has everyone used a normally open water valve when plumbing their system to prevent excessive pressure build up in the event of a loss in power?
Ideally, you want a normally closed zone that will open and then gravity flow when power is interrupted. The zone should have enough heat emitting capacity to handle whatever is going on in the boiler. This is often very tough to do given that you need enough capacity to handle the 100% output of the boiler with a full load of wood.
Design accordingly for the worst case scenario because that's when Mr. Murphy of Murphy's Law fame always tends to show up.
You mean a normally open zone valve? Or one that opens when power is lost.
Some people in your situation just hang some radiation (e.g. Slantfin) above their boiler & use that for a dump loop.
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