We drain the water from the boiler: standard and simplified version


There are sev­er­al sit­u­a­tions when liq­uid must be removed from the water heater. But how to drain the water from the boil­er pain­less­ly for the own­ers, because just open­ing the valves will not be enough. In addi­tion, it is impor­tant to take into account the vari­ety of types of con­nec­tions.

When should water be drained?

There are sev­er­al main points when it is nec­es­sary to remove liq­uid from an elec­tric water heater.

First­ly, at least once a year it is nec­es­sary to clean the inter­nal tank from scale and large ele­ments that could get inside through the cold water pipe. This will great­ly extend its ser­vice life. Oth­er­wise, prob­lems may appear with­in a few years after the start of use.

Sec­ond­ly, the device may fail. And it will be pos­si­ble to return its per­for­mance only after drain­ing the inter­nal flu­id.

Third­ly, this issue is rel­e­vant for own­ers of coun­try and coun­try hous­es in which they do not live per­ma­nent­ly. It is nec­es­sary to drain water from the equip­ment and the entire sys­tem when the room tem­per­a­ture drops to +5 degrees and below. The fact is that in win­ter there is a high prob­a­bil­i­ty of freez­ing of the liq­uid, which will lead to a rup­ture not only of pipes, but also of all con­nect­ed equip­ment, includ­ing the tank.

Impor­tant! In the case when the tem­per­a­ture exceeds +5, you can not drain any­thing. The fact is that many man­u­fac­tur­ers do not rec­om­mend emp­ty­ing con­tain­ers and then leav­ing them unused for a long time. Under such cir­cum­stances, cor­ro­sion devel­ops faster, affect­ing the tank.

How to drain water from the heater with different types of connections?

Be sure to say that before start­ing the pro­ce­dure, the boil­er is dis­con­nect­ed from the elec­tri­cal net­work. Oth­er­wise, you can not only burn your­self, but also get an elec­tric shock.

Standard type of connection

The usu­al way to con­nect the unit is to con­nect two taps to a pipe with cold water. At the same time, the one clos­est to the boil­er has an out­let in the form of a tube or hose. In addi­tion, a shut-off valve is mount­ed on the hot pipe.

The order of drain­ing is as fol­lows:

  1. The inlet water tap is closed.
  2. Through the mix­er, the rem­nants of the hot liq­uid in the pipe are released.
  3. Next, the sec­ond shut-off valve for cold water and shut-off opens. Through an addi­tion­al pipe, every­thing is drained from the tank.
  4. After remov­ing every­thing from the sys­tem, close the shut-off valve.

Standard #2

This con­nec­tion is prac­ti­cal­ly the same as the first one. The only thing is that there is no cut-off com­po­nent to pre­vent water from enter­ing the heater through a mix­er.

In this case, you need to be care­ful. So, for exam­ple, the unit is locat­ed in the bath­room. Water is drained from it in the same way. At that moment, some­one sud­den­ly want­ed to turn on the hot tap in the kitchen. The liq­uid through the mix­er enters the open pipe, which can lead to a flood. Such laugh­ter is often used when con­nect­ing. You just need to be care­ful when dis­as­sem­bling the sys­tem.


This con­nec­tion option is main­ly used by ser­vices that install water heat­ing sys­tems on behalf of the sell­er com­pa­ny from which the equip­ment was pur­chased. The device in this case is mount­ed in just a few hours and the cost of work is low. A safe­ty valve is installed direct­ly into the boil­er, and a tap and a pipe with cold liq­uid are con­nect­ed to it. Hot water is avail­able and every­one is hap­py.

But with planned clean­ing or break­down, prob­lems begin. How to drain the water from the boil­er with this con­nec­tion? For this you need:

  1. Shut off cold sup­ply.
  2. Through the near­est mix­er, remove the remain­ing hot.
  3. Open the check­box on the safe­ty valve, through which the drain will be per­formed. In the mean­time, a lot of time will pass.

It is impor­tant to remem­ber that air must enter in order to get rid of water. From the mix­er, the right amount will def­i­nite­ly not get into the unit. There­fore, you have to unscrew the pipe with hot water. Of course, you can try to blow into the mix­er, as some “experts” advise, but most like­ly this will not help.


In this case, the con­nec­tion is used, as in the sim­pli­fied ver­sion, only there is no flag on the valve. With such a con­nec­tion, it will be most dif­fi­cult to remove water. Need:

  1. Shut off cold.
  2. Drain the remain­ing hot through the mix­er.
  3. Dis­con­nect hoses.
  4. The valve should not be twist­ed, as it may require addi­tion­al seal­ing in the future. There­fore, it is nec­es­sary to open the hot and cold taps on the heater and, through the lat­ter, con­stant­ly press on the fuse spring. This is a long but safe process.

Impor­tant! Before doing this, it is advis­able to allow the liq­uids inside the equip­ment to cool for sev­er­al days to avoid burns.

The most comfortable

There is a con­nec­tion that allows you to quick­ly and eas­i­ly drain the water from the boil­er. To do this, it is nec­es­sary to screw a tee to the cold water inlet on the heater. A shut-off valve is attached to one out­let. A safe­ty valve is installed on the sec­ond, after which there is a mech­a­nism that shuts off the sup­ply. Almost the same sys­tem is installed on hot water. The only thing is that you don’t need a valve.

There are many ways to con­nect a con­ven­tion­al boil­er in the sys­tem. Many users often choose sim­ple ways. True, when it comes time to car­ry out sched­uled clean­ing, prob­lems begin with drain­ing the water.


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