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GB
Gas are qualified to install, repair and service unvented how
water cylinders and installations. We hold a Construction skills
Building Engineering UHWSS LEVEL3 CERTIFICATE to comply with G3
of the building regulations.
At
present, the Building Regulations only relate to hot water
storage systems that have over 15 litres capacity. Therefore
they do not apply to a system having a storage capacity of 15
litres or less.
(a) Any over 15 litre system installed by a competent installer
should be installed and used to satisfy the Building Regulations
(Document G3).
(b) The installation of an over 15 litre system covered by the
above document should be carried out by a "competent person".
Section G3 goes on to state that anyone holding a current
Registered Operative Identity Card issued by one of the five
organisations or category of organisations holding registers
meets the definition of a "competent person".
Unvented hot water cylinders provide hot water at mains
pressure. Unvented systems offer many advantages to the
traditional vented copper hot water storage system.
Traditional systems use a cold water cistern that draws water
from the mains and feeds it to a hot water cylinder. The taps in
the house draw hot water from the cylinder as needed. The water
pressure and flow rate of the hot water is dependent on how much
higher the cold water storage tank is above the outlets. In most
houses, this means placing the cold water storage tank in the
roof space. Even then, the water pressure isn't always as strong
as desired.
Unvented hot water cylinders draw their water directly from the
water mains. This means that water can be delivered through the
pipes at a much higher pressure resulting in higher flow rates
at the taps without concern about where the hot water cylinder
is placed. Installing an unvented hot water cylinder for your
domestic hot water use means:
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Less pipes throughout your house and no storage cistern
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No storage tank in the roof space leading to less chance of
frost damage
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Lower installation costs because of the compactness and
fewer components of the water heating system
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More flexibility in determining where to place your hot
water cylinder
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A wider range of choice in taps and shower fittings
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High efficiency rating and lowered heating costs
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High pressure showers
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