So Ruth Trimble basks in the warmth coming off her gas boiler, which a couple of years ago replaced the oil heat system in her mid-century home in Middletown, Pennsylvania.
Should there be any trouble with the boiler, the automatic controlling unit would cut off the fuel oil supply.
假如锅炉出问题的话，自控装置会自动切断燃油的供给。
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The studio also replaced windows to improve thermal performance and replaced an antiquated oil-fired boiler with an energy-efficient, propane-powered system.