Installation of Water Heater in Container House

When installing a water heater in a container house, comprehensive considerations must be given to aspects such as model selection, pre-installation preparations, water circuit connections and safety device installations, and other precautions to ensure safety and practicality.

Model Selection

Mainstream water heaters are divided into storage-type and instantaneous-type. Storage-type water heaters have low circuit requirements, generally requiring a 16A socket and wires with a cross-sectional area of over 4 square millimeters. They have strong installation adaptability and stable hot water supply, but they are bulky and have a preheating waiting time. Instantaneous-type water heaters provide hot water instantly upon turning on, are compact in size, save space, and require no waiting time. However, they have high circuit capacity requirements, with instantaneous power typically ranging from 3000W to 8500W. If space is limited and the circuit has been professionally modified to meet high-power demands, an instantaneous-type water heater can be considered. If simplicity of installation, cost control, and electrical safety are pursued, a storage-type water heater is more reliable.

Pre-installation Preparations

• Location and Wall Reinforcement: The installation location should be well-ventilated, close to the main water consumption points, and convenient for operation and maintenance. The bottom of the electric water heater should be kept at a height of 1.2 to 1.5 meters from the ground. The wall panels of container houses are mostly non-load-bearing structures and cannot directly support heavy objects. It is necessary to locate the internal crossbeams for fixation, or install special transition brackets or back panels. Alternatively, a hole can be made using a hole saw to pass through bolts, with a gasket added on the outside and a hanging plate installed on the inside.
• Circuit Safety: For instantaneous-type water heaters, a dedicated copper core wire with a cross-sectional area of not less than 4 square millimeters must be laid separately. Storage-type water heaters generally also require wires with a cross-sectional area of over 4 square millimeters, and the capacity of the electricity meter must be checked to ensure it meets the requirements. A leakage protection circuit breaker with a matching rated current must be installed, and a dual protection system of a "leakage protection circuit breaker + anti-electric shock wall" is safer. Effective grounding must be completed strictly in accordance with regulations, with a grounding resistance of not more than 4Ω. Priority should be given to connecting to the original ground wire of the building. If this is not possible, a galvanized expansion bolt with a depth of not less than 10 centimeters can be driven into a damp area as an artificial grounding electrode.

Water Circuit Connections and Safety Device Installations

When connecting the inlet and outlet water pipes, they should be tightened and fixed. It is recommended to use Teflon tape to ensure tight sealing of the interfaces and prevent water leakage. Before installation, it is recommended to test the water circuit pressure. The normal water pressure should not exceed 0.7MPa. If the water pressure is too high, a pressure reducing valve should be installed at the water inlet. A safety valve must be installed and correctly connected at the cold water inlet of the water heater.

Other Precautions

The water heater should not be installed in locations with strong air convection (such as window openings) and should be surrounded by no combustible materials. It should not be installed inside a "box", even if it is a louvered box. The installation of air-source water heaters involves an outdoor unit and a water tank, requiring high installation skills. Professional personnel are usually needed for pipeline laying and wiring. The control panel should be installed in a location that is convenient for operation and close to the main unit. Installation should comply with relevant national standards.