Equipment installed on this project
Dual Climer 320L system installed by our team in Calahonda. Professional workmanship with full warranty.
Calahonda Villa: Electric Boiler to Dual Aerotermia Upgrade
Case Study: 2 x 160L Climer Heat Pump Water Heaters Replace Inefficient Electric System
60%
Energy Savings
70%
Less CO₂
320L
Total Capacity
COP 3.0+
Efficiency
Location
Calahonda, Mijas Costa, Costa del Sol
Property Type
Private Villa
Previous System
Electric water heater
New System
2 x 160L Climer Aerotermia Units
Total Capacity
320 litres
Installation Date
January 2026
The Challenge
The villa owner contacted Agua Therm seeking advice on replacing their ageing electric water heater. Key concerns included:
Our Recommendation: Dual Aerotermia System
After assessing the property's hot water demands and existing infrastructure, our HVAC experts recommended installing two 160-litre Climer aerotermia (heat pump water heater) units. Here's why:
320L Total Capacity
Dual units ensure continuous hot water for multiple bathrooms simultaneously
Redundancy
If one unit requires maintenance, the second continues providing hot water
COP 3.0+ Efficiency
Each unit produces 3kW of heat for every 1kW of electricity consumed
Compact Installation
Units fit in existing utility space with proper ventilation
Running Costs Comparison
Based on typical Costa del Sol usage patterns and current electricity rates (2026):
Calculations assume: 4-person household, 200L hot water/day, PVPC tariff averaging €0.15/kWh, Costa del Sol ambient temperatures.
| System | kWh/month | Cost/month | Annual Cost |
|---|---|---|---|
| Electric Water Heater (old system) | 280 kWh | €42 | €504 |
| Climer Dual Aerotermia (new) | 93 kWh | €14 | €168 |
€28
Monthly Savings
€336
Annual Savings
67%
Reduction
Investment recovered in 5-6 years through energy savings alone
Energy consumption estimates based on COP 3.0 efficiency. Actual savings may vary based on usage patterns and electricity tariff. IDAE
For a villa with multiple bathrooms like this one, a dual aerotermia system is by far the best option. You get the hot water capacity you need without the massive electricity bills of a traditional electric heater. The redundancy is a real bonus too - if one unit ever needs servicing, you're not left without hot water. With a COP of 3.0 or better, these units extract most of their energy from the ambient air, which means the homeowner is essentially getting 75% of their hot water heating for free. It's a no-brainer for the Costa del Sol climate.
Rob Greeves
HVAC Director, Agua Therm
Electrical Integration & Energy Savings
This aerotermia installation is a superior choice for several reasons. The electrical requirements are straightforward - these units draw minimal power compared to traditional electric water heaters, which means lower running costs from day one. But here's where it gets really interesting: this system is perfectly positioned to integrate with solar PV and battery storage. During peak sunlight hours, your solar panels can power the heat pump directly, heating your water for essentially free. Add a battery system and you can time-shift that solar energy, running the aerotermia during off-peak tariff periods or when your batteries are full. For Costa del Sol properties, combining aerotermia with solar and battery backup isn't just smart - it's the path to near-zero energy bills for hot water.
Craig Whitham
Electrical Director, Agua Therm
Installation Gallery
Dual Climer 160L System
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Expansion vessel installed
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Professional connections
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External ventilation
Verified Efficiency Data
The performance claims for aerotermia systems are backed by official Spanish and European sources:
COP 3.0 = 300% efficiency
For every 1kW of electricity, the heat pump produces 3kW of heat
75% of energy from ambient air
Three-quarters of the energy used comes free from the surrounding air
Up to 60% energy bill savings
Compared to traditional electric or gas heating systems
70% reduction in CO₂ emissions
Versus conventional gas boilers
4x more efficient than oil/gas boilers
Heat pumps multiply energy efficiency compared to combustion systems
Aerotermia is classified as renewable energy under EU Directive 2009/28/EC. Source: IDAE (Instituto para la Diversificación y Ahorro de la Energía)IDAE
Professional Installation
Our certified technicians completed the installation with attention to detail:
Expected Results
Up to 60%
Energy Savings
70%
CO₂ Reduction
320L
Hot Water Capacity
COP 3.0+
Efficiency Rating
Client testimonial coming soon. We're following up with the homeowner to share their experience with the new aerotermia system.
Check back for an update on this project's real-world performance.
Frequently Asked Questions
Project Location
Sitio de Calahonda, 29649 Mijas Costa, Málaga, Spain
Related Resources
Also see
About the Author
Ben Hayden
English-Speaking Electrician & Independent Energy Advisor
Ben Hayden is an English speaking electrician and independent energy advisor based in Marbella, Spain, with over 15 years of electrical experience across Europe. He provides independent energy and electrical checks for overseas property owners and managers across the Costa del Sol — helping clients cut electricity bills, navigate Spanish regulations, and make confident decisions on solar PV, heat pump, EV charger and battery storage projects.
Ben advises in plain English on projects where the paperwork is in Spanish and the stakes are high. His writing has appeared in ExpatArrivals, The Olive Press, Euro Weekly News, BuildingTalk and pv magazine.