ThermaGrid

ThermaGrid is a professional hydronic heating calculation tool designed for HVAC engineers, installers, and field technicians who need fast, reliable answers on-site. It replaces spreadsheets, lookup tables, and manual calculations with instant, on-device engineering tools for real-world hydronic system design. Key Features Heat Load Calculator Calculate BTU/hr heat loads using area, temperature difference (ΔT), and U-value. Instantly convert results into W/m² and BTU/sq ft for fast engineering reference. Radiant Loop Balancing Balance manifold circuits by entering loop lengths and loads. Automatically calculate total flow rate (GPM) for accurate system distribution. Pipe Sizing Tool Select the correct copper pipe size based on flow rate and maximum velocity limits. Instantly verify actual fluid velocity for safe system design. Expansion Tank Sizing Determine minimum expansion tank volume using system volume, maximum temperature, fill pressure, and relief pressure parameters. Built for HVAC Professionals Hydronic heating engineers HVAC installers and technicians Radiant floor heating specialists Mechanical system designers Designed for Field Use ThermaGrid features a clean, high-contrast interface optimized for job sites and field environments where fast decisions matter. No Cloud. No Accounts. No Delays. All calculations run locally on your device. No internet connection, no subscriptions, and no user accounts required. ThermaGrid is the field tool that keeps your designs accurate and your installations reliable.