Can you use a mix of wired sounders and wireless Heat / Optical sounders?
Why EK-WL8-HS and EK-WL8-OS should not be mixed with standard ESP wired sounders
NO. EK-WL8-HS and EK-WL8-OS tones do not match our standard ESP tones, BS5839 requires sounders tones to be similar throughout the building.
Last reviewed: 2026-06-16 — Reviewed by: Takashi Ishikawa