On Sat, 4 Sep 2004 09:39:31 +0100, "IMM" wrote:


"Andy Hall" wrote in message


You simply connect the modulating boiler via either a diverter valve
or two (or more) zone valves with one way going to heat the heatbank
and the other to the radiators. The boiler will handle both in
the most efficient way. It is pointless to make it any more
complicated than that.

The boiler will not have load compensation modulation control, so he is on
the right track.

Not if it is a simple external box with on/off control of the boiler.
If it is working, the best it can do is to cycle the boiler on and off
during heat demand periods of the room thermostat to reduce or
increase the average heat output. This is intended to compensate
in some way the thermal behaviour of the space being heated.

With a modulating, condensing boiler, there is absolutely no point in
doing this with this type of device because it simply cycles the
boiler when that doesn't need to happen.

If the boiler has the ability to have an external temperature sensor
connected which does give its controller an analogue reading of the
outside temperature, then that is worth having. However, this type of
boiler costs more, even though the sensor is cheap or even included.


..andy

To email, substitute .nospam with .gl