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For two years now we've been strugging to achieve modulation of our central heating, and I'm starting to wonder whether the VR66 is the problem. Here's our setup: vSmart thermostatic controller, connected to... VR66 Wiring Control Centre with NTC sensor for hot water cylinder, connected to...

We have a modern, thermally efficient house. Last year we replaced our boiler with a Vaillant ecoTec model. Due to compatibility issues with our existing Honeywell room stat we had to replace that too, so we went for Vaillant's vSmart control system. According to the Vaillant advertising (such...