Equipment installed on this project
Estepona: Johnson Inverter Pool Heat Pump Installation with New Electrical Feed
Case Study: Complete Pool Heating Solution with Dedicated Power Supply from Main Distribution Board
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Johnson JSP34YN with Wi-Fi Connect and R32 refrigerant
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Plant room with new dedicated electrical feed
Unit installed on level gravel base
The Challenge
The villa owners wanted to extend their swimming season in Estepona, enjoying their pool from early spring through late autumn. The main challenges included:
- No existing pool heating - water too cold for comfortable swimming outside peak summer
- Existing electrical infrastructure lacked capacity for a pool heat pump
- Pool plant room already housed filtration and chlorination equipment
- Need for energy-efficient solution to manage running costs
- Desire for remote monitoring and control capability
Our Recommendation: Johnson JSP34YN Inverter Pool Heat Pump
After assessing the pool volume, location, and the client's requirements, our HVAC specialists recommended the Johnson JSP34YN Inverter pool heat pump. Here's why this was the ideal choice:
Full Inverter Technology
Variable-speed compressor modulates output from 25% to 100%, matching power to actual heating demand for maximum efficiency
R32 Refrigerant
Next-generation refrigerant with 68% lower global warming potential than R410A, meeting EU F-Gas regulations
Wi-Fi Connect Built-In
Monitor and control pool temperature remotely via smartphone app - ideal for holiday home owners
Titanium Heat Exchanger
Corrosion-resistant titanium construction handles chlorinated and salt water without degradation
Critical Electrical Infrastructure Upgrade
A crucial element of this installation was providing adequate electrical supply. Pool heat pumps require significant power, and the existing pool equipment circuit was insufficient. Our qualified electricians completed:
- New dedicated cable run from the main distribution board to the pool plant room
- Correctly sized MCB protection installed at the distribution board
- Dedicated isolator switch installed adjacent to the heat pump for safe servicing
- Earth bonding connected to existing pool equipotential bonding system
- All work completed to Spanish REBT (Reglamento Electrotécnico de Baja Tensión) standards
Running a new electrical feed ensures the heat pump has clean, stable power without overloading existing circuits. This prevents nuisance trips and extends equipment life.
Verified Pool Heat Pump Efficiency Benefits
Inverter pool heat pumps deliver exceptional efficiency compared to traditional gas or electric resistance heating. These benefits are backed by authoritative sources:
COP up to 16.0 in optimal conditions
Coefficient of Performance (COP) measures heat output vs electrical input. A COP of 16 means 16kW of heat from 1kW of electricity - far exceeding gas boiler efficiency
Source: Department of Energy (USA)40-60% energy savings vs fixed-speed pumps
Inverter technology allows the compressor to run at partial load, consuming only the energy needed rather than cycling on/off at full power
Source: European Heat Pump AssociationExtended swimming season by 4-6 months
Maintain comfortable 26-28°C pool temperature from March to November on the Costa del Sol, compared to June-September without heating
Source: Energy Saving Trust (UK)R32 refrigerant: 68% lower GWP
R32 has a Global Warming Potential of 675 compared to 2088 for R410A, making it the environmentally responsible choice
Source: Daikin IndustriesPool heat pumps are recognized by the EU as renewable energy technology under the Renewable Energy Directive (RED II) when achieving Seasonal Performance Factor (SPF) above 2.5.
"The Johnson JSP34YN is an excellent choice for Estepona villa pools. The full inverter technology means it's not just efficient at full load - it's actually most efficient when running at 40-60% capacity, which is exactly where you want it on mild Costa del Sol days. The built-in Wi-Fi is a game-changer for holiday home owners who want to warm their pool before arrival. With the titanium heat exchanger, this unit handles salt chlorination systems without issue. For a typical 50m³ pool, clients can expect to maintain 27°C water temperature from March through November with very reasonable electricity costs - far cheaper than gas heating and infinitely more practical than trying to heat with solar alone."
Rob Greeves
HVAC Director, Agua Therm
"What many people don't realize is that the electrical work is often the most critical part of a pool heat pump installation. This Johnson unit draws up to 6.5kW at full capacity - you can't just plug that into an existing outdoor socket. We ran a new dedicated 6mm² cable from the main distribution board, which required careful routing and waterproof junction boxes. The existing pool plant room already had the filtration pump, chlorinator, and irrigation controller - adding another high-draw appliance to that circuit would have caused constant tripping. By providing a dedicated feed with its own MCB and RCD protection, we ensure reliable operation and full electrical safety. The earth bonding is equally important - we connected to the existing pool equipotential bonding system to prevent any stray voltage issues. This is exactly the kind of detail that separates professional installation from a DIY disaster."
Craig Whitham
Electrical Director, Agua Therm
Professional Installation Process
Our certified technicians completed the installation with meticulous attention to detail:
- 1Site survey to determine optimal heat pump position for airflow and noise considerations
- 2Prepared level gravel base to ensure proper drainage and vibration isolation
- 3Connected pool water circuit with correct flow direction and bypass valve
- 4Installed new electrical feed from main distribution board (approx. 25m cable run)
- 5Fitted dedicated isolation switch and RCD protection at plant room
- 6Configured Wi-Fi connection and registered client's smartphone app
- 7Commissioned system with full heating cycle test and flow rate verification
Installation Results
34kW
Heat Output
Full Inverter
Technology
R32 Eco
Refrigerant
Wi-Fi App
Control
Why Johnson Pool Heat Pumps?
Johnson has established a strong reputation in the Spanish pool heating market:
- European brand with full Spanish distribution and support network
- Comprehensive range from 8kW to 34kW covering all pool sizes
- Full inverter technology across the range - not just marketing claims
- 5-year compressor warranty demonstrates confidence in build quality
- Competitive pricing compared to premium brands like Zodiac or Hayward
Location: Estepona, Costa del Sol
Agua Therm provides professional pool heat pump installation throughout the Costa del Sol, including Estepona, Marbella, Benahavís, San Pedro, and Sotogrande.
Frequently Asked Questions
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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.