Procedure for disassembling the boiler for cleaning and repair
Central nut at 55
If you need to disassemble a water tank, in which the heating element is fixed below with a large hexagonal nut, as in the photo below, you can do everything quickly.
First of all, disconnect the boiler from the mains and water supply. Before unscrewing the flexible hoses, be sure to shut off the cold water supply. After disconnecting, you need to drain the water from the water tank, which can easily be done according to this video instructions:
When the water is drained, you need to disassemble the bottom cover of the water heater body, which is usually attached to 2 screws. Under the cover you will find this large nut and thermostat, which also needs to be removed by disconnecting the suitable terminals. Now that you have free access to the nut, take a gas wrench No. 2 or a wheel spanner at 55, both can be seen in the photo:
Unscrew the heater for self-repair is necessary counterclockwise. To make it more convenient to completely disassemble the storage boiler with your own hands, remove it from the wall and turn it upside down. When the nut is unscrewed, carefully remove the heater by rocking it slightly from side to side.
Since, after draining the water from the tank, a small part of it can remain inside, it is recommended that when disassembling, substitute a bucket under the boiler so that the rest drains into it, and not onto the floor. And another tip - if the scum will interfere with the removal of the heating element, using a solid non-metallic object, try to slightly clean the hole and the heater itself.
If you have a newer water heater, then its design will be different. In this case, the heater can be removed by unscrewing the clamping plate. The peculiarity of disassembling the case of such a model is that in no case can you disassemble the boiler by turning it upside down, as the “wizard-master” shows in this video:
You yourself see that after disassembling the heating element fell into the tank, which is covered with enamel, so that the tank does not rust from the inside. Of course, when a metal hits a metal, both the heater and the internal coating of the water heater, which cannot be repaired by itself, can be damaged.
Proceeding from this, in order to disassemble the storage water heater with an oval flange, it is necessary to do everything without removing the boiler. Assembly of the product is carried out in the reverse order.
Bolts in a circle
A fairly popular design, which is found among Termex, Ariston, Polaris and Combustion heaters, is the fastening of the heating element flange with bolts in a circle. These bolts can be 4, 5 or 6, depending on the model.
In order to disassemble an electric boiler of this type, it is necessary, as in previous cases, to disconnect the power from the network and drain the water. After that, it is better to unscrew the check valve, which may interfere. One of the frequent difficulties that arise when a heater is completely disassembled with one's own hands can be the search for screws that secure the plastic cover. If you cannot find the mounting location, tear off the stickers located on this cover. Sometimes manufacturers hide hats of self-tapping screws precisely under the "nameplate".
When you dismantle the thermostat and all interfering wires, you can begin to untwist the bolts on the water heater. They are best twisted with a socket wrench of the appropriate size.
By the way, Ariston in some of his storage boilers of this design does not use bolts, but rather nuts that are screwed onto the studs, as shown in the photo above.
In more expensive models of water heaters, when completely disassembled, you can see a bunch of wires and 2 heating elements installed next to each other. You can disassemble such a device by analogy with the previous instructions, however, we recommend that you photograph the correct connection of all the wires before disconnecting them, so as not to get confused and quickly assemble the tank.
A device with a dry heater can be disassembled exactly by the same methodology, so you should not have questions about how to proceed.
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