Worth of OpenTherm and/or Smart TRVs with 2 zone heating

Basic WC is quite limiting as it sets the flow temp rigidly according to the outside temp.

This means when heating from cold you have a low flow temp and the house takes ages to warm up. It’s more suited for properties that are permanently heated.

Advanced WC is a very different thing but not built into that boiler.

OT has the advantage that it will run on a higher initial flow temp that is still relatively efficient as the return temp coming back will be lower but as the house warms up and the stat gets into its control band it will progressively lower the flow temp

its cruise control for heating…
 
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