🛢️ Annual oil cost
10,000 kWh / 0.85 (efficiency) = 11,765 kWh gross. At €1.20/litre with 10.25 kWh/litre: 11,765 / 10.25 = 1,148 litres × €1.20 = ~€1,375/year.
Heat Pump Payback: How Many Years Until the Investment Pays Off?
"Is a heat pump worth it?" - The answer lies in the numbers. How much it costs, how much you save each year compared to oil and how many years it takes to get your money back.
Let's look at a real scenario for a 100 m² home in Athens - with and without subsidy.
1. The Comparison Scenario: Oil vs Heat Pump
We take a typical 100 m² home in Athens with annual heating demand of 10,000 kWh. Currently heated by an old oil boiler (85% efficiency). How much does heating cost?
♨️ Annual heat pump cost
10,000 kWh / 3.8 (COP) = 2,632 kWh electricity . At €0.15/kWh: 2,632 × 0.15 = ~€395/year. Annual saving: ~€980/year!
🧊 Free cooling
The heat pump also provides cooling (air conditioning) - something the boiler can't. If you currently pay €300-500/year for air conditioning, that money should be added to the savings, as the heat pump replaces it.
📊 Total savings
Heating: €980 + Cooling: ~€350 = ~€1,330/year less with a heat pump. That money goes into your pocket every year!
2. How Much Does a Heat Pump Cost?
The price depends on capacity, machine type (air-to-water, monobloc, split) and additional works (pipework, buffer tank, controls).
💰 Machine
Air-to-water heat pump 8-12 kW (ideal for 100 m²): €4,000 – 7,000 (depending on brand and COP). Inverter machines with COP > 4 cost more but save much more long-term.
🔧 Installation
Boiler removal, new pipework, buffer tank, electrical connection, controls: €2,000 – 4,000. If fan coils or underfloor heating already exist, cost is significantly reduced.
🏠 Total turnkey cost
Typically €6,000 – 11,000 for a 100 m² home. With "Exoikonomo" subsidy (65-75%), your share drops to €2,000 – 4,000 - less than you pay for oil in 2-3 years!
⚠️ Hidden costs
Don't forget: electrical upgrade (if three-phase power is needed), pipe insulation and possible hot water network upgrade. Always ask for a complete quote.
3. Payback Period (ROI)
The payback period is how many years it takes for annual savings to offset the investment cost.
📈 Without subsidy
Cost: €8,500. Annual savings: €1,330. Payback: 8,500 / 1,330 = ~6.4 years. After 6.4 years, every euro goes into your pocket.
📈 With "Exoikonomo" (65%)
Your share: €2,975. Annual savings: €1,330. Payback: 2,975 / 1,330 = ~2.2 years! The subsidy dramatically reduces payback time.
📈 With "Exoikonomo" (75%)
Your share: €2,125. Annual savings: €1,330. Payback: 2,125 / 1,330 = ~1.6 years! In just 19 months you start making money.
🔋 20+ year lifespan
A heat pump lasts 20-25 years. If payback is 2-6 years, that means 15-23 years of pure profit! With €1,330 annual savings, that's €20,000 – 30,000 over the machine's lifetime.
4. Summary: The Heat Pump Pays for Itself
The numbers don't lie: even without subsidy , a heat pump pays for itself in 5-7 years. With "Exoikonomo", in just 2 years.
✅ When it's 100% worth it
If you currently pay over €1,000/year for oil and want air conditioning, the heat pump replaces both - payback becomes faster.
⚠️ When caution is needed
If the house isn't insulated, the heat pump will draw a lot of electricity. Insulate first, then install the heat pump. Otherwise the electricity bill will disappoint.
💡 The right calculation
Don't just compare machine prices. Look at: (1) annual heating cost, (2) payback period, (3) lifetime profit. The heat pump wins on every metric.
📞 Calculate your payback
Every home is different. Send us your square metres, heating type and annual bill and we'll calculate your payback for free.
📊 A heat pump isn't an "expense" - it's an investment that pays for itself in 2-6 years and earns €20,000+ over its lifetime!
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Heating Cost Comparison: Oil, Gas, Pellet or Heat Pump? Exoikonomo & Anakainizo: HVAC Subsidy Guide & Common Traps Life Cycle Costing (LCC): Why the 'Cheap' AC Turns Out Expensive Dynamic Tariffs & Smart HVAC: How to Pay Less for Electricity
Energy Design, Studies & Legislation
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