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An 'indirect' cylinder is
designed to be heated by a remote heat source. Typically these
days this would be a gas boiler. There are however other devices
that can produce the heat to do the job. It is important to
choose the correct type of cylinder to accept the heat source - pumped (as it would be
from a typical gas boiler) or unpumped (the sort of heat source
one might expect to get from a wood burning stove or an AGA or
Rayburn stove). The cylinder should also be vented.
Note:
Unvented cylinders (the type that provide mains pressure hot
water) should not be connected to a heat source that cannot be
fully controlled - the risk of explosion exists. Mains pressure
hot water can however be achieved in conjunction with a gravity
heat source by using a 'Thermal Storage Device' such as a
Torrent RE. For more
info on how click here.
An AGA (for example) will produce
an 'unpumped' circuit of hot water relying on the
principle of hot water rising (and cooler water falling) to
create 'gravity circulation' within the system. A cylinder that
will happily accept an unpumped heat source is subtly different
from a standard cylinder in so far as the heat exchanger has a
larger diameter bore and the tappings (the in and out
connections) are spaced slightly wider apart which improves the
thermal dynamics and therefore the flow.
Do not connect a cylinder designed
for a fully pumped system to an unpumped system. Please ensure
you mention the heat source/s you intend to connect when
ordering to ensure you get the right advice and the correct
product. |