Has anyone successfully installed Nest hotwater function to 30cdi classic boiler?

[Andrew Staines]

Perfect, many thanks to you all

 

[Andrew Staines]

Hi Picasso, or anyone else who would like to advise,

Just one more follow up query. Whilst looking into replacing the tank temperature sensor with a thermostat I've noticed that I don't have a high limit thermostat. Does a vented tank require one?

 

[picasso]

No you only need the stat or the sensor.

 

[Andrew Staines]

Great stuff. Thanks again.

 

[Andrew Staines]

Good afternoon.

Just to clarify before this happens, is the attached diagram correct for the set up discussed earlier this week?

Please advise if it's not.

 

[Andrew Staines]

Or is it more like this?

 

[picasso]

First one is bang on.

 

[Andrew Staines]

Thanks again Picasso, top man! When it's done I will post the result for the benefit of others with the same query in future.

 

[Andrew Staines]

Update - so in conclusion, yes; you can successfully install a Nest hot-water function to 30cdi classic boiler as well as central heating function!

In brief this is how we did it. (**disclaimer** The following should be performed by a qualified engineer and all power to the system must be isolated!)

First the temperature sensor on the hot water tank was replaced with a thermostat, followed by a factory reset on the boiler so that it would reconfigure itself to use the stat.

Next, the central heating thermostat was disconnected from the boiler terminals and the Nest heat link was installed and connected to the attached diagram (with the hot water tank thermostat wired in series to the heatlink);

Nest fired up and all updates installed. Boiler switched on and all worked as expected.

 

[Brownjamesa]

Hi Andrew,

I have the exact same boiler as you and I belive I also have a temperature sensor on the hot water tank.

Could you please share the thermostat you used to replace it?

Cheers
James

 

[Andrew Staines]

Hi James

This one, you can get these almost anywhere. Worked perfectly for me.
Andrew