The following product guides are available for the HCHE range:
Ambirad VCH-HCH - Product Guide - November 2004 - https://www.reznor.co.uk/wp-content/uploads/2023/12/AmbiRad-VCH-HCH-Sales-Brochure-EN-2004-11-GB-WA-024-1104.pdf
Ambirad VCHE-HCHE - Product Guide - October 2002 - https://www.reznor.co.uk/wp-content/uploads/2023/12/AmbiRad-VCHE-HCHE-Sales-Brochure-EN-2002-10-GB-WA-042-1002.pdf