Boiler Upgrade Scheme: Guidance for Installers

This guidance document is for installers looking to complete low carbon heating installations as part of the Boiler Upgrade Scheme.  

The scheme provides a grant to help cover the costs of installing low carbon heating technologies, such as heat pumps.  

The installer guidance covers:  

• an overview of the Boiler Upgrade Scheme 
• the roles and responsibilities of all involved in the scheme 
• eligibility requirements
• creating and managing a Boiler Upgrade Scheme installer account
• how to submit a voucher application and voucher redemption
• grant payments
• grant values and scheme budget  
• audit and compliance activity
• reporting timetables 
• the queries, feedback and complaints process 

Choosing the right guidance for your application

Version 5 of the Boiler Upgrade Scheme guidance for installers is the current version and applies to all applications ‘properly made’ on or after 28 April 2026. 

Version 4.2 published on 9 April 2025, is available to view and applies to applications ‘properly made’ before 28 April 2026. 

A voucher application is only considered ‘properly made’ once Ofgem has all the necessary information to assess eligibility, and you have provided consent and identity verification.  

At redemption stage an application is ‘properly made’ when Ofgem has all the required information.  

Where further information is requested, an application will not be consider properly made. 

If you need to access an earlier version of the guidance, contact us at BUS.Enquiry@ofgem.gov.uk .