Heat Pump Calculator
Calculate electricity consumption, annual heating cost, monthly cost and the effective heat cost of your heat pump.
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Use this heat pump calculator to estimate how much electricity your heat pump may consume per year and what annual and monthly heating costs may result. It is designed as a practical first-step tool for homeowners, builders and renovators who want to compare scenarios quickly.
Heat Pump Calculator: Estimate heat-pump consumption and running costs
Use the result as a scenario comparison, not only as a single number. For energy calculators, runtime, price assumptions, efficiency and seasonal effects usually drive the biggest differences.
How to use the result better
- Calculate one realistic and one efficient scenario.
- Compare monthly and annual values so small daily amounts are not underestimated.
- Check inputs against real tariff, consumption or device data.
Common mistake
The most common mistake is an overly optimistic usage profile: runtimes too short, prices too low or missing base costs.
What to check next
If the result is high, compare related calculators for electricity, heating, PV, heat pumps or CO₂ to find the biggest lever.
How exact is the result?
It is a solid estimate when inputs are realistic. Bills may differ because of tariff details, weather, usage and supplier factors.
Why calculate several scenarios?
Scenarios show which input has the strongest impact, and that is usually where optimization should start.
Next steps
Useful calculators to continue
After the result, related calculators help you understand costs, alternatives and next steps more clearly.
Related calculators
How to use the result well
Compare several scenarios: Change the key values and check how much the result changes.
Use related calculators: Decisions often become clearer when you also calculate costs, timeframes or alternatives.
How the result is calculated
Heat pump electricity consumption = annual heat demand ÷ seasonal performance factor
Variable electricity cost = electricity consumption × electricity price
Total annual heating cost = variable electricity cost + fixed fee + maintenance cost
Monthly cost = total annual heating cost ÷ 12
Heat cost per kWh = total annual heating cost ÷ annual heat demand
Worked example
Example: With an annual heat demand of 15,000 kWh, a seasonal performance factor of 3.5 and an electricity price of €0.30 per kWh, electricity consumption is about 4,286 kWh. Variable electricity cost is about €1,286. Adding a fixed annual fee of €120 and maintenance cost of €150 results in total annual heating cost of about €1,556, or roughly €130 per month.
What does this heat pump calculator calculate?
The calculator estimates yearly electricity use, variable electricity cost, total annual heating cost, monthly cost and effective heat cost per kWh. This helps you assess how economically a heat pump may operate under your assumptions.
Who is this calculator for?
It is useful for homeowners, builders, renovators and anyone comparing heat pumps with gas heating or other systems. It is especially helpful when you want to test different electricity prices, efficiency levels or building heat demands.
What does the seasonal performance factor mean?
The seasonal performance factor is a simplified measure of heat pump efficiency over a full year. For example, a value of 3.5 means that 1 kWh of electricity produces around 3.5 kWh of heat on average over the year. Higher values are usually better economically.
Which factors influence the cost most?
The key factors are building heat demand, heat pump efficiency, electricity price, system temperatures, planning quality, insulation level and user behavior. Domestic hot water, blocking times, storage tanks and hydraulic balancing can also matter.
How realistic are the results?
The figures are only intended as an initial estimate. Real consumption and cost depend on many additional variables such as climate, actual building standard, operating pattern, load profile and the quality of the installed system.
What to compare when reviewing heat pump scenarios
A realistic heat pump comparison should include more than electricity use alone. Flow temperature, insulation standard, system efficiency, local climate, hot water demand and the current heating system all influence real operating cost.
Why should fixed fees and maintenance be included?
Many rough estimates focus only on the electricity unit price. For a more realistic cost view, annual fixed fees and maintenance should also be considered. Especially at lower electricity use, these fixed cost elements can noticeably increase the effective heat price.
How to compare scenarios more effectively
It usually helps to test several combinations of heat demand, electricity price and SPF. That makes it easier to see whether efficiency, tariff structure or building demand is the main cost driver in your case. A cautious, realistic and optimistic scenario often gives the best overview.
Frequently asked questions
How much electricity does a heat pump use per year?
That mainly depends on the building's heat demand and the seasonal performance factor. Lower heat demand and higher efficiency usually reduce electricity consumption.
What is a good seasonal performance factor?
Higher values are generally better. Realistic values depend on the building, heating system, flow temperatures, heat source and system design.
How much does heating with a heat pump cost?
Heating cost mainly depends on electricity use and the electricity tariff. Fixed annual fees and maintenance cost may also play a role.
Is special heat pump electricity always cheaper?
Not necessarily. Special tariffs may help, but the real economics depend on the actual price, fixed fee, blocking times and system efficiency.
Does this calculator replace professional energy advice?
No. It is only intended for general information and initial guidance. For a reliable real-world decision, professional planning and advice are recommended.
Can I directly compare gas and heat pumps with this calculator?
Only partially. This calculator estimates heat pump cost. For a fair comparison, you should also use a gas consumption or heating cost calculator.
Why do fixed fees and maintenance matter?
Because they increase total cost even if electricity consumption looks efficient. Looking only at the electricity unit price often understates real annual heating cost.
What does heat cost per kWh tell me?
It shows the effective cost of one generated kilowatt-hour of heat under your assumptions. That makes it easier to compare different heat pump or heating scenarios.
Important information
This calculator provides simplified model values and does not replace professional energy advice, technical planning or an individual cost analysis.