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Thanks for your reply. Yes, the plumbing system has to be redesigned to accommodate the integration of the system boiler with the boiler stove. I have worked with a plumber to design the plumbing system. As for the electrical side of the system (having slept) I think I have found the answer to...

Hello Everyone, I plan on integrating 30KW boiler stove with my central heating system. I have a Vaillant 435 EcoTec Plus system boiler (vented system) and Vaillant VR66 contoller and I intend to replace the copper immersion tank with a Gledhill Torrent vented 250L stainless steel heat...

Many thanks for the wiring advice. The VR66 Controller has direct connections for the thermostat, central heating pump, DHW zone valve E Bus and the central heating zone valve. I have attached a couple of photos of the controller wiring. This appears to suggest the controller is managing the...

Sorry for the late update. I wired the new cylinder thermostat (Honeywell L641A1039) in the normally opened position using contacts C and 2. When the DHW was turned on at the boiler, the DHW zone valve did not energise and the boiler did not fire. I decided to leave cylinder thermostat wired...

Cheers. I just purchased a Honeywell L641A1039 cylinder thermostat with both S and Y system configuration options. I will wire the new thermostat as normally open and give the system a trial overnight.

I should add the cylinder thermostat is currently wired in the normally closed configuration.

Thanks for the suggestion. I will configure the cylinder thermostat for normally open and run the system overnight. I will report back with the result.

Hello Everyone, I am a newbie to the forum and I have reviewed several posts on the forum about central heating pumps running continuously. My problem is slightly different as my central heating circulation pump run intermittently for hours. The system configuration is as follows: Vaillant...

Hello Everyone, I am a newbie to the forum so apologies for adding my problem to this thread. I have a similar problem where the central heating circulation pump run intermittently for hours. The system configuration is as follows: Vaillant EcoTec Plus 435 condensing boiler (the DHW is set to...