Hot water heating

Hydronic Unit Heater

Hydronic Unit Heater

Our Rittling hot water and steam heaters are available in a wide range of models and airflow arrangements to meet the high demands of your specifications. All our vertical and horizontal fan heaters are available in inventory year-round. Their robust construction gives them a long service life. A 2-year warranty covers all our hydronic air heaters.


  • Robust construction with epoxy powder coating for extended life
  • Explosion proof motor available
  • Quick delivery always available
  • Low installation cost
  • Full range of diffusers for uniform heat direction



Hydronic air heater, series RH

Hydronic air heater,series RV

Horizontal hydronic air heater, explosion proof RH-Exp

Discover our products

Discover our architectural hot water radiators in steel!

The European style Zehnder Rittling steel radiators are designed for your applications requiring high efficiency without compromising elegance. They are also very effective for your energy saving projects.