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Thank you very much for the advice, gentlemen. The Service information for the 500 (but not the 600) does indeed have an excellent explanation of the boiler's operating logic. As I understand it, the pump over-run does not, however, affect whether it can short cycle. If the room stat calls...

I'm about to specify a combi for a new install, which will be fully zoned with motorised valves. Buderus was favourite, till I tried to find out whether it has any short cycling prevention (since it will sometimes be running with just a few hundred Btu/h of load). I can't find anything on...

Have you got the Installation and Servicing Instructions book? I have, and I don't need it any longer, so if you want it, it's yours for the cost of the postage or I'll scan a couple of pages and email them. Kevin