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  • In need of a HVAC repair? (978) 804-2725
  • The Navien Heating Boiler (NHB) Series is available in four wall-hung sizes — NHB-55, NHB-80, NHB 110, and NHB-150, with turn-down ratios, respectively, of 7:1, 10:1, 11:1, and 15:1. 

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