The installation should be regularly tested to ensure there are no leaks or other defects, and in particular where there have been any alterations to the dwelling or to the gas installations.
dylid profi’r gosodiad yn rheolaidd i sicrhau nad oes gollyngiadau na diffygion eraill, yn enwedig pan fo newidiadau wedi’u gwneud i’r annedd neu i’r gosodiadau nwy