Use this calculator to assist in sizing solar water heating systems in the UK. The calculator will produce estimates of performance and energy savings based on our own calculations and research. It will also produce performance estimates based on SAP as required by  the Microgeneration Certification Scheme (MIS 3001).

Once you have selected a system the calculator will produce a Bill of Materials and you will be redirected to our online shop where you can order the equipment or receive an instant quotation.