K&S WP-Rechner

The K&S heat pump calculator helps you to accurately design a heat pump – whether for new construction, renovation, or as a tradesperson/energy consultant during customer consultations.

















... WHAT THE CALCULATOR CAN DO

- Record your current heating system: Determine consumption, prices, and CO₂ emissions of your existing gas or oil heating system

- Directly enter the standard heating load (Q_N) – building type and climate zone determine the appropriate standard outdoor temperature

- Heat pump design according to VDI 4645: monovalent, monoenergetic, bivalent-parallel, or bivalent-alternative

- Automatic recommendation of the appropriate heat pump nominal output, including sizing of the heating element/auxiliary heating system

- Hot water design according to DIN 4708 / DIN V 18599-8 (number of people, residential units, bathtubs, circulation)

- Individually set the seasonal performance factor (SPF) and derive the electricity consumption from it

- Cost comparison & CO₂ balance: direct comparison of your existing heating system vs. a heat pump

- GEG § 71h check (65 % Renewable Energy Mandate)

PDF CUSTOMER REPORT

All results can be exported as a clear PDF report with the touch of a button – ideal for documentation or for on-site customer consultations.

WHO IS THE APP FOR?

Tradespeople, energy consultants, and technically minded homeowners who need an initial, reliable assessment of heat pump sizing. A heat load calculation (e.g., according to DIN EN 12831) is required.

All calculations are performed exclusively locally on your device – no data is collected, stored, or transmitted. No advertising, no tracking.

Note: This calculator does not replace a legally binding heat load calculation and technical planning by a qualified professional in accordance with DIN EN 12831.

An app by K&S Energy GmbH.