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Solar Thermal

Solar Thermal Hot Water capture solar energy and convert it into thermal energy (heat). The heat is then transferred to the water in a hot water tank either directly or via a heat exchanger.

Below are the standards required to be met to be able to install Solar Thermal under the MCS scheme. Approved guidance and reference materials to be used with the standards can also be found below.

Technology Specific Scheme Requirements

Solar Thermal Systems

MIS 3001

Solar Heating Standard



MCS 024

Solar Domestic Hot Water Energy Calulation




MCS Domestic RHI Metering Guidance Document




MCS 012 Important Information




70kWth Application Guidance*



Installer standards that have been withdrawn are available for reference here.

Solar Thermal Reference Materials

The following reference materials have been approved for use alongside MIS 3001:

Document Download here Version
Thermal Solar Performance Energy Calculator Download here                 1.2
Technical Note: Calculation for Solar Thermal Total Installed Capacity Download here N/A 
Energy Saving Trust CE131 - Solar water heating systems: guidance for professionals, conventional indirect models Download here N/A 
*The MCS Standards Management Group (SMG) has prepared a guidance document (found above) to assist installers and the wider industry in understanding the intent of how the thresholds, set within each MCS Installation Standard for the heat technologies, shall be practically applied to design, installation and commissioning work under the MCS scheme.
This document has been prepared by the MCS SMG, taking into account the views of the industry to ensure that systems can be adequately designed and installed under the scheme, whilst reinforcing with installation companies the need to ensure they have the relevant competencies to undertake the tasks associated with these systems.
An MCS certified Installation Company should ensure they follow this guidance, and MCS reserves the right to amend the guidance as necessary through periodic review without prior notice.
The 70kWth threshold was noted by the Scheme as a threshold which aligns with the existing competency criteria set out by the Scheme, and other industries such as oil and gas.