Why use Size-it?

Size-it is the leading professional sizing tool for water heater specification in the UK. It's comprehensive database allows you to select the different parts that make up your property type and hot water requirements. It will then recommend the most suitable Andrews Water Heaters product solution for your job, along with a detailed summary report and all the technical information required to complete a hot water schedule. Size-it is online and constantly updated with the latest UK legislation so all the information, specifications and advice you need are always to hand, anytime, anywhere.

The UK's original and best sizing tool

Size-it was the first sizing tool launched by a commercial UK water heating company and we're proud to say it's still the best.

Designed specifically for the UK market

As Size-it is designed specifically for the UK market, you'll find the property types, regulations and advice are all relevant to the specific needs of building services and public health.

Accessible on any device, anywhere, any time

Size-it is now available online and is compatible with all devices and operating systems including Apple, Android and Windows. So, whether you're at your desk, on site or in a meeting, Size-it can be accessed through any of your devices.

Up-to-date legislation

When UK legislation changes, Size-it will be updated too, so you can rest assured that the information you receive is always up-to-date and meets UK requirements.

Personalised and responsive

Tailor the sizing to your exact property requirements and Size-it will match the product and provide all the information, design tools and legislative guidance you need. You can even see how small changes affect the results.

User friendly and intuitive

Our instructions, advice and simple navigation ensure Size-it is quick, easy and simple to use from finding the right water heater through to requesting quotes and arranging site visits.

Manage a portfolio of projects

With Size-it you can manage your whole portfolio of projects. You'll have all the information you need in one place and you can even save projects to use as templates for future jobs.

Unrivalled supporting content

Easily accessible and up-to-date advice, product information and links to technical sheets, including CAD, BIM and energy labels.

Additional efficiency credits

You will gain two additional heating efficiency credits just for using our Size-it tool to specify Andrews water heaters for your job.

40 years experience

Our Size-it tool benefits from our 40 year experience as the leading supplier of gas-fired commercial water heaters in the UK.

Andrews. Built to perform.

Whichever Andrews water heater Size-it recommends for your job, our industry-leading products are designed to work and keep on working. First time. Every time.