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navien combi opentherm evohome

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    Navien combi boiler and evohome opentherm problem

    Hi all, I just had a new Navien NCB-34WDLE boiler installed to replace my 11 year old Ferroli Optimax HE31C unit. The Navien was recommended to me by a trusted gas engineer, and a few hours reading the literature and testimonals confirmed the choice. The unit does seem very solid and well made...
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