hot water systems need to be drained in order to prevent the pipes from freezing during a prolonged cold
weather power failure. It might also be necessary to drain the system in order
to make repairs.
Draining more than one radiator has always been a good idea
in case you want to drain the complete central heating system in order to
ensure there is no chance of any water leaking out. Though some of the boilers
are not made to work during this period. On comparison with the conventional
heating system, a combi boiler would just require itself to get simply off and
start draining once the water cools down.
Before learning on how to drain your central heating system
combi boiler, it is highly recommended to switch your boiler off as it will
allow the potentially scolding water to cool down and would eventually prevent
you from any getting any harm, thus ensuring your safety.
Warning- Draining or flushing isn’t something you should
attempt yourself unless you don’t have the relevant knowledge or skills to so
properly and safely.
How to drain a
central heating system combi boiler?
We have mentioned a few simple steps on how to drain your
central heating system to make your radiators run efficiently.
- Locate radiators with drain off valve- To begin, locate the radiators somewhere downstairs
at your place and attach a long piece of hosepipe to the drain- off- valve
using a clip. Though you can avoid the use of a clip if your piece of hosepipe
comes strong enough to hold it on but it is advisable to use the clip as it can
stop the hosepipe from slipping off and also prevents the dirty water from
spilling out all over the floor.
Be sure on your pipe to be long enough to reach
outside the property for the water to drain out, however avoid draining the
water on plants for the chemical applicants in the water can appear to be
harmful for them.
- Drain radiators thoroughly- Make sure all the radiator valves in the house are
open before opening the valve of the radiator that is attached to the hosepipe.
Once you enclose the valve of the radiator that is attached to the hosepipe the
water will automatically start draining out. In case you want the water to
drain out more quickly, it is recommended to open the bleeding valves of the up
stair radiators that owns a separate point for description.
- Open the bleed valves- Once you open the bleed valve wait for around 15
minutes for the water to drain out. After this, try opening the bleed valve on
any one of the radiators slowly. If you find the water coming out, quickly
tighten the bleed valve back and wait for another 10 minutes.
As soon as you hear the sound of air being sucked
into the system, you can feel safe to fully open the bleed valve and do the
same to all the other radiators.
This is done in order to make sure that even the
last remaining bits of water are out of the system.
- Finish up the draining process- Once you are confident about the water being completely
out of the system, go back around the entire radiators and tighten back all the
Close the valve of the radiator attached to the
hosepipe and remove the clip to takeoff the pipe.
Tip– Be aware of the little water
waiting in the hosepipe, to split off as soon as you takeoff the pipe. Prepare
a container to avoid spilling out.
are successfully done draining your system.