The Eemax Electric Mini Tank Water Heaters, including models EMT1, EMT2.5, EMT4, and EMT6, are designed to provide hot water solutions for various point-of-use applications. These compact and lightweight electric water heaters are suitable for residential, commercial, and industrial environments, specifically for hand wash and kitchen sinks. They offer an efficient alternative to traditional central hot water heaters by conserving water and reducing energy waste. Additionally, they can be plumbed in series with a central water heater to act as a booster, enhancing the overall hot water system.
Function Description:
The Eemax Mini Tank Water Heaters operate by heating water stored within a welded, glass-lined steel pressure vessel equipped with an anode rod. Each unit features a thermostat for automatic temperature control and a high-limit temperature switch for safety. When the water in the tank is below the desired temperature, a red indicator lamp illuminates, signaling that the water is being heated. Once the set temperature is reached, the lamp turns off. The water heaters are designed to operate at a maximum water pressure of 150 psi, and a pressure reducing valve should be installed if the incoming water pressure exceeds this limit. A temperature/pressure relief valve (T/P valve) is supplied with each unit to prevent excessive pressure buildup. This T/P valve is certified by a nationally recognized test lab and meets the requirements for relief valves and automatic shut-off devices for hot water supply systems. The heater is equipped with an overheat limiting device with a manual reset, which interrupts power to the heating element if water temperatures exceed 190°F, acting as a safety shut-off mechanism.
Usage Features:
Installation of the Eemax Mini Tank Water Heaters is designed to be straightforward, with models intended for wall mounting or placement on the floor, typically under a sink. They must always be installed in a vertical position. The units come with a mounting bracket and require appropriate screws for secure wall fastening, considering the weight of the water heater when filled to capacity. Plumbing connections involve connecting the cold water inlet pipe to the nipple marked with a blue ring and the hot water outlet pipe to the nipple marked with a red ring. Dielectric connections are recommended if water pipes are copper or bronze to prevent corrosion. A shut-off valve on the cold water side is essential for servicing. The T/P valve must be installed into the threaded opening at the top of the water heater, with its discharge pipe terminating at a sink or drain. This discharge pipe must be unobstructed, full-sized, and not capped or plugged.
Before connecting the power, it is crucial to ensure the tank and system are completely filled with water and all air is removed. This is achieved by opening hot water faucets on fixtures until a continuous flow of water is observed, preventing damage to the heating element. The water heater is designed for 110-120V electrical service and must be connected to a properly grounded outlet using the supplied power cord. An extension cord should not be used.
The thermostat allows for adjustable temperature control. Users can increase the water temperature by turning the knob clockwise and decrease it by turning it counter-clockwise. For extended periods of non-use, energy can be conserved by reducing the water temperature setting. A "Freeze Protection" position on the thermostat knob is available to keep the internal water temperature above freezing, which is useful when the water heater is not in use for a long time and there is a risk of freezing. Alternatively, the unit can be unplugged and drained.
For the EMT1 model, a 0.5 GPM faucet-mounted aerator is supplied and highly recommended. This aerator restricts water flow, allowing the 1.3-gallon capacity to provide hot water for a longer duration.
Maintenance Features:
Regular maintenance is essential for the longevity and efficient operation of the Eemax Mini Tank Water Heaters. Users are advised not to attempt repairs themselves but to contact a licensed professional (plumber or electrician) for service. Before any servicing or draining, the power switch must be turned off, and the power cord disconnected from the electrical outlet.
Draining the water heater involves unplugging it, opening a hot water faucet until the water is no longer hot, turning off the cold water supply, closing the hot water faucet, and disconnecting the unit from both hot and cold water connections. Remaining water can be siphoned out, and the heater can be tilted to drain completely.
The heating element may require descaling due to mineral deposits, which can affect heating capability and even cause burnout. Descaling can be done chemically by soaking the element in white vinegar or a descaling solution, followed by rinsing with fresh water. Alternatively, manual descaling involves letting the element dry and then brushing off residue with a non-metallic brush, taking care not to damage the surface. After descaling, the element and gasket should be reinstalled, and the tank refilled with water before restoring power.
Replacing the heating element involves turning off power, unplugging and draining the unit, removing the cover, disconnecting wires from the element, unscrewing retaining nuts, and then removing and replacing the element with a new one and gasket. Wires should be reconnected to their original locations.
The thermostat can also be replaced. This process requires turning off power, unplugging and draining the water heater, removing the bottom panel by unscrewing six screws, removing the thermostat knob and its two retaining screws, disconnecting push-pull wire connectors (noting terminal connections), removing the thermostat probe from its well, and then installing the new thermostat, attaching wires, and tightening screws.
The high-limit safety shut-off switch may occasionally activate if water temperatures exceed 190°F, automatically cutting power to the heating element. This can occur due to power outages or electrical storms. To reset, the water heater must be allowed to cool down. Then, the power switch should be turned off, the unit unplugged and drained, the bottom panel removed, and the small red button in the center of the junction box depressed. The bottom panel is then replaced, and the water heater returned to service. Frequent resetting of the high-limit switch indicates a potential issue that requires a technician's attention. A lower temperature setting is also recommended to save energy and reduce the risk of scalding.
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