Originally posted by HenGus
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When there is heating demand from one HR92 zone, the boiler will probably go to max designed flow temp set at the boiler (70 degrees C on my Intergas boiler for instance) and this room will heat up. The other rooms will also receive a higher flow temperature, but the HR92's should be putting the brakes on these radiators anyway (so the flow rate into them is minimal).
Once in the control bandwidth, the boiler will modulate below the designed temp of the system and remain in the lower spectrum of condensing mode which is its most efficient point.
For me the evohome multi zone system is still the clear winner - to revert backwards would be a mistake (as the control would be effectively removed from the individual zones).
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