Well if you have a combi
boiler that only works when heating is on, then you need to think about it. But
before that you need to know about combi boilers and how they work.
What are combi boilers?
Combination boiler or
combi boilers come being one of the most common types of boilers used in UK for
a reason. Unlike the system and conventional units, the combination boilers are
designed to be an all in one unit which produces hot water for taps and central
heating in order to cut down the use of storage tanks or cylinders, thus
occupying the least space required to house the boiler. Additionally on a
comparison, the installations are much easier and faster than any other boiler
The combi boilers
operates by using the water from the main supply that results in stronger water
pressure and ensures that you would never be lacking on hot water again. The modern
highly efficient units come, being a stainless steel condensing boiler with an
inbuilt heat exchanger that operates in order to serve the customers with hot
There are two main
reasons behind the combi boilers great and powerful efficiency i.e. these units
have high operating efficiency and low internal water volume. This means when
in summer days you don’t need space heating you are only paying to heat water
which is domestically required.
Now that you are clear
about what a combi boiler is, you need to learn about how it works.
How combi boiler works?
Combi boilers are designed
to be manufactured with two independent heat exchangers, one of which carries a
pipe to the radiators while the other one carries a pipe to the hot water
supply. As soon as you turn the hot tap on, your boiler fires up to heat water
and a valve gets opened to let the water flow through the network of pipes.
A combi boiler will
usually require to pause from heating the central heating water for your
radiators while it’s heating the hot water for your tap, because they are often
not build to supply enough heat to both the points at the same time. For this
reason, you might hear your boiler switching on and off when you run a hot
water tap even if they’re already lit to power the central heating.
You might be wondering about the reason behind your combi boiler
hot water working but only when the heating is on.
Combi boiler hot water only works when heating is on
If your central heating
system works perfectly yet there is no hot water it means that your hot water
works but only when your system is working and you need to clearly look upon
it. In this case it could clearly be an issue with the diverter valve that
might be faulty or be stuck in the central heating position.
What is a diverter valve?
A diverter valve is a valve
that opens and closes to allow the hot water to travel either to the radiators
or to the domestic hot water systems. A diverter is required in order to direct
the water flow out of either the taps or the showerheads. The diverter valve is
a mechanism found in the combi boiler system that is meant to control the flow
of water through your home’s radiators.
You might be wondering where
the diverter valve on a combi boiler is. The diverter is the part of the tub
spout. The diverter handle simply pulls straight up to send all the water from
the tub spout to the radiators or the shower heads.