In an earlier contribution to this discussion,
Andy Hall wrote:


it's suitable for a normal boiler as well, since if the bypass opens,
the flow increases anyway.


The thing that worries me about this discussion, though, is that if the
Alpha has reduced its power/speed/head because the flow has reduced, there
may not be enough head to open the by-pass. There may not then be enough
flow through the boiler to remove the residual heat after it stops firing.
How do you ensure that this doesn't happen?
--
Cheers,
Set Square
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