A statistical-population treatment of the European Heat Pump KEYMARK certification corpus for air-to-water heat pumps: deduplicated test-point data, population-scale EN 14825 SCOP validation, mixed-effects population COP models with per-product uncertainty, Estonian climate-transfer data, building archetype load profiles, and standalone conversion code for dynamic building energy simulation. Contents models/ — Mixed-effects population COP models of the Log+InvSqrt form COP = β₂ + β₀·ln(ΔT) + β₁/√ΔT, with per-product random effects. All-climate variant (53,551 EN 14825 test points, 3,395 heat-pump groups: β₀ = −1.8528, β₁ = +18.0463, β₂ = +7.2602) and cold-only variant (11,397 Colder-zone points, 979 groups: β₀ = −2.5819, β₁ = +6.6052, β₂ = +11.7252), plus functional-form comparison tables. scop_validation/ — Batch EN 14825 bin-method SCOP recalculation for 26,478 valid configuration×climate×supply-temperature rows (declared vs recalculated SCOP and deviations); implementation validated against the EN 14825:2018 Annex H reference example (3.60 vs 3.61). training_data/ — The 53,551 deduplicated EN 14825 part-load test points (COP vs temperature lift, with supply temperature, climate zone, and group identifiers) used for model training. climate/ — Estonian test reference year (1990–2020) heating-season hours mapped to 1 °C bins alongside the EN 14825 Colder template, with part-load factors and population COP per bin; population SCOP shape factors under both climates. archetypes/ — Synthetic hourly space-heating and DHW load profiles for two Estonian single-family-house archetypes (pre-retrofit and nZEB), with parameter manifests. code/ — Standalone Python implementations of the EN 14825 bin-method SCOP calculator and the four-step SCOP→hourly-COP conversion (heating curve → population COP shape → α-rescaling → capacity-aware piecewise operation) for dynamic building simulation. extended_results/ — Extended tables and figures with additional population statistics (joint SH+DHW cohort, random-effects covariance, DHW statistics, TRY bin redistribution, model-form comparison, data-quality screens). Provenance and rights. All quantities are derived from the publicly available Heat Pump KEYMARK certification database (https://keymark.eu/, accessed 18 March 2026). The deposit is not a verbatim copy of that registry: it contains the authors’ deduplicated, harmonised, quality-screened, and computed compilation in the authors’ own structure. Declared certificate values embedded in the derived tables are factual technical data published by the certification scheme for market transparency; any database rights of the scheme owner in the original registry are unaffected by this deposit. Licensing. Derived data (CSV/JSON): CC BY 4.0, applying to the authors’ compilation, structure, and computed content. Code (code/): MIT License. Funding. Estonian Research Council grant PRG2154; Estonian Centre of Excellence in Energy Efficiency, ENER (grant TK230), funded by the Estonian Ministry of Education and Research; research infrastructure “Energy efficiency and renewable energy research infrastructure” (TARISTU24-TK12). A peer-reviewed journal article by the authors describes the methodology and findings in detail; its reference will be linked in this record once available. Please cite this deposit via its DOI.