On Mon, 17 Nov 2003 13:33:09 -0000, "simon beer"
wrote:


"IMM" wrote in message

If you do decide to stick with a vented HW system, and it certainly
does have a number of advantages,

What are they, in brief?

Consider a heat bank. Mains water pressure at the taps, so high pressures
showers and no pump, but no high pressure cylinders. Can be DIYed.
For an explanatioin:
http://www.heatweb.com

then it is worth changing the
cylinder for a fast recovery type to improve HW reheat performance
while you are at it.


Can fast recovery cylinder only be fitted with a heat bank, not read about
them yet. Or do they work just in cojuntion with the boiler. Any links,
names or idea of prices on the fast recovery cylinder




Apart from the installation aspects of a heatbank (not needing a
professional installer vs. a pressurised cylinder), the cylinder water
is effectively storing energy for use through a heat exchanger which
heats the water on demand. A stainless steel plate heat exchanger
is typically used and can transfer large amounts of energy (100-200kW
is not uncommon). In that sense, it does not suffer from the
limitations of a combi which will be limited by its size and rate of
gas use.

However, before considering any kind of direct mains hot water system,
it is important to validate that the flow rate from the main is
adequate. 30 litres per minute at the rising main/kitchen cold tap
is reasonable.



..andy

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