Need Help?

Need help with an existing system?

View Manuals

Heat Loss Calculator

The only tool you need to calculate heat losses

Use this calculator to select appropriate radiators and to correctly calculate boiler size

Why spend valuable time doing manual calculations when you can use our simple and easy to use calculator

You input the data and the calculator will provide you with:

  • Room heat losses

  • List of suitable radiators

  • Correct boiler size

  • List of appropriate boilers

  • Well presented project calculations and breakdown reports

To purchase a copy of the calculator please visit:

or email

EES Data Ltd have teamed up with the Heating & Hotwater Industry Council and re-developed the HHIC heat loss calculator to operate on all Microsoft (c) windows platforms including the latest Windows 8 system. The new version 6.2 of the calculator and future upgrades and updates will be made available for download from a secure internet link.

The new software, user licence, upgrades and updates together with the technical support package is available on subscription at annual fee of just £100.00 per year plus vat.

The annual subscription /support fee will provide you with:

The new Software for installation 

The User Licence 

On-going program changes and upgrades throughout the year 

On-Line PC to PC connected assistance 

Telephone, E-mail and Internet support 

Regular Program and data updates 

Telephone assistance 

Version 6.2 of the calculator is now available.

Released February 2013

Latest from HHIC:

RT @energyutilities: With #carbonbudgets, increasing #fuelpoverty & concerns re the sustainability of the UK’s energy, it's worrying that t…

Follow us