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Potential problems with combined feed and expansion pipes: 1. To avoid convection of hot water into the feed/ expansion tank, the U tube connection of the combined feed/ expansion pipe to the flow pipe from boiler is essential (as shown in your "low head installations figure). But with this...

After a couple of days of testing and fine tuning I'm pleased to report that it works, and I now have a cold header tank. The anti-siphon loop also needs to be high enough to overcome the pressure surge when the pump starts up. This will depend on pump speed and height of expansion tank above...

Thanks for your expert appraisal and diplomacy. Please explain to us all why my diagnosis and solution is cobblers.

NO it should be cold. I have this problem, and it's not due to expansion pipe overflow. The height of my F&E tank above the point where the cold feed pipe joins the delivery line from boiler to the heat load is only about 1m. The tee off the delivery line has the feed from the boiler on the...

this recommended lamp is this Your recommendations are precisely what I have in mind. Much thanks for feedback.

Will a free standing PIR detector switch a compact flourescent without an intervening relay - without problems?