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Notes on F&E Tanks
All thermal stores require
a Feed and Expansion tank (F&E) to facilitate thermal
expansion, evaporation and system top-up. Existing tanks
and other proprietary products may be suitable and
therefore used. However, your strict attention is drawn
to the suitability of any tank you plan to use in view
of the temperature of water that could potentially reach
it.
You should ensure the tank
you intend to use can handle water at the temperatures
associated with thermal stores, with special attention
being paid to this issue if an uncontrollable heat
source is connected (i.e. wood burning stove, AGA,
Rayburn etc).
Horrific injury or death
from scalding can result if an overflow scenario exists
with a tank that distorts or sags when subjected to high
temperature water.
Gledhill can supply two
types of F&E tank (40 litre*) as an optional extra for
use with the Torrent Greenheat thermal store. Both types
are plastic and utilise plastics technologies suitable
for their intended use.
Type 1 is suitable
for use on a standard system where the heat source is
regulated (e.g. gas or oil boiler controlled by
thermostat).
Type 2 is suited
for use with less controllable heat sources such as wood
burning stoves or an AGA where heat from the source is
unregulated.
*F&E tanks must be sized
to take the water expansion of the whole system into
account. (i.e. if additional system pipework connects
directly to the cylinder the volume of the whole must be
taken into account)
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