It's a binary boiler. The scheme would work if there was a means to keep the pump running after the call for heat had ended and the 3-port valve had switched to "bypass" mode, but they don't mention this so I've asked for clarification.
In practice, the boiler has never locked-out so I assume it's got enough thermal mass to cope with the burn stopping coincident with the loss of water flow.
In practice, the boiler has never locked-out so I assume it's got enough thermal mass to cope with the burn stopping coincident with the loss of water flow.
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