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SaniHEATDomestic Hot Water Sizing

According to EN 12831-3

Key Features

EN 12831-3 Compliance

Eliminate empirical guesswork or manual calculations with a cloud-based calculation engine that based on the equations of the latest EN 12831-3 standard.

Speed

Sizing is now a matter of minutes. Skip the grueling hours of manual calculations and complex spreadsheet building. Simply input your parameters and get professional sizing results almost instantly.

Hourly Demand Distribution

Choose consumption profiles based on different building types, choose from custom ones or define a completely new one to accurately capture hourly peak loads throughout the day.

Multiple Storage & Flow Systems

Seamlessly size mixed storage systems, charging storage systems, or direct-flow installations without storage tanks along with different types of heat generators to match any mechanical plant design.

Dynamic Simulation Graphs

Generate precise needs and supply curves according to EN 12831-3 to ensure sufficiency of the system using a 1440-step calculation sequence.

Draw-off profiles

Compute design flow rates according to specific tap types and different pre-defined tap flow rates.

Distribution losses

Compute and integrate circulation losses in a simple, fast and effective way based on the standard.

Multi-factor consideration

Consider multiple factors like time-lag, sensor height, and standby heat losses in a user-friendly way, without unnecessary or excessive information.

Engineering-grade results

Clear and comprehensive output ready to be used in technical reports and HVAC design.

The calculator and especially the pop-up windows are not optimized for mobile phone use and the user may encounter problems trying to input or view values from a mobile. It is recommended to run the calculator on desktop.

Contact

Questions, feedback or collaboration ideas? Get in touch.

X - Engineering TOOLS
xengtools2026@outlook.com

Disclaimer: The calculations and data provided by this tool are for informational and conceptual design purposes only. While we strive for accuracy, all outputs are provided "as is" without any warranties. This tool does not constitute professional engineering advice. Final designs, load calculations, and equipment selection must always be verified and approved by a qualified, licensed Professional Engineer (PE) in accordance with local codes and specific project conditions.

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