docs: for PR #5257

ACKNOWLEDGEMENTS.md

@@ -837,3 +837,4 @@ Further device support has been made with the assistance of users. Please consid
 - [vanyasvl](https://github.com/vanyasvl) for contributing support for Afyeev 32A 7kW EV charger.
 - [Flechaa](https://github.com/Flechaa) for contributing support for HTW IX75B air conditioner.
 - [n4dwxihyehyes2](https://github.com/n4dwxihyehyes2) for contributing support for WS2812 based Christmas lights.
+- [reitermarkus](https://github.com/reitermarkus) for contributing support for Klamer 2600W IR heater.

DEVICES.md

@@ -52,6 +52,7 @@
 - Juskys OH125BW2 oil radiator
 - Kennedy II/JR electric fireplace
 - Kesser Infrared 400W wall and 3000W heaters with and without lights.
+- Klamer 2600W IR heater
 - Klarstein Bornholm Smart 1500 convection heater
 - Klarstein Bornholm Electric heater (1kW, based on WBR3)
 - Klarstein WnoderSky IR heater (360W ACO14)