Is it necessary, and how to properly drain the water from the boiler?

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Boiler for water heating

A boil­er is a stor­age water heat­ing tank that does a good job of pro­vid­ing res­i­dents with hot water both in a pri­vate house and in an apart­ment. Its pop­u­lar­i­ty among the pop­u­la­tion is under­stand­able: to install such a heater, you need an ordi­nary out­let with a stan­dard con­nec­tion, since its pow­er does not exceed 1.5–2 kW.

Dur­ing oper­a­tion, sit­u­a­tions may arise, for the res­o­lu­tion of which, it is nec­es­sary to drain the liq­uid from the tank. You can do this with­out resort­ing to the help of spe­cial­ists.

Do I need to drain the water from the boiler and in what situations?

  • Descal­ing. The prin­ci­ple of oper­a­tion of a water heater is sim­i­lar to a large elec­tric ket­tle: inside there is a ten or ten that heats the liq­uid to a pre­de­ter­mined tem­per­a­ture. The rate of for­ma­tion of deposits on the heat­ing ele­ment direct­ly depends on the qual­i­ty of the water in the plumb­ing sys­tem. The more of them, the slow­er the heat­ing process and the elec­tric­i­ty con­sump­tion increas­es. Even if you have good clean­ing fil­ters installed and you change them on time, you still need to descale the con­tain­er at least once every 4–5 years. If the qual­i­ty of the water is not good, clean­ing is car­ried out every year.
  • Mag­ne­sium anode needs to be replaced. This ele­ment is a met­al pin, top coat­ed with a lay­er of mag­ne­sium alloy. The anode pro­tects the tank from cor­ro­sion and reduces the amount of scale on the heaters. If you reg­u­lar­ly use the water heater, then the anode will need to be replaced in two years.
  • The boil­er is used only in the sum­mer. Water heaters are often installed in cot­tages and after the end of the sea­son it is nec­es­sary to drain the liq­uid from the tank for the win­ter, oth­er­wise the tank may fail if the water remain­ing in it freezes. If the tem­per­a­ture in the room does not drop below +5°C, do not leave the tank dry. Man­u­fac­tur­ers claim that a long stay of the device with­out water adverse­ly affects its per­for­mance.

Impor­tant! If your heat­ing device breaks down, but the war­ran­ty peri­od for it has not yet expired, in no case should you try to drain the water your­self! The cus­tomer ser­vice, in the event of your inter­ven­tion, will refuse to ful­fill its oblig­a­tions.

How to drain water from a water heater with different types of connection?

Ways to drain water from a water heaterHow fast and sim­ple this process will be depends on how the heat­ing device is con­nect­ed. Con­sid­er sev­er­al options for join­ing and the algo­rithm of your actions in each of them.



For work you may need:

  • Wrench.
  • Hose for drain­ing water.
  • Large basin or buck­et.

Stan­dard con­nec­tion type No won­der it is rec­om­mend­ed by man­u­fac­tur­ers. It is with this method to drain the water from the tank — as easy as shelling pears. The dia­gram shows all the con­nec­tion nodes, in par­tic­u­lar, it can be seen that a tee with a tap is installed between the tank and the safe­ty valve (see fig­ure under num­ber 4).

Boiler connection diagram

  1. Boil­er.
  2. Shut-off valve for the plumb­ing sys­tem.
  3. Safe­ty valve.
  4. Valve for drain­ing liq­uid from the tank.
  5. Hot water faucet in the mix­er.
  6. Cold water faucet.
  7. The mix­er itself.
  8. Stop valve.

Process descrip­tion:

  1. We dis­con­nect the device from the mains.
  2. We close the valve for sup­ply­ing cold water to the boil­er (in the fig­ure at num­ber 2).
  3. Open the tap with hot water and low­er it from the tank. We leave the valve open to relieve pres­sure in the tank.
  4. We open the tap on the tee, after putting a hose on it. We are wait­ing for the water to flow out.
  5. Now turn off the tap at the out­let of the heater (in the fig­ure at num­ber 8) and close the mix­er tap.

Draining water from the Termex water heaterThat’s it — now your water heater is emp­ty. Some­times small adjust­ments are made to the stan­dard con­nec­tion scheme. For exam­ple, a shut-off valve is not installed at the out­let of the boil­er or an addi­tion­al valve is installed on the hot water pipe to allow air to enter the tank.

In the first case, the algo­rithm of actions remains the same, but you just need to keep in mind that in the absence of a shut-off valve at the out­let of the tank, you can­not use the water sup­ply until you com­plete all the work.

In the sec­ond — after the third step in the descrip­tion of the process, you need to open this valve.

Sim­pli­fied con­nec­tion type can please the con­sumer with a quick instal­la­tion of the water heater imme­di­ate­ly after pur­chase. How­ev­er, this joy will last exact­ly until the moment when you sud­den­ly need to drain the water from the tank. Installers from com­pa­nies sin in this way of con­nec­tion: for them it is fast, for the own­er of the boil­er it is cheap.

With this method of con­nect­ing the water heater, the algo­rithm for drain­ing water from the tank will dif­fer from the pre­vi­ous one due to the fact that the unfor­tu­nate spe­cial­ists who con­nect­ed the device did not take care of installing the drain valve.

Process descrip­tion:

  1. We turn off the device.
  2. We turn off the liq­uid sup­ply valve to the boil­er, if at least it is installed. If not — a com­mon ris­er in the apart­ment.
    We open the hot tap on the mix­er: we release the water and the pres­sure in the tank.
  3. We sub­sti­tute some con­tain­er and unscrew the flex­i­ble hose to exit the hot liq­uid from the tank — an adjustable wrench will help you. We wait until water drains from it — usu­al­ly there is not much of it.
  4. We unscrew the flex­i­ble cold water sup­ply hose and open the lever on the safe­ty valve. We are wait­ing for the water to drain.

The drain time direct­ly depends on the vol­ume of the tank. For exam­ple, a con­tain­er of 80 liters will go down for at least an hour.

Water heater safety valveIt hap­pens that the safe­ty valve is mount­ed with­out a lever. Then the process of drain­ing water turns into an oper­a­tion that requires the inter­ven­tion of third par­ties.

One per­son, of course, can show the won­ders of acro­bat­ics by hold­ing a buck­et or basin with water flow­ing into it and at the same time, using impro­vised means, press­ing a spring in a safe­ty tank.

But it’s bet­ter to play it safe and invite a friend to help: talk­ing and two hours will pass faster and there will be some­one to dis­cuss the crafts­men-installers with.

In this video you can see how to quick­ly and eas­i­ly drain water from the Aris­ton boil­er:

These are the steps you will have to take in order to free the stor­age tank from the liq­uid. In prin­ci­ple, noth­ing com­pli­cat­ed when the boil­er is installed cor­rect­ly, and if not, then you now under­stand that in some mat­ters sav­ings can be not only inap­pro­pri­ate, but even harm­ful.


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