Vaillant boiler with tado

[ScottishGasMan]

Nowadays we really should be trying to use modulation controls where possible, rather than on/off switching technology that's been the same since 1904.

The modulation will reduce the flow temperature to where your system can still heat the property, but allow the boiler to condense where possible, increasing efficiency and comfort, it will reduce on/off cycling of the boiler leading to longer service life of many components, and you can have feedback from the control where it will alert you to low water pressure or faults etc.

Look at the sensoROOM (VR 51f) with the myVAILLANT connect gateway. Nice simple control, that give weather & room modulation, smartphone use, and talks to the appliance. There are other Vaillant controls with a higher price tag that have more features, but for a straighforward system this would do the job instead of a tado nicely.

 

[RandomGrinch]

Nowadays we really should be trying to use modulation controls where possible

I agree that modulating controls are better. But the point I was trying to get across to Harry...

rather than on/off switching technology that's been the same since 1904.

The on/off switching technology we have today with smart stats is very different to that we had since 1904.

Smart stats with proportional load compensation, control the on/off time with information of the outside temperature and how long it will take the property to reach the set temperature.

On top of allowing the boiler to modulate itself, a smart on/off stat can perform its own pseudo modulation; basically adjusting the on/off periods, with an extremely long period pulse width modulation.

Again, I totally agree, modulation controllers are the way forward, but a properly set-up load compensating on/off stat, isn't that far behind in terms of efficiency gains.
However, this will be at the cost of more cycling.
It is though, definitely not 1904 technology

 

[Harry Bloomfield]

On top of allowing the boiler to modulate itself, a smart on/off stat can perform its own pseudo modulation; basically adjusting the on/off periods, with an extremely long period pulse width modulation.

Sorry, I dropped out of watching the thread.....

I do agree it is certainly a step up from the original on/off control that we once had, but it is still on/off - it really is not a patch on proper feedback, to control the modulation directly, It is very noticeable, when it comes to maintaining steady, accurate room temperatures.