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A gray residential water heater under ANSI Z21.10/CSA 4 repairs.
ANSI | HVAC and Indoor Environment

ANSI Z21.10/CSA 4 (Water Heaters)

ByBrad Kelechava October 24, 2017May 29, 2025

Standards within the ANSI Z21.10 (or the CSA 4) series specify guidelines for newly produced gas water heaters. These water heaters provide heating to a…

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