I have been going back-and-forth with a couple different contractors to decide which boiler is the right one to go with. Right now the decision is between a navien ncb-e combi-boiler 150E or 180E. But I have also looked at Bosch Lochinvar and Rinnai trying to figure out which system is the right system. I have attached the heat loss calculation. This house has one bathroom minute and is located in the Worcester Massachusetts supply water temperature can get between 38 and 40 in the winter. Just looking to make sure I make the right decision.
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