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

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.

Huh! These are Grundfoss and far from cheap.

Sounds like they are not fitted right.

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.

OK. At some future stage we may want to let the main farmhouse so I am
anxious to keep the heating system understandable.

What is not understandable about a heat bank?