Operating Costs Calculator

Calculate and compare the annual operating costs of heat pumps with other heating systems. Our tool uses real-world data from Fraunhofer ISE field studies and current energy prices to give you a transparent cost comparison.

Enter your specific values below or use our default assumptions based on typical German households.

Understanding Your Results

Your calculation shows the annual energy costs for heating your home. These numbers represent what you would pay each year based on the parameters you entered.

When heat pump costs are lower than gas, you’re looking at direct annual savings on your heating bills. These savings typically increase with higher system efficiency (SCOP/JAZ) and can be further enhanced by using self-generated solar power. Over the typical 20-year lifespan of a heating system, even modest annual savings compound into substantial financial benefits.

When heat pump costs appear higher, it’s worth checking whether you’ve entered realistic electricity prices. Our default values reflect current market prices for new customers, which may differ from your existing tariff. Remember that heat pump economics continue to improve as electricity prices stabilize and gas prices trend upward over time. Even if costs are currently similar, heat pumps offer greater price stability and independence from volatile fossil fuel markets.

This calculator focuses exclusively on operating costs—the energy you consume each year. Not included in these numbers are initial investment costs, installation expenses, potential building renovations, available subsidies, or maintenance requirements. For a complete financial picture that includes all these factors, we recommend reading our detailed article on heat pump economics.

Read the full analysis: Operating Costs – Heat Pump Beats Gas Already Today

How the Calculator Works

Default Values & Scientific Foundation

All default values in this calculator are based on typical, scientifically sound assumptions derived from extensive field research. The energy prices are updated weekly using data from the DIE ZEIT Energy Monitor and reflect current market rates for new customers. While these provide a solid starting point, you can adjust every parameter to match your specific situation.

The default efficiency value for air-to-water heat pumps comes from averaging thousands of real-world measurements collected during Fraunhofer ISE field tests conducted over more than two decades. Ground source heat pumps typically achieve even better performance, with seasonal coefficients of performance around 4.3 or higher. Higher efficiency translates directly into lower operating costs, which is why modern, well-installed systems deliver increasingly attractive economics.

For photovoltaic integration, the calculator starts with a conservative assumption of zero self-consumption. Households with solar installations should enter their expected share of self-consumed electricity. Without specific optimization measures, typical PV self-consumption for heat pump operation hovers around 20%, though this can be increased substantially with battery storage or smart control systems.

The heat demand values are calibrated to typical German building standards, but your actual consumption may vary based on insulation quality, building size, and heating behavior. Your energy bills provide the most accurate reference for this parameter.

Frequently Asked Questions

Why are the default electricity prices lower than what I pay?

Our default values reflect current market prices for new customers and are updated weekly to track market movements. If your electricity price is higher, it likely means you’re on an older tariff. Many providers offer more competitive rates for new customers or when switching contracts. Always enter your actual electricity price for personalized results, and consider shopping around for better tariffs—even small reductions in your electricity price can significantly improve heat pump economics.

My heat pump costs are higher than gas heating. Is this normal?

It depends entirely on your specific electricity and gas prices. Heat pump economics improve significantly with lower electricity prices, higher gas prices, better system efficiency, and self-generated solar power. If your calculation shows higher costs, consider checking whether more competitive electricity tariffs are available in your area. Remember that long-term price trends favor electricity over gas, and heat pumps offer much greater price stability since renewable electricity costs are less volatile than fossil fuel prices.

What efficiency value (SCOP/JAZ) should I use for my calculation?

Our default value is based on real-world field data and represents a conservative, achievable performance level for well-installed air-to-water systems. If you’re planning a new installation, your installer should be able to provide an expected performance figure based on your specific building and system design. For existing systems, measured performance data is most reliable. Conservative estimates for air-to-water systems range from 3.0 to 3.5, while modern or ground-source systems can reach 4.0 to 4.5 under good conditions.

Are maintenance costs included in these calculations?

No, the calculator shows only energy costs. Annual maintenance for heat pumps typically costs between €100 and €200, while gas boilers generally require €150 to €300 in annual servicing. Heat pumps often have lower maintenance costs over their lifetime since they have fewer moving parts and don’t involve combustion processes that require regular inspection and cleaning.

How much can I save by adding solar panels?

The savings depend on how much of your solar electricity you can use directly for heating. Typical self-consumption rates hover around 20%, which translates to roughly 10-15% reduction in your heat pump operating costs. With battery storage, you can increase self-consumption to 40-50%, potentially cutting costs by 20-30%. Enter your expected self-consumption percentage in the PV field to see the impact on your specific situation.

Can I rely on these cost projections for long-term planning?

No calculation can guarantee future costs since energy prices fluctuate and individual circumstances vary. However, our defaults are based on conservative, real-world data rather than optimistic assumptions. The projections provide a realistic baseline for comparison, though actual costs will depend on market developments, your specific usage patterns, system performance, and weather conditions. Heat pumps generally offer more predictable costs than fossil fuel systems since renewable electricity prices are more stable than gas or oil prices.

What about environmental impact and CO₂ emissions?

While this calculator focuses on financial costs, heat pumps typically reduce carbon emissions by 50-70% compared to gas heating, even with the current German electricity mix. With renewable electricity or your own PV system, emissions can be reduced by 90-100%. This environmental benefit comes alongside the financial savings, making heat pumps attractive from both economic and climate perspectives.

Learn More About Heat Pump Costs

These articles provide deeper analysis and additional perspectives on heat pump economics, installation costs, and real-world performance across different building types and conditions.

Still Have Questions?

Our comprehensive guide answers 18 of the most common questions about heat pump technology, costs, and performance.

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Last update of energy prices: 19.02.2026 | Source: DIE ZEIT Energy Monitor