Why a Pool Heat Pump?
Without heating, most swimming pools in Portugal are only comfortable from June to September — barely four months. A pool heat pump can extend that to eight months or more, and in the Algarve, year-round swimming is entirely realistic. For expats who have invested in a villa with a pool, it makes sense to maximise its use.
A pool heat pump works by extracting heat from the ambient air and transferring it to the pool water. Because it moves heat rather than generating it, a pool heat pump delivers 4–6 units of heat for every unit of electricity consumed. This makes it 5–8 times cheaper to run than a gas pool heater.
Pool Heat Pump Sizing Guide
Correct sizing is essential. An undersized heat pump will struggle to maintain temperature; an oversized one wastes money. Here’s a general guide for Portugal:
| Pool Volume | Recommended Heat Pump | Typical Installed Cost |
|---|---|---|
| 20–30 m³ (small pool) | 8–12 kW | €2,000 – €3,500 |
| 30–50 m³ (medium pool) | 12–18 kW | €3,000 – €5,000 |
| 50–80 m³ (large pool) | 18–25 kW | €4,500 – €7,000 |
| 80–120 m³ (very large pool) | 25–40 kW | €6,000 – €10,000 |
These figures assume use in the Algarve or central Portugal. Cooler regions or year-round use may require a slightly larger unit. Our technicians will calculate the exact requirement based on your pool volume, desired temperature, location and whether you use a pool cover.
Running Costs: What to Expect
Running costs depend on pool size, desired temperature, location and season. Here are typical figures for a 40 m³ pool in Portugal:
- Algarve (April–October): €1.00–€2.50 per day
- Algarve (November–March): €3.00–€5.00 per day
- Lisbon area (April–October): €1.50–€3.00 per day
- Silver Coast (April–October): €2.00–€4.00 per day
By comparison, a gas pool heater for the same pool would cost €15–€25 per day. The savings are dramatic.
The Pool Cover Factor
A thermal pool cover is the single most effective way to reduce heating costs. A covered pool loses up to 70% less heat overnight compared to an uncovered one. We strongly recommend using a cover alongside your heat pump — it can reduce running costs by half and allow you to use a smaller (cheaper) heat pump unit.
Have a Pool? Get a Free Sizing Assessment
Tell us your pool dimensions and location, and we’ll recommend the right heat pump. Free, no-obligation quote.
Get Free QuoteInstallation: What’s Involved
Pool heat pump installation is typically straightforward and can be completed in 1–2 days:
- Positioning: The heat pump unit is placed near the pool pump house or filtration system, on a level concrete pad. Good airflow around the unit is essential for performance.
- Plumbing connection: The heat pump is connected to the pool’s existing filtration circuit. Water flows from the filter, through the heat pump, and back to the pool.
- Electrical connection: A dedicated electrical supply (typically single-phase for units up to 20 kW, three-phase for larger units) is connected by a certified electrician.
- Commissioning: The technician programmes the thermostat, checks water flow, and verifies the system is operating correctly.
Holiday Lets: The Business Case
If you rent your Portuguese villa, a heated pool is a powerful marketing tool:
- Extended season: Guests can book with confidence from March to November, not just peak summer.
- Higher rates: A heated pool justifies premium pricing, typically adding €200–€500 per week.
- Better reviews: “Lovely warm pool” is one of the most common positive comments in holiday rental reviews.
- Competitive edge: In a crowded rental market, a heated pool helps your listing stand out.
Frequently Asked Questions
How long does it take to heat a pool from cold?
For a 40 m³ pool with a 15 kW heat pump, expect 24–48 hours to raise the temperature by 10°C from cold (e.g., 16°C to 26°C). Once at temperature, the heat pump only needs to run a few hours per day to maintain it.
Can I use a pool heat pump year-round in Portugal?
In the Algarve, yes — winter air temperatures are sufficient for a heat pump to maintain a comfortable pool temperature. Further north, it’s possible but less practical (and more expensive) during December and January.
How noisy are pool heat pumps?
Modern pool heat pumps operate at 40–55 dB at one metre distance — similar to a quiet conversation. With proper positioning away from bedroom windows and neighbouring properties, noise is rarely an issue.
What maintenance does a pool heat pump need?
Minimal: keep the air intake clear of leaves and debris, check the water chemistry is balanced (as you would for any pool), and have an annual professional service to check refrigerant levels and electrical connections.