I am having a new kitchen which will mean that the radiator in the
kitchen will have to be moved. As there isn't a good place to relocate
it too I would like to install a plinth heater fed from the central
heating system. The easiest connection for this would be to pipe back
about 1.5 metres then into a stud wall where I could connect it onto
another radiator the other side of the wall, feed to feed and return to
return. My questions are is this feasible? or do I have to install pipe
upstairs back to the main feed and return pipes. Also is it OK just to
blank off the pipes in the wall af the radiator beinf removed? The pipes
at the radiators are 8mm.
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Do bear in mind that the fans in these can be quite noisy if the room
is otherwise quiet.
It *may* be feasible to do this.
There's no problem with blanking off the old feed and return pipes.
It *may* be OK to connect to the back of the other radiator. The
catch is in the total flow available through the pipes from the main
feed and return. When 8mm pipe is used it is typical to connect
all radiators manifolds, but not always.
The issue is that 8mm pipe is only capable of delivering the flow
required to transfer about 1500W of heat at typical pipe lengths in a
house. If the system was designed properly, then the radiator(s)
should have capacities below this - or more to the point, the
radiators should be sized to compensate the heat loss from the room in
the coldest weather (standard is -3 outside) and the pipes sized
adequately to cover that.
The rub here comes in that there's a fair chance that if the radiator
already there is in a living room or dining room then it may already
be at or close to 1500W. Adding another heat emitter to the same
pipework would then result in both devices giving out heat at a level
that is too little.
You can check this by measuring the radiator in the other room and
then trying to identify the manufacturer and model - or something
pretty close. Watch out for whether it has one or two panels and
fins on either, neither or both. This affects the output a lot. The
manufacturer's data sheets have tables of outputs for each radiator
size. On a standard UK boiler, the water temperature is lower (82
degrees) than that used when testing radiators; so take the figure
from the table and multiply by 0.89 to get the actual typical heat
output. Make a note of that.
Now do the same for the existing kitchen radiator. Assuming that
the room is currently heated adequately, this will indicate the heat
that you will require from the fan heater. Generally these plinth
heaters are 1500 to 2000W but if the real requirement is less, they
can be run at lower fan speed or the water flow can be reduced.
If the sum of the heat requirement of the 2 radiators is less than
1500W, then you could go ahead and connect the fan heater as
described. If it's much over (e.g. more than 1800 to 2000W total)
then you will need to run separate pipes.
Is there a convenient way that you could extend and hide the existing
pipes? 8mm copper is very easy to work with.......
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