OPTI MOD Function

Vaillant Gas Water Heaters atmoMAG owe their high warm water comfort to their integrated OPTI-MOD function. It ensures highest comfort with utmost efficiency.

With two simple steps the users can adapt the atmoMAG to their individual requirements.

OPTI... refers to the preselection of the appliances' water output between approx. 50% and 100%. As a rule the inlet water flow through the tap determines the outlet temperature. This method offers advantages with high inlet water temperatures. Since the incoming water is preheated, less gas is needed to reach the outlet temperature. This saves a lot of energy.

...MOD: keeps the water temperature constant independently of how far the tap is opened. The burner flame adjusts itself automatically, thus the minimum gas rate required is used to heat the water up to the desired temperature chosen by the user.

The best starting sytsem for every requirement

All atmoMAG with OPTI-MOD function show the same high warm water comfort. However, their ignition systems may differ.

The piezo ignition of the MAG XZ represents a perfect standard solution which has proven itself for decades. With increasing requirements on energy savings, the MAG XI is the one to count on. Its electronic ignition works with main connector or batteries. Giving up the permanent pilot flame leads to a remarkable saving of energy without interference in the various stages of operation. The batteries, if used, can easily be replaced at the front of the appliance. Their durability is a minimum of one year.

Our model especially designed to meet basic requirements - please see our technical data.