: Pre-loaded with over 2,000 global climate data locations and 200+ pre-configured solar thermal systems.

: A free, simplified web-based Solar Thermal Calculator that requires no download.

: Provides technical and economic indicators, including CO2 reductions, payback periods, and energy savings.

: Helps dimension storage and collector arrays (including east/west roofs) to find the most efficient setup.

: Includes all professional functions for simulation and profitability analysis.

: You can download a full-featured trial of T*SOL 2026 to test its capabilities on your computer.

: Best for quick estimates before moving to the detailed desktop application.

: It determines the yield and solar fraction of a system based on your location and basic heat demand.