Source: https://chicagoplumbingcode.com/chapter-18-29/article-5/18-29-501/
Timestamp: 2019-04-18 22:26:48+00:00

Document:
The provisions of this article shall govern the materials, design and installation of water heaters and the related safety devices and appurtenances.
Each heated water storage tank shall be provided with a sludge drain pipe which shall be connected at the lowest level of the bottom section of the tank. This drain shall be provided with a control valve with a clear waterway equal to the area of the sludge drain pipe, and shall discharge through an indirect connection into the drainage system of the building. Drain valves shall conform to ASSE 1005.
§ 18-29-501.4 Location for access.
§ 18-29-501.5 Water heater labeling.
All water heaters shall bear the label of an approved agency. Listing by Underwriters Laboratories, American Gas Association (AGA), National Board of Boiler and Pressure Vessel Inspectors, or the ASME Standard to which it was constructed, shall constitute evidence of conformance with these standards.
§ 18-29-501.6 Tankless water heaters.
The temperature of water from tankless water heaters shall be a maximum of 140F (60C) when intended for domestic uses. This provision shall not supersede the requirement for protective shower valves in accordance with Section § 18-29-424.4.
Indirect, external, tankless or submerged coils used in heating water shall be equipped with a thermostatic mixing valve or valves when not connected to a storage tank. A pressure relief valve or expansion tank shall be installed on the cold water inlet to the heater. A temperature and pressure relief valve shall be installed on the tempered line with the temperature sensing element immersed in the tempered water pipe as close as possible to the mixing valve.
§ 18-29-501.7 Pressure marking of storage tanks.
Water heaters of 200,000 BTU input per hour or more and storage tanks of 120 gallons (454 L) capacity or more shall be constructed in accordance with ASME Boiler and Pressure Vessel Code, Section IV.
All hot water supply systems shall be equipped with automatic temperature controls capable of adjustments from the lowest to the highest acceptable temperature settings for the intended temperature operating range. Multiple temperature hot water supply systems shall be provided with thermostatic mixing valves to control the desired temperatures.
§ 18-29-501.8.1 Instantaneous water heaters.
Direct fired instantaneous water heaters shall be equipped with a thermostatic mixing valve or valves. A pressure relief valve shall be installed on or adjacent to the heater. A temperature and pressure relief valve shall be installed on the tempered line with the temperature sensing element immersed in the tempered water pipe as close as possible to the mixing valve.
Chemicals and additives used to treat the boiler feed water in this boiler are not approved for potable water. The steam or hot water produced by this boiler is not potable. If the steam or hot water produced by this boiler is used to heat water, the water will not be considered potable if the steam and potable water are mixed.

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