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!
No, not at all.
That is how they work. You have to replace the primatic with a normal indirect cylinder. Then the CH circuit can be pressurised from the mains. The boiler has to be suitable for pressurisation and use a pressurisation kit of: vessel, high pressure relief valve, filling loop, pressure gauge. Get a quick recovery coil cylinder.
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