The following installation manuals are available for the PHOTON20 Natural Gas 20kW Unit Heater (PHOTON20-3):
Photon Propane - Product Guide - September 2025(https://www.reznor.co.uk/wp-content/uploads/2025/11/D301362-R3-Reznor-Photon-Propane-Installation-Instruction-Addendum-2025-09.pdf),
Photon - Installation Manual - January 2026(https://www.reznor.co.uk/wp-content/uploads/2026/01/D301310-Iss-9-Reznor-Photon-Installation-Manual-EN-2026-01.pdf)