Inadequate heat or
haters that do not work properly are often blamed for any kind of heating
problems. But have you ever wondered what would happen if you are not able to
turn the heating off. We have at times come across people who complain about
radiators being hot while the heating is off in combi boilers.
The combi boilers are
systems, designed to operate by using water directly from the mains and serve
you with heat on demand. As the name says ‘Combi’, these boilers combine the
functions of a conventional boiler, hot water cylinder and a cold water storage
tank. The Combi boilers have come being really popular systems that are compact
in size and are easy to install.
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.
Radiators hot when heating off combi boiler
Radiators commonly have
two basic reasons of being heated while the central heating is off. Let’s have
- Malfunctioning check value- The older types of heating systems operate to keep
the water hot all the time. Hot water from the boiler rises and flows by
natural convection up to the radiators. As soon as the heating is turned on,
the water from the boiler is pumped up to the radiators. A check valve is built
in the system in order to keep the natural convection from allowing hot water
to circulate to the radiators when the pump is off. A weight is made to keep
the check valve closed and stop the natural convection from occurring. If in
case the check valve fails because of a broken spring or some scrap, the
radiators would be hot from the natural convection, even if the heat is off.
- Diverter problems- These problems arise in case of the modern heating
systems. Most of the modern heating systems have temperature sensitive switches
in the form of thermostats that operate to turn the boiler on when heat is
required in any form. Either the room
thermostat or the water cylinder thermostat calls for heat when the boiler
turns on. The diverter valve then directs the hot water to the radiator or the
water cylinder as needed. And if in case both the thermostats call for heat at
the same time, the diverter holds itself into a mid-position that allows the
hot water to flow to both the water tanks and the radiators.
If in case the diverter fails or gets blocked
anyhow, the hot water intended for the hot water circuit would move to the
radiator circuit and this would probably happen to keep the radiators hot even
when the heating is off.
Note- In both the cases, we would
recommend you to fall for a professional help in order to solve the issue with
causing any harm.