On Fri, 3 Sep 2004 00:12:43 +0100, "IMM" wrote:


"Andy Hall" wrote in message
.. .
On Wed, 1 Sep 2004 13:54:06 +0100, "IMM" wrote:



Also making the primary pressurised with a direct heatbank (i.e. the
bulk contents of the cylinder are pressurised) means that for Building
Regulations section G purposes it counts as a sealed storage system
and must therefore be installed by a certified installer.

Not according to RCM:
"Thermaflow is a primary water thermal storage unit that supplies mains
pressure domestic hot water at good flow rates in accordance with the
requirements of BS 6700.
NHBC and the Water Heater Manufacturers Association Specification.
The thermaflow system facilities easy installation without the requirements
for building control or BBA approval and is readily incorporated into
traditional or modern central heating systems. NO MORE NEED FOR COLD WATER
STORAGE TANK IN YOUR ATTIC."
http://www.rcmgroup.co.uk/files/ThermaflowINST.pdf

This is a "pressurised" thermal store to assist combi's and give higher
flowrates.


Well..... your friend Rocky seems to disagree.

From Part G3 of the Approved Documents to the Building Regulations, an
Unvented Hot Water Storage System means an unvented vessel for either

a) storing domestic hot water for subsequent use, or

b) heating domestic water that passes through an integral pipe or coil


The Thermaflow seems to definitely be b)


..andy

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