Gravity Fed Heating system- hot water only?

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I have a gravity fed heating system. Its very old, but works fine. I recently had the boiler replaced and during the job the installer pointed out to me various shut off valves. He made a passing comment that "and that one shuts off the feed to the radiators."

I've never been able to just have the hot water on, or so I thought. Is it just that simple? shutting of the valve leaving the pump running? or am I likely to blow the thing up?

Any help greatly appreciated.
 
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Do you actually mean that you have a gravity Hot water system ? post pics of your system especially the HW cylinder as a gravity fed heating system does not exist, do you mean open vent system ?
 

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