Get in touch
Email grwwebsitebeheerder@gmail.com.
Reporting a calculation issue?
Include the page you used, your selected units and either your input values or a scenario link. Tell us which result looked wrong and what you expected. Please do not include account numbers or a full energy bill containing personal information.
Before you write
The methodology explains what is included in the estimate. For heating-system design or installation advice, speak to a suitably qualified local installer.