Vaillant Boilers, Nest and Opentherm

[Jerry]

Customer is going for an Ideal Vogue Max! That fixes that problem.

Thanks for all the input gents.

J

 

[Harvest Fields]

Customer is going for an Ideal Vogue Max! That fixes that problem.

Thanks for all the input gents.

J

Good luck with that

 

[Viacheslav]

You can connect Vaillant boiler and Nest (3rd Gen) using OpenTherm via VR33 module (personally I made it with AtmoTEC Pro combi boiler). VR33 was made for Belgium and the Netherlands, but you can use it anywhere. Consider that Vaillant VR33 costs bit more than absolutely same modules made under other trade marks like AWB or Saunier Duval. So you can find the solution.

 

[EvilDrPorkChop]

You can connect Vaillant boiler and Nest (3rd Gen) using OpenTherm via VR33 module (personally I made it with AtmoTEC Pro combi boiler). VR33 was made for Belgium and the Netherlands, but you can use it anywhere. Consider that Vaillant VR33 costs bit more than absolutely same modules made under other trade marks like AWB or Saunier Duval. So you can find the solution.

But doing so voids your warranty here in the UK

 

[tonyramponi]

Related to this thread, I have a Valliant ecotek Pro with a VRT350 controller which I believe modulates the bolier. I've acquired an unwanted Nest E thermostat but not sure if I want to use it unless I get my hands on a VR33.

I've had a slightly bonkers idea - What happens if I connect the nest to the on/off boiler switching but leave the VRT350 connected and set to a fixed temperature?

If the VRT350 still works but is overridden by the switching of the nest I would theoretically have a system which modulates the boiler in normal use but could be switched off using the nests geo location facility. A set-back temperature could be maintained using old school on/off switching.

I guess I wouldn't get the full benefit of modulating control since the outsIide temperature wouldn't be factored in when determining the demand in winter.

Is this a dumb Idea or worth a try?

I have a 1930's semi and i'm forever fiddling with the timer programs in order to get the house to warm up in time for when we get up. I guess I should stop being tight and get Vsmart controller or a VR33. Am I correct in thinking the Vsmart can do outside temperature compensation using internet temperature data?

Thanks,

Tony.

 

[ShaunCorbs]

Won’t work as you can’t use ebus and on off at the same time

 

[tonyramponi]

Thanks, so in other words the ebus has priority over both the 24v and 230v thermostat switches?

The only reason I was thinking it might be the other way round was the need to install the jumper wires on the other terminals when using the ebus. I.e Why do you need the jumper wires?

I was thinking that using the nest to replace a jumper wire would allow it to override the ebus until the nest demanded heat. When the nest is demanding the jumper wire would be back in place and the ebus would back in control.

I could quite easily make something to disconnect the ebus when the nest is in set-back mode and switch it back in when the opposite is true but this probably too much of a dirty hack with unknown consequences. My original idea doesn't feel quite so dirty if the ebus is just ignored when a jumper is effectively removed.

 

[Jerry]

Put an hourly rate (£/hr) on your time. Then estimate the amount of time you guess you would spend trying this, before giving up and/or breaking something. Then add on the additional time you would spend being annoyed if you had managed to get the system partially working but not exactly how you would want it.

When you have this total, compare it to how much a plug-and-play unit would cost. Then go from there.

Don't forget to add the time you have spent on the forums.

And not a single mention of warranties etc

😆