"Tim Lamb" wrote in message
...
In message , Doctor Drivel
writes

"Tim Lamb" wrote in message
. ..
Does anyone have practical experience of fitting one.

I have been trepidating over ordering a log burner with CH boiler
basically because I suspect the coil on my existing hot tank is too low
for either version of the neutraliser to work under gravity alone.

Raising the tank is not very practical as it would then bulge into the
loft. A second hot tank could be installed but with what benefit?

As a sideways step I have ordered a log burner which can have a CH
boiler retro-fitted while I seek counsel:-)

regards
-- Tim Lamb

They are a total and utter waste of expensive time. Get a heat bank
/thermal store which does the same, a neutral point, but far more.

For explanation:
http://www.heatweb.com

An interesting site. A minor criticism is that the descriptive notes to
their explanatory diagrams do not display legibly in my version of
Explorer.

Update explorer or down Firefox for free.

Prevention of *boiling* is fundamental to any unattended solid fuel
appliance but this is the first time I have seen mains cold water, run to
waste, suggested as an overheat prevention measure.

The intial stage is run the DHW pump through the plate heat X as this takes
hot water from the top of the cylinder to the bottom.
Next stage can be running the CH.
Third, dumping mains water. (this is poorly mechanical so should work when
electrical outage)

An initial reaction is concern at the number of additional pumps! I find
my existing system, run all year on demand, needs a new pump every 6
years. Currently I am changing to the adaptive version in the hope of
quieter operation near control temperature and better pump life.

A good pump should last 10 years minium if fitted properly. Cheap pumps
dop't last.

These do bespoke stainless steel versions.
http://www.advanceappliances.co.uk/g...e_systems.html

I'll have a closer look when I have more time. An initial reaction is that
a simple neutraliser and associated controls is likely to be much cheaper
as a retro-fit. Where was your system when we were making decisions in
1994?

There were there. By fitting one now, or converting the existing cylinder
which is a cheap way, you instantly get a state-of-the-art system and bang
up to date. The benefits are immense. Do not underestimate the buffer
effect for CH, of a heat bank. A Dunsley is not cheap and does little. The
DHW was taken off via an immersed coil. Look at the Navitron web site and
forum. They have many there who use solar panels and solid fuel with heat
banks.
http://www.navitron.org.uk/forum/index.php
Type the words, heat bank, into the search and lots comes up.