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How is the system running since you increased the pump soiler temp also been increased to 80, so that may be making the change. Looking at F & R temp on the primaries they seem better at 70C and
Are you saying the boiler is configured to try and get/maintain a 20C dT.Trying to get a dt 20 difference hence why it’s modulating there should be more of a difference than that something isn’t adding up
No it’s installed correctly … 28mm to 2 manifolds upstairs (flow & return) and 2 manifolds downstairs… no temperature control, but balanced flow. Each zone is temperature controlled by individual digital room stats.If you look there’s two manifolds one for high temp and one for temp controlled with room stats so looks like yours have been piped wrong from day one
That is what seems to be borne out in practice.Viessmann’s are picky they like a wide dt else they modulate
No it’s installed correctly … 28mm to 2 manifolds upstairs (flow & return) and 2 manifolds downstairs… no temperature control, but balanced flow. Each zone is temperature controlled by individual digital room stats.
There is no issue with heating, been working find since install.
Correct it was not part of the Nu-Heat system, they did design & supplied the kit, it relied on the Thermal Store stat controlling temp.But no thermostatic overheat protection / temp blending
But no thermostatic overheat protection / temp blending
That is manifold fo4 all rooms on 1st floor.And the tiled floor is exactly the same as that ?
Reply to the thread, titled "Unable to run bath of hot water after boiler change" which is posted in Boiler Advice Forum on Plumbers Forums.
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