In my open vent system, I have a drain on my boiler return, upstream of which is a Magnaclean. I have valves on my F&E and vent pipes with a valved mains loop into the vent. I want to flush the boiler alone. My plan is to close the pump gate on the upstream (low pressure side), close the Magnaclean, close the vent pipe and open the boiler drain. This should allow a reverse gravity flush of the boiler. Then I plan to close the F&E pipe and open the mains loop. This should reverse flush the boiler, and nothing else apart from the flow pipe. The boiler is a Viessmann Vitodens 100C. I suspect it has some muck in it. Because of the small part of the system being flushed, I will not lose a significant amount if inhibitor.
Is there any problem with this proposal?
Is there any problem with this proposal?