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Thermal storage water
heaters |
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| This section is sponsored
by Richard Hanson-Graville, Technical director at DPS Heatbanks,
a leading manufacturer and supplier of water heating systems,
visit there comprehensive website at www.heatweb.com
for detailed information design and made to measure water heating
systems. |
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A thermal storage water cylinder
reverses the indirect water-heating principal. Water that passes
through the central heating system and boiler also passes through
the cylinder.
The water that is in the cylinder never changes it simply
flows around the vented or un vented heating circuits being
re heated by the boiler. The build up of scale within the
cylinder is therefore eliminated and extra system protection
is achieved by the addition of corrosion / scale inhibitors.
If required, anti-freeze may also be added. (See below) |
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The hot water is stored in the cylinder and can
be heated to a maximum of 90°C thereby increasing the amount
of heat energy available for use, while the use of CFC Free
Foam Insulation retains the heat within the stored water.
Heat is transferred by a highly efficient heat exchanger.
Cold mains water enters the heat exchanger when a tap is turned
on, the water goes round the exchanger gaining heat from the
stored hot water in the cylinder, it is then delivered to
the taps. |
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When the system is working correctly and at full
capacity the mains fed water is delivered at such high temperatures
that cold water needs to be added first to protect from scalding.
Therefore a thermostatic mixing valve is usually plumbed into
the outlet supplying the taps and showers.
The mains hot water is not stored and is therefore drinkable,
and removes the need for a cold-water storage tank. There
is no chance of the introduction of Legionnaires' Bacteria
into the domestic supply.
The stored water within the cylinder can be heated by various
methods, including Gas/Oil Boilers, either directly or indirectly
(using a coil), or by Electrical Immersion Heaters utilizing
various tariffs. |
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A good innovative example of a thermal
store unit is the Stowaway by DPS Heatbanks. The design of the
stowaway has enabled the removal of the overflow warning pipe,
leaving only two connections - a cold in and a hot out.
By not having to fit an overflow from the hot water system
removes the need to run pipework outside the property. In
turn units can be sited anywhere within the dwelling you can
get a mains water supply to. |
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 More
information on the 'DPS thermal store Stowaway' |
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| Find
out how a Thermal Store works |
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