heat. Residents pay normal district heating prices.

Political Acceptance

The biggest resistance often comes from politics: "Bitcoin? That's speculation!" Here education helps:

• Municipality doesn't have to hold bitcoin – immediate sale possible
• It's about heat utilization, bitcoin is the byproduct
• Comparison: Heat pump with bonus revenue
• Climate neutral when using surplus electricity

Economics

For a medium-sized outdoor pool:

• Investment: €100,000-200,000 (mining hardware + installation)
• Annual savings: €50,000-80,000 heating costs
• Bitcoin revenue: €20,000-40,000/year
• Payback period: 1.5-3 years

Conclusion

Heating outdoor pools with Bitcoin mining isn't future music – it's already happening internationally. For German municipalities with tight budgets, this model could offer a win-win situation: Lower operating costs, new revenue stream, and an innovative image for the community.