On Mon, 22 May 2006 13:50:31 +0100, Doctor Drivel wrote
(in article ews.net):




Buy a Danfoss BEM 5000, that will do they job for you. I saw one on ebay
that went for £22 brand new plus £5 postage. ~£200 worth of compensator for
buttons. Most don't understand them and can't see what they can get from
them, thinking a modulating boiler is the answer. Modulating on a setpoint
boiler temp is not the same load compensation compensation.




This type of thing is a very poor option in comparison with a proper weather
compensation on the boiler controller whereby it knows what the temperature
is. It might be worth £22, but certainly not £200.

Control of the boiler is on/off which is the weak part of the whole thing.
While it is able to take outside temperature into account and be reasonable
if one already has a simple switched boiler, it has to resort to timed
anticycle to prevent reduction in efficiency as a result of on/off firing.


The better option is undoubtedly an integrated weather compensator coupled
with room temperature sensing and boiler and pump output control.