Our hot water storage sizing calculator works out storage volume and reheat time together, for homes and for commercial buildings, with the method and every assumption shown.
Getting the storage volume right is the start of every good hot water system. Our new sizing calculator does the sums for you.
It works out the storage volume and reheat time together, from a 24-hour draw-off profile and the heating you have available. It covers homes as well as hotels, care homes, gyms, student accommodation, schools, offices, restaurants and factories.
Change the heating duty and watch the trade-off: less duty needs more volume, and the other way round. Every result shows the method and the assumptions behind it, prints for the job file, and can be sent to our technical team to confirm.
Where to find it
Go to Hot water storage sizing.
You'll find all of our calculators and finders together on the design tools page. If you'd like a hand with a result, our technical team is always happy to check it for you.