On Thu, 24 Nov 2005 18:37:12 +0000 (UTC), "John"
wrote:


Hi, Is is necessary to drain a domestic C/H system just to change
secondary heat exchanger on a combi boiler (Brittony 80)?

Thank you,


Not if you can close off the system isolation valves. Then you only need to
depressurise and drain the boiler

I can close off the system isolation valves.
How do I depressurise the boiler?

Thanks again,

AL D

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