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Carbon Surface Heating vs. Heat Pump – Economic Efficiency

Comparison of power consumption, investment costs, funding logic, and PV self-consumption – with a real reference case.

Focus: paid kWh/year Reference: detached house, very good standard PV: 10 kWp Hot water separate

Recommended if you already know the living space, building standard, and PV data (if applicable).

1) Reference Case

Object: Detached house, very good efficiency standard, 82 m² living space.
Usage: all rooms constantly 22 °C (24/7).
Hot water: external (instantaneous water heater), not included.
PV: 10 kWp installed.

Classification: With very low heating loads, the overall economic efficiency (investment + operation + PV + funding) often plays a greater role than a pure percentage discussion.

2) Comparison: Consumption, Costs, Funding, PV

Criterion Carbon Surface Heating Heat Pump
Power Consumption Space Heating 1,615 kWh/year (measured) ≈ 300–700 kWh/year (practical range)
Investment Costs ≈ €8,000 ≈ €30,000 (incl. underfloor heating/control/installation)
Additional Investment HP ≈ €22,000
Funding Logic Eligibility for funding possibly via building standard (overall concept) often directly eligible as an individual measure (depending on the program)
PV Self-Consumption tends to be higher tends to be lower
Maintenance & Complexity very low higher

Would you like to know what this means for your building? We create an individual economic efficiency analysis based on your key data.

Request Economic Efficiency Analysis

Note: This page is a building-specific example and does not replace individual planning or a binding funding review.

3) Amortization

Definition: Amortization period = Additional investment heat pump ÷ annual electricity cost savings (space heating only).

Additional investment in the example: ≈ €22,000 | Electricity price assumption: €0.35/kWh
Scenario Savings (kWh/year) Savings (€/year) Amortization
Without PV effect (kWh difference only) ≈ 1,015 ≈ €355 ≈ 62 years
With PV effect (typical grid electricity consumption) ≈ 410 ≈ €144 ≈ 153 years

The PV effect varies depending on the control strategy, load profile, and storage (if applicable).

4) Decision Support

  • Focus on paid kWh: The decisive factor is the actual electricity consumption billed.
  • Investment vs. Savings: In very efficient buildings, the absolute electricity savings are limited – the investment dominates.
  • PV Usage: Direct electricity can make good use of PV self-consumption.
  • Funding Logic: Eligibility for funding often results from the building standard (overall concept).
  • Complexity: Lower complexity can reduce maintenance and risks.

5) FAQ

Is carbon surface heating eligible for funding?

Under certain conditions: yes. Eligibility for funding often results from the building standard achieved (overall concept) – not necessarily from an individual measure "heating". The respectively valid funding conditions and evidence in individual cases are decisive.

Why do you consider kWh/year and not just efficiency indicators?

Customers pay for the kWh that arrive at the meter. Especially with very low heating loads, the absolute amount of energy is small – then the overall calculation of investment and operation is decisive.

Does the result apply to every building?

No. This is a building-specific example. With a higher heating load, different area, different usage profile, or without PV, the result may differ. Individual planning is recommended.

Would you like your own numbers? Send us a brief description of the living space, building standard, and PV status – we will create an individual assessment.

Request Individual Calculation
Note: This page is an informational representation and does not constitute a legally binding funding commitment. Funding programs and conditions are subject to change; the respectively valid guidelines are decisive.
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