ηS calculator — Regulation (EU) 2024/1103
Pick your heater type and control functions to get the seasonal efficiency (ηS), the pass/fail result against your category's threshold, and the control code your instructions and technical documentation must state.
Category and function names follow the wording of the regulation.
Towel rails ≤ 60 W have no ηS threshold — instead they must limit working time to a maximum period of 6 hours.
Already decided?
The GPO iotHub TPCB board ships with this configuration out of the box: TW (0/2/3/0/0/0/0/0)
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We will send you the result, the control code, and a link to the regulation text — useful for your technical file.
Source: Regulation (EU) 2024/1103, Annex II (thresholds) and Annex III, tables 10–11. Read the regulation on EUR-Lex
Figures as of: October 28, 2026
This calculator is for reference only. It does not replace your own technical documentation or a notified body's assessment.
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