See how quick and easy Size-it is

Tailor the sizing to your exact project requirements, Size-it will give you all the information you need, anytime, anywhere.

Select property type

Why use Size-it?

The UK's original and best hot water sizing tool designed specifically for the needs of the building services industry

Additional efficiency credits

Unrivalled supporting content

User friendly and intuitive

Personalised and responsive

Accessible on any device, anywhere, any time

Manage a portfolio of projects

Find out more about the benefits of Andrews Size-it


Our FAQs are a quick and easy way to find the answers to your Size-it queries.

Quick Calculator

Quick Calculator

The quick calculator gives an indication of the range that may be suitable.



It's easy to register and you can start your sizing straight away.

Contact Us

Contact Us

We have a dedicated team of industry experts on hand to help you.