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Combination
tanks are often used where space is at a premium or for ease of installation,
reducing the need for a separate cold water cistern.
Where
indirect systems are concerned, however, there is usually still a need for a
header tank to feed and vent the primary circuit. This need can be fulfilled by
incorporating the header tank with the cold cistern of the combination tank.
This is achieved either by inserting a separate smaller tank in the main cold
tank (known colloquially as a 'D' tank combination) or splitting the main tank
in half (known colloquially as a split tank) In both cases both cold feed tanks
have their own cold supply controlled by a ball cock valve.
Alternative
energy technology is moving apace now and more and more people are taking
advantages in particular of advances in solar energy engineering. Improved solar
panel design has led to greater efficiency and cost effectiveness.
Solar
cylinders incorporating a high efficiency heat exchange coil, often manufactured
in finned tube, provide the means to store the heat energy gained by the solar
panels. This solar heat energy can substantially reduce the demands on
traditional heat energy sources (e.g. central heating boilers) to provide hot
water and room heating.