The potential customer wanted a price to replace his natural-gas-guzzling boiler. He already knew what he wanted: a Navien NHB modulating condensing boiler set up with outdoor reset and at least one other brand.   Upon arrival to survey the job, his wife explained that hubby could not be present, but here is a list of questions he wants you to answer — in writing. 1. Do you measure for an actual heat loss to size the boiler? Yes — I use the ACCA Manual-J program. 2. I ...

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