Notice will be given, whenever practicable, prior to shutting off water, but consumers are warned that owing to unavoidable accidents or emergencies their water supply may be shut off at any time. All persons having boilers on their premises depending on connected pressure with the water mains, are cautioned against collapse of their boilers. As soon as water is turned off, the hot water faucet should be opened and left open until the water is again turned on. A check valve must always be placed between the boiler and the city water department's mains to prevent draining the boiler. No premises shall be left with any faucets open and water turned off. (Ord. 168, 1-15-1923)