"Ed Sirett" wrote in message
news
On Wed, 03 Nov 2004 10:42:10 +0000, IMM wrote:


"Pandora" wrote in message
...
Does anybody know of a good quality hot water cylinder which has a
facility
to replace the cylinder thermostat with a temperature sensor for better
control?

The hot water system will be unvented and I'll be using a condensing
boiler.

Use a quick recovery cylinder with a condensing boiler. Also use two
cylinder stats to prevent boiler cycling. One top one bottom. The
stats
can be strap on. High accuracy stats are not required for a cylinder.
Only
when the cylinder drops many degrees, differnce set by the two stats,
will
the boiler kick in and re-heat with one long efficient burn.

Albion, Range do suitable cylidners. Travis Perkins do the Telford
Typhoon
which is well priced.

Some of the control systems that are now being used in some boilers are a
significant (even you might say a quantum) leap ahead than simple on/offs.
Some of them are sophisticated enough to work out a good enough strategy
simply from the on/off signal and the return flow return temperatures.

They do and that is designed for the heating function. DHW usually throws
them, unless they know it is DHW by a signal from a stat.