How to properly drain the water from the water heater tank
For the boiler to last a long time, you need to clean it from time to time. This requires completely draining the water heater. Also, the tank is emptied in case of seasonal use, repair work. If you understand how to properly drain the water from the boiler, you do not have to spend a lot of time on this.
The need to drain depends on the operation mode, contamination of the tank, its design features.
- Seasonal use, for example, at the cottage. With the onset of winter cold weather, the liquid can freeze and “tear” the internal storage tank.
- Water main breakdown or interruption of centralized water supply. The drained water can be used for household purposes or pour it into the cistern of the toilet bowl.
- Need for cleaning and repair. Flushing is inevitable, if cleaning of the tank and a heating element from scale, replacement of a magnesium anode, correction of electric heater failures.
For a unit that stands in a room with heating, to drain the liquid during the absence of the owners is not necessary. But it is necessary to consider the design features of the water heater. No problem with a stainless steel tank, but for copper heating elements the liquid inside is dangerous. Destruction of this metal in hard water is faster than in air saturated with moisture.
If the liquid for the heating device is drawn from the central water system, due to the disinfecting components it will not go bad for a long time. Well water comes without chlorine. Therefore the risk of bacterial development and stagnant odour is higher. To avoid this, the tank is emptied.
Do I have to drain the boiler and in what situations??
Important! If your heating device is broken, but the warranty on it has not yet expired. in no case do not try to drain the water yourself! The service company, if you intervene, will refuse to fulfill its obligations.
When to drain popular reasons
A water heater tank needs to be completely drained if the room where the equipment is located is not heated for a long time. For example, this may be a dacha, not adapted for winter residence, or any other property rarely visited by the owners, where the average temperature drops below 5 ° C.
Under such conditions, the water in the storage tank and pipes can freeze and there is a risk of damaging the internal structure of the tank and the piping. Therefore, it is better to carefully drain the liquid in advance, and the system itself to mothball until a more suitable time.
If the boiler in the warm season is not planned to use as intended for a long time, you can not drain the water completely, but just once every 15 days to let it leak and refresh. Then the water will not stagnate, and an environment that is comfortable for various microorganisms cannot physically form inside
If you do not intend to use the unit for a long time, you can refresh the contents once every two weeks by opening the hot water tap on the faucet for a few minutes. That way the water does not stagnate and harmful microorganisms do not accumulate.
Scheduled cleaning is another good reason to completely empty the boiler. It is carried out once a year where there is a centralized supply of highly purified water containing a minimum of impurities. Twice a year the tank is cleaned with constant use of flowing water that enters the system directly from the tank and does not go through the treatment headers.
When the heating element is covered with a thick layer of scale, the water heater begins to consume significantly more electricity in the process. According to observations by experts, the flow increases by at least 25%, and in some especially neglected cases up to 50%
In addition, during operation inside the boiler dirt and harmful bacteria accumulate, and the bottom, walls and the heating element are covered with limescale. Settling on the heating element, it becomes a kind of insulator.
Then the situation is as follows: the appliance itself heats up strongly in the process of operation and begins to overheat. Flowing water in this case does not change the temperature and comes into the system barely warm.
A water heater that is too clogged with wastes generated during operation will not function properly. The load on all key components increases and the equipment wears out much faster than the manufacturer claims
The efficiency of the unit drops to a minimum with heavy electrical consumption. To fix the problem, you need to flush the tank, take out the heating element and clean it from the scale. Then in the near future the technique can fully operate and will not need to change the water heater completely for a very long time.
Sediment, formed in the process of work in the storage tank negatively affects the quality of water heating and impairs its full-fledged passage. In order to return the device began to function properly, you will have to completely drain the liquid, gently remove all deposits and only then continue to operate in normal mode
Emptying the tank may be required when the unit has already passed the warranty period, but any of the working components is broken. For independent repair or replacement of the heating element or magnesium anode will have to completely drain the water, make all necessary repairs, then reconnect the equipment to the system and fill with fresh water.
If there is a leak, it also needs to be drained. Otherwise, to find the vulnerable place and fix the problem will be very problematic not only a home master, but also a professional of his craft
Another serious reason to drain the water is an unpleasant odor emanating from the tank. It usually appears with very infrequent use of equipment. Water in the tank without regular renewal will stagnate, begin to silt and smell. After complete emptying and filling the tank with fresh liquid, the “smell” disappears and no longer bothers the tenants with unpleasant vapors.
To lime sediment does not remain inside the tank, preventing the perfect operation of the safety valve, some manufacturers of home appliances recommend that customers drain a small amount of water each month through a separate drain tube
In addition to all of the above reasons, it may be necessary to empty the tank when it is removed and relocated, for example, during room remodeling and ongoing major or cosmetic repairs.
When not to drain the water
In some cases, it is not advisable to drain the boiler, as this can do more harm than good.
At prolonged standstill
Accumulation water heaters take a long time to heat up and cool down, so you should only drain if you can not do without such an operation. If the tank is idle for a long period of time, no draining can be done, provided the tank is plugged in. The presence of a magnesium anode will perfectly protect the unit against corrosion, while the lack of movement will cause the stiffness to be greatly reduced. All these factors will prolong the life of the device, because when you drain the tank will still be very humid atmosphere inside, which can lead to the destruction of the metal tank.
Do not be afraid of the high electricity consumption during standstill periods. If there will be no withdrawal of hot liquid, to maintain the temperature at a predetermined level, the boiler of average capacity consumes no more than 1 kW of electricity per day.
The procedure for draining the water from the boiler
Drain the heater fluid is considered a simple procedure, but it is not recommended to carry out it without studying the instructions. Each brand may have its own differences.
Most often, according to the rules of operation, the manufacturer does not allow intervention in the system until the end of the warranty period. If the heater has a complex design, you should not disassemble it yourself to prevent breakage.
The standard connection type is recommended if a tee with a faucet is installed on the pipe section from the heater to the fuse valve. The liquid from such a system is drained simply, without the use of additional tools.
The scheme of the standard connection is as follows:
- water faucet;
- Safety valve to prevent the backflow of liquid from the system;
- tee designed for drainage;
- tap for hot and cold water;
- shut-off valve for shutting off the hot liquid.
If the entire connection scheme is observed, it will take no more than 10 minutes to drain:
- The boiler is disconnected from the mains, the liquid supply is shut off.
- Hot water is opened and drained from the pipe through the faucet. Leave the tap open during draining to allow air to flow into the system.
- The drain hose is put on, the drain cock is opened.
- Once the tank is completely empty, the shutoff valve is shut off.
If air is slowly entering the system, it may take several hours to drain. To remedy the situation, you can connect a compressor to the hose. It will pump air into the system. The boiler can only be plugged in once it is completely filled.
Improved connection type
With this connection scheme, the tee is installed on both sides: at the water inlet and outlet. To drain the water in such a water heater, it is necessary to perform the following actions:
Draining a water heater
The hose is routed into a previously prepared container and the air supply tap is opened.
Simplified method of connection
The procedure for draining by the simplified method is as follows:
- the liquid supply to the tank is shut off;
- the remaining hot water is discharged from the hose by opening the faucet;
- Turn the flag on the safety valve to drain.
The difficulty of this method is the duration of the process. To drain quickly, it is necessary to ensure air flow into the tank. From the faucet it practically does not pass. The problem can be solved by removing the hot water nozzle.
Removal of water in emergency mode
Often there are situations where you need to drain the liquid from the heater quickly. In this case, you need to act as follows:
- the cold water supply is completely blocked;
- the warm water in the boiler is opened;
- The pressure inside should be compared with the external pressure;
- the hose is retracted;
- A tee with a discharge valve is opened.
It is obligatory to prepare containers for collecting liquids in advance.
Drainage of residual water
The design of the boiler makes it difficult to completely drain the liquid. Some of it still remains inside. To drain the water from the heater completely, you must do the following
- The main volume is drained by any of the methods;
- At the bottom of the tank unscrew the decorative cover, then disconnect the connection to the indicator lamp;
- Electrical wires are disconnected;
- The flange is unscrewed clockwise, it is required for the heating element support;
- It is necessary to remove the heating element from the tank very carefully not to damage the walls.
There may be a large build up of scale on the heating element which will prevent it from leaving the tank. If you feel resistance in the process, you need to move the part carefully from left to right.
Whether it is necessary to drain the water from the water heater?
over, draining the water is even undesirable.
In contact with air, or more precisely with the oxygen it contains, metal parts, especially damp ones, begin to rust quickly.
Protection in the form of a magnesium anode in this case is absolutely useless, because it can effectively behave only in the aquatic environment. Thus, the service life of an appliance from which water is frequently drained will be very short.
There are, however, cases where you can not do without draining the water. But if the warranty period for the boiler is not over yet, you should not do it yourself. This operation, as well as the repair, must be carried out by a service technician. If you still try to take this honourable responsibility, the matter may result in the refusal of warranty repair. It is no secret that sellers and service workers are trying to use for this any, even the most insignificant occasion, and your self-activity will play into their hands.
Well and if the warranty does not operate any more, you can bravely take out your tools: your hands are untied, and nobody will be able to reproach you for your initiative.
Some users try to empty the boiler after a long downtime (standing water becomes musty). There is no need to do this. Through the boiler enough to pass about 100 liters of clean water, and the unpleasant smell disappears.
Using the water heater in the country
All of the above boilers are storage, in other words, they maintain a set temperature at the device all the time. If such equipment is used in a dacha, where the room is not heated in winter, the water from the tank must be drained. If this is not done, the water can freeze inside the tank, and when it freezes (everyone knows), the volume increases, and the equipment will simply burst from the inside. Therefore, draining the water in the dacha during the winter is quite a necessary measure.
If you visit the dacha site with enviable regularity, then drain the liquid from the tank is not necessary at all. It is enough to leave the tank on at a certain temperature, and the high thermal insulation of the device will allow you to use hot water immediately upon arrival, instead of waiting about 4 hours for the water to heat up. However, it will significantly increase power consumption.
Instances when you definitely need to drain your water heater
Pump liquid out of the tank in cases of obvious need:
- Boiler stays for a long time in an unheated room. Liquid can freeze and simply rupture the tank, expanding as it crystallizes. In addition, it is necessary to drain the water not only from the water heater, but it is desirable to empty the entire piping system in such a room.
- The factory warranty has expired, so all necessary repairs and maintenance must be performed by yourself. Such cases when it is really necessary to drain the water from the water heater for prevention are: cleaning the tank and the heating element from scale, replacement of the magnesium anode, elimination of electric heater breakdowns.
How to drain the water from the boiler
Units may vary structurally, but the water drainage sequence is the same for all types of boilers. An emergency drain must be arranged already at the installation stage. To the cold water spigot on the boiler are attached a ball valve and a tee with an outlet, many simplify this construction, conducting to the device spigot not a pipe, and a hose, which is also used to drain.
Since the cold water branch pipe is short, and its upper part is at the lowest level, the drain is made through the cold circuit. It is desirable to set a low heating temperature in advance, and after disconnecting from the power supply let the boiler cool down. The algorithm of action is as follows:
Shutting off the cold water tap for the entire circuit.
How to Drain & Flush a Hot Water Tank | Repair and Replace
Draining hot water by opening the appropriate tap on the faucet (usually a few liters).
This was the preparatory phase. Now, depending on the design of the boiler supply, we proceed directly to the drain. Unscrew the bottom nut of the hose connected to the heater and direct the end into the drain. To ensure that air flows into the tank, and thus a steady stream, open the ball valve on the hot side at the boiler inlet.
When the main volume is drained through the cold connector, quite a lot of water remains in the tank, it drains only after dismantling the bottom flange where the heating elements are installed.
The final stage of conservation is to remove dirt, limescale, turn off the hydraulic supply lines and dry the surface.
Many models have a built-in mode “Bio”, so the question whether to drain the water from the boiler when the device is not working for more than 1-2 months is not relevant. When the heater is not used for more than 3 months, it is necessary to renew the water by turning it periodically on the flow. When the boiler is used for a limited time, e.g. only during the summer season, the canning process must be complete: draining to dryness, drying, oxygen supply. These terms are shifted by a third if the water used is not chlorinated.