Guides and Documentation

Detailed guides for using the calculators and background information on the standards and calculation methods used.

Available Guides

Heating Load Guide

Comprehensive guide to heating load calculation according to DIN EN 12831-1, explanation of input parameters, interpretation of results and frequently asked questions.

Solar Guide

Guide to PV system calculation, PVGis data, self-consumption optimization and economic analysis.

Heat Pump Guide

Guide to SPF calculation according to VDI 4650, heat sources, system temperatures and integration with other calculators.

Standards and Norms

All calculations are based on current German and European standards:

• DIN EN 12831-1: Heating load for residential buildings
• DIN EN 12831-3: Domestic hot water heating
• VDI 4650: Seasonal performance factor of heat pumps
• VDI 2067: Economic efficiency calculation
• GEG 2020: Building Energy Act (Germany)