Markus Muller

Review of Vaillant GmbH

Unreliable flexoTHERM exclusive WP, bad service, s...

Unreliable flexoTHERM exclusive WP, bad service, smart grid ready (SG-Ready) but not

I had a Vaillant VWF117 / 4 installed in the new building and I am immensely disappointed!
The SS failed 7 times in 18 months. Heating installers and Vaillant technicians were each on site four times, looking for a fault and replacing parts when suspected.

Unfortunately, we NEVER had a warning (acoustic) on the WP via the online module on the ebus in the APP.

APP shows everything ok, display on the heater shows errors. Switch off once, switch on, then it works again. No real mistake to be found.

We already had everything. Only cold water, warm floor, cold water and cold FBH in winter, but also unwanted full heating with a high flow temperature in summer.

In the old house, the oil heating system has not had a single malfunction in 12 years.

With the Vaillant flexoTherm exclusive VWF 117/4, we no longer dare to drive away in winter because the WP does not provide effective and reliable warnings in the event of a failure and failure can occur at any time.

Second flaw. Vaillant bears the SG-Ready logo, which promises smart grid interoperability with a PV system.
My now installed PV with battery storage has the two relays required in the standard with which the WP 4 can be informed of different scenarios. My heating engineer doesn't know how, and it took a long time for Vaillant to back and forth so that the pins could hit the maximum possible, so that the water tank could be brought to the temperature that was already set. Nothing with extra heating above the normal temperature. The FBH cannot be triggered separately either.
That is simply a cheek to say SGready about this.

I will try to change my WP, because that is not acceptable quality and not acceptable customer service.