Domakihub Install a Pool Heat Pump: Step-by-Step Guide
Everything you need to place, pipe, and power a pool heat pump correctly the first time.
Reviewed by Domakihub pool pros · 2026-06-23 · 5 min read
A pool heat pump is one of the most cost-effective ways to extend your swimming season in Greece, where outdoor temperatures stay mild enough for heat pumps to run efficiently from early spring through late autumn. The video above walks through a real installation from start to finish; this article breaks the same process into five clear steps, adds Greek-climate context, and flags the details that matter most for holiday rentals and hotels where reliability is non-negotiable. Follow both together and you will have a solid foundation before your installer arrives — or before you pick up a wrench yourself.
Why a Heat Pump Rather Than a Gas Heater?
Heat pumps do not burn fuel — they move heat from the surrounding air into the water, achieving a coefficient of performance (COP) of 5 to 7 on a warm day. That means every 1 kWh of electricity delivers 5 to 7 kWh of heat, making running costs dramatically lower than gas or electric-resistance heaters. In Greece, where electricity tariffs for businesses and rentals can be managed with a time-of-use plan, this matters even more.
Modern inverter-driven units also ramp their output up and down continuously, so they maintain a steady pool temperature without the loud on/off cycling of older compressor designs — a meaningful advantage for hotel guests or rental tenants sleeping nearby.
What to Plan Before Installation Day
Site selection is the single decision that most affects long-term performance. The heat pump must receive a free flow of ambient air: manufacturers typically require at least 60 cm of clearance on all sides and 1.5 m above the fan outlet. Placing the unit against a wall in a narrow equipment bay forces it to recycle its own cold exhaust air and cuts efficiency sharply — a common mistake in tight pool-plant rooms across Greek villas.
You will also need to confirm the electrical supply (most residential units in Greece require a dedicated 3-phase or single-phase 230 V 16–32 A circuit with an earth-leakage breaker), and ensure the existing pool pump can maintain the minimum flow rate the heat pump manufacturer specifies — usually 8–12 m³/h. If your pool pump is undersized, address that first.
How to Install a Pool Heat Pump: 5 Steps
- 1
Choose and Prepare the Location
Set the heat pump on a solid, level concrete pad or anti-vibration feet at least 60 cm clear of walls on all sides. The pad must handle the unit's weight (typically 60–120 kg) without settling or cracking, and it should sit slightly higher than the surrounding ground so rainwater drains away from the base. In coastal areas of Greece, position the unit with the fan outlet pointed away from the prevailing sea breeze to reduce salt-laden air cycling directly through the coil — this alone can significantly extend coil life.
- 2
Make the Plumbing Connections
Fit bypass valves (a three-valve bypass kit) on the return line so you can isolate and service the heat pump without draining the pool. Connect the heat pump inline on the return side — always after the filter and any chemical dosing equipment — so it receives clean, balanced water. Use rigid PVC pipe or flexible reinforced hose rated for pool chemicals; CPVC is preferred on the heat-pump ports themselves because it handles higher temperatures. Keep plumbing runs as short and straight as possible to minimize head loss, and insulate any outdoor pipework that might be exposed to cold nights.
- 3
Wire the Electrical Supply
Turn off the main breaker before beginning any electrical work. Run a dedicated cable from the distribution board to a weatherproof isolator switch mounted within sight of the heat pump, then from the isolator to the unit's terminal block following the wiring diagram in the manual. In Greece, all outdoor electrical installations must comply with ELOT EN 60364, and an RCD (residual-current device) of 30 mA is mandatory for poolside circuits. Unless you hold a licensed electrician qualification (ΔΕΗ-certified), this step should be completed by a registered professional — holiday rentals and hotels face licensing inspections where non-compliant wiring is a show-stopper.
- 4
Commission and Test the System
Restore water flow first, then power. Check for leaks at every union and valve before switching the heat pump on. Set the target temperature (28–29 °C is typical for a Greek holiday-rental pool), let the unit run for 10 to 15 minutes, and confirm that the outlet water temperature is measurably higher than the inlet — a difference of 2–4 °C at rated flow is normal. Listen for rattles or abnormal compressor noise, check that the fan spins freely, and verify that the defrost mode (if fitted) cycles correctly on cooler mornings below 15 °C.
- 5
Set Up Controls and Maintenance Schedule
Most modern heat pumps offer a timer or Wi-Fi controller: schedule operation during off-peak electricity hours (typically 23:00–07:00 under Greek time-of-use tariffs) and overlap with the pool pump's filtration cycle. After installation, clean the evaporator coil fins every three months with a soft brush or low-pressure rinse to remove dust, pollen, and salt. Check refrigerant pressure annually via a qualified F-Gas technician — in the EU this is a legal requirement for systems charged with more than 5 tonnes CO₂ equivalent of refrigerant. Log each service visit: rental operators in Greece must demonstrate maintenance records during EOT inspections.
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FAQ
- How long does it take to install a pool heat pump?
- A straightforward installation — pad already in place, plumbing accessible, electrical circuit ready — typically takes a plumber and electrician working together around four to six hours. If a concrete pad needs to be poured or pipework rerouted through an equipment room, allow a second day for the concrete to cure before placing the unit.
- Can I install a pool heat pump myself in Greece?
- The plumbing side (bypass valves, pipe connections) is within reach of a competent DIY installer, but the electrical connection requires a licensed electrician under Greek law, and refrigerant work must be carried out by an EU F-Gas certified technician. For EOT-licensed holiday rentals and hotels, any unlicensed electrical work can invalidate the operating licence, so it is strongly advisable to use qualified trades throughout.
- What size heat pump do I need for a typical Greek villa pool?
- A common rule of thumb is 1 kW of heating capacity per 10 m³ of pool volume, but Greek summer conditions (ambient air often above 25 °C) allow manufacturers' rated outputs to be achieved easily, so you can size toward the lower end. A 45 m³ villa pool (roughly 9 m × 5 m × 1 m) typically needs a 10–14 kW unit. For hotel or rental pools with heavier bather loads or a pool cover requirement during cooler months, add 20–30% to that figure.