Estimates the household's installed emitter (radiator) capacity from steady-state operating episodes. For each episode the rated output at ΔT50 is inferred from the standard radiator equation heat = rated × (ΔT / 50)1.3, where ΔT is mean water temperature (flow + return) / 2 minus room temperature. Each estimate is weighted by the heat energy delivered during the episode, building a histogram of rated capacity vs kWh delivered. Requires episodes with heat, return temp and room temp data.