Opentherm and Hot water kit with internal hot water valve

[deuscreator]

Hey folks,

Here's my issue.

I have a full system with an OpenTherm relay, and a Baxi Luna DuoTec 1.28 boiler. I also have a separate water heater with a simple electrical heating option too, but it is, in theory, heated by the boiler as well. Currently I have the insertion sensor connected to the boiler itself, but I want to be able to control it via the Evohome controller.

The issue is that the valve and pump for the hot water is located within the boiler itself. Can I use the ATF500 kit in some manner? Theoretically the boiler is capable of receiving Opentherm commands regarding hot water. Moreover, it seems that due to the Opentherm controller connection, the internal controls for the hot water temperature are "locked out" and I strongly suspect that only the electrical heating option keeps the water hot at all..

Any ideas are welcome!

[Richard]

The Hot Water OpenTherm Control ID when using evohome doesn't work unfortunately.