If the system has a gravity hot water circuit, won that reduce the flow rate of water through the radiators when carrying out the individual radiator flush?
If you use the circulator pump adaptor leads to connect across the circulator pump connections, or connect onto radiator tails, you shouldn’t lose much of the flow, if any, through the large diameter pipework of the gravity hot water circuit. However, this will not clean the gravity hot water pipework. Some engineers will re-locate the Clearflow pump and connect it across the cold feed and expansion piping to force water through the gravity hot water circuit. If there is one radiator on the gravity hot water circuit or a towel rail, as is sometimes the case, you may be able to connect your Clearflow across the radiator tails. In and ideal world, you would disconnect the gravity hot water pipework at the boiler, and then powerflush the hot water circuit separately – but this is far from easy in a back boiler fired gravity hot water system.
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