Condensing domestic water heaters

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eQuesters -

What are people's preferred method of dealing with condensing gas-fired
domestic water heater efficiency? Since it's domestic water there are far
fewer variables to deal with, such as supply temperature resets, than a
heating water system. Is specifying the HIR at the design conditions enough
for a domestic water heater, or do we need to generate specific performance
curves to take account of savings based on a condensing water heater versus
a baseline efficiency model?

Thoughts?

Steven

Steven Savich, LEED AP

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