In an earlier contribution to this discussion,
cisco kid wrote:

Hi All - Is is possible to have the radiators pressurised from a
rising main filling loop if the hot water cyclinder is of the Primatic
type. At the moment both the hot water and radiators seemed to be
filled from the hot water cyclinder via a single cold water tank.


No. You will need to replace the cylinder with a standard indirect type, and
supply a header/cold storage tank just for the (secondary) domestic hot
water circuit.

The only other solution would be to disconnect the cylinder from the primary
circuit (and blank off the connections) and heat the DHW with an immersion
heater rather than with the boiler. I don't imagine you'd want to do that!
--
Cheers,
Set Square
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