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High vs Low efficiency gas boiler?
I am about to convert my 2,200 s.f. house with HW baseboard heat from heating oil to natural gas. Most contractors recommend some variety of high efficiency condensing gas boiler. One contractor, however, said that high efficiency condensing boilers lose much of that high efficiency because the house has an older baseboard heating system designed for 180 degree water. He recommends a standard efficiency gas boiler which is significantly less expensive.
Is there merit to this thought?