Data privacy

This tool runs entirely on your device. Everything you enter, your calculations and your results stay in this device’s browser storage and are not sent to any server or third party. There is no account, no tracking and no analytics. Nothing is shared unless you choose to share it yourself, by exporting a file, producing a report or sending an email.

Disclaimer & competence

This tool estimates how heat pump controller settings affect room temperature, efficiency and running cost. It is intended to help competent persons commission and tune heating systems, and to help householders understand them. It is a calculation aid for teaching and tuning only. It is not a design, a commissioning record or a substitute for professional judgement, and it does not by itself satisfy any MCS, Building Regulations or other regulatory requirement.

Results are estimates. They depend on the information entered, the simplifying assumptions set out in the guide and the published data cited. Always follow the heat pump and controller manufacturers’ installation and commissioning instructions; where they differ from this tool, follow the manufacturer. The user is responsible for checking all inputs and outputs, for working within their competence, and for compliance with current UK legislation, standards and manufacturers’ instructions. To the fullest extent permitted by law, the author accepts no liability for any error, omission, or any direct or indirect loss or damage arising from use of this tool or reliance on its output.

Copyright

© 2026 Easy Heating Engineer. All rights reserved. This tool may not be reproduced, redistributed, or modified without written permission. Sources (BSI, SAP, RdSAP, MCS and manufacturer data) are cited for reference only.