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I think I am clearer now, thanks. Might have some more questions but will join in on the other thread.

I am new to all this but have been trying to understand what is going on in my new installation. But I did think the idea of this cleaver system was that it could maintain a temperature based on conditions such as outside temperature and not just switch on and off like a regular thermostatat...

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I have just started using my new valiant 418 for the first time with heating. I have the VRC 430 and am finding that when the rooms get close to temperature the boiler pulses on and off about every 45 seconds. Is this normal, it appears to be try to achieve a flow temperature of about 40c which...