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Boiler wiring at fezster's request This is before the setup was extended with VRC 470, which added edge connector to wire the external temperature sensor.

Cheers bro. I will watch my bills. Lower temps will give very, very comfortable conditions in the house. I've been testing this for months and I won't go back since I love it. The original idea of the thread is yours. I highly appreciate that you aired your thoughts in December 2017. Without...

>> I see - so you've disconnected the grey/orange on your HW 2 port valve from any power, >> and rely on the VR65 using ebus to activate the boiler when the HW zone valve is open? Exactly. Power of HW 2 port valve is controlled by Nest according to Nest's HW schedule. Nest's on/off switch...

Fezster, -- grey and orange are connected directly to the microswitch of the valve. VR65 is capable to determine if grey and orange wires are opened or connected together and activates hot water mode if connected together. No voltage on them! :)

That’s right. VR65 to active hot water mode via simple on/off switch and VRC 470 to activate weather compensation (flow temp control for heating). VRC’s thermostat feature is automatically deactivated if it’s installed in the boiler facia. So VRC 470 is not controlling temperature in the house...

Replying to myself. Wanted to document the fact that Vaillant boilers will work with switched live thermostats (Nest), with hot water cylinder charging activation via switched live thermostats (Nest) <-- (click this link for detail) AND with weather compensation mounted on fascia (VRC module)...

Hello lovely people I have Valiant 428 heat-only boiler on S-plan Plus pipework. 3 heating zones are controlled by 3 Nest thermostats via Switched Live Terminal 4. System water temperature is set at constant 45C. Lovely config. Now can I add Vaillant eBus Weather Compensation product (VRC...

Gotcha. Well, since we now know VR65 activates proprietary cylinder charging mode via classic switched live controls I’m quite happy to be deprived of knowing the mystery of eBus commands behind the scene :) :) Good luck with your lockdown project. Hope you’ll crack the code this time.

What stops you now from logging all eBus traffic? Hope OpenTherm will prevail eventually.

Glad you liked it brother. I personally find it amazing. So stupid that Vaillant don’t advertise their VR65/66 as a simple box that converts external on/off contact to eBus commands that switch on/off boiler to heating mode :) They miss huge market opportunity in this country. Let’s see if...

Cheers mate. This was deliberate. Decided to register and post this info since I haven’t found definitive confirmation anywhere online. Expect this forum to keep it for the future.

fezster, I can confirm that VR65 will work exactly as you originally described. HW flow temp control via eBus works perfectly with traditional switched live (SL) controls like Nest. SL controls are not mutually exclusive with eBus controls. Boiler will satisfy both demand from eBus and from...