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

T*SOL is a professional simulation program used to design and optimize solar thermal systems, including domestic hot water, swimming pool heating, and process heat. Free Access Options

: Calculates energy performance across a year with a 6-minute resolution.

: Includes all professional functions for simulation and profitability analysis.

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

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

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

: For those in education, full 180-day licenses are available for a nominal fee of 90.00 EUR (plus VAT), though this is not strictly free. Key Features of T*SOL