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    Navien boiler - won't work with open vented system?

    Just had a new Navien system boiler installed to replace a very tired Worcster. The existing system is open vented, but the Navien requires 1bar min to operate it says. When we specc'd the boiler, nowhere did it say that the system boiler (NCB-33LHWE) was not suitable for an open vented system...
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