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Councilor: expansion tanks may cause water-meter overreads; city urged to notify residents
Summary
A councilor reported that resident tests showed up to 19% higher readings on city meters when domestic expansion tanks were connected; inspectional services told the council a backflow-preventer or check valve is required by code.
Councilor Ewen Kampen told the Somerville City Council on Tuesday that he has received multiple constituent reports alleging that home water meters can over-register usage when an expansion tank is installed on a household plumbing system and no check valve is present.
Kampen described a recent case in which a resident, an engineer who tested the matter, ran an independently validated flow meter in parallel with the city meter and found the city meter read about 19% more…
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