Vaillant water boiler solution

Questions & Help
1

Hi, I have water underfloor heating on Vaillant gas boiler and ofcourse water heating. I have manual termostats in each room. I am hesitant to spend any money on smart termostats, because I barely change temperature during winter. Its just how underfloor works and the cost would never justify, i would not save any money with it.

Anyway I would like to find solution for water boiler so that I can monitor and set water heating for presence at home and vice versa.

Any tips how can I easily connect it to Homey? So my purpose is to control water boiler not house heating. Many thanks for suggestions.

2

Hello,

I think the Vailant boiler will have a signal cable / input that when live tells the boiler to heat the hot water. Some plumbers wire that to a momentary switch because and I think it gets overridden by a wired timer input if one is installed. You could use a fibaro/other relay / switch to trigger that and then some flows to control the timing or maybe one of the heating scheduler apps: https://homey.app/en-us/app/app.mskg.homey-heating/Homey-Heating-Scheduler/ or https://homey.app/en-us/app/no.almli.heatingcontroller/Heating-Controller/ perhaps?

3

I doubt that.

4

Does your vaillant support opentherm.
In that case the opentherm gateway can be a start.
There is an app for it.
This way homey can set opentherm parameters

5

Seems like I need to add module vr33 to my Vaillant. Thanks for the hint. https://myboiler.com/opentherm/vaillant-opentherm/

6

Why do you doubt it? My ecoTEC 627 had it, and that’s how many boilers work. How do you suppose wired thermostat requests heat from the boiler?

7

So the simple relay you think might help me?

8

Trough a special designed protocol for it like Nefit has or something like OT. If u think any Vaillant can be a relais attached to to get the hot water heating then i doubt that.

9

Well I don’t know about "any Vaillant ", and I don’t know what “Nefit” “OT” are but certainly the one I mentioned works with simple electrical circuit / signal that sends demand for heating, and indeed my plumber used a Fibaro switch relay to make it work. I suspect since it is only 2 years old, then many other boilers work the same. I can’t see why they would need anything more complicated from a physical timer switch or thermostat installed in so many many houses.