On Thu, 26 Aug 2004 00:52:38 +0100, chris French
wrote:

In message , a
writes

On a related note, can you run a combi boiler for just DHW with the CH
circuit depressurised/drained?

No, they won't run if there is not enough pressure in the system.

One reason why a couple of full-bore ball valves are useful in the
flow and return, just under the boiler.

Rob


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