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Posted by ROGER TAYLOR on November 01, 2009 at 07:22:41:
I originaly had a Potterton Netaheat boiler controlled by a seperate thermostat and timer. I think I am right in saying that the thermostat worked on a bi-metalic strip principle. During the "timer on" period the thermostat would cycle on & off and the radiators would to some degree be warm all of the "timer on" period.
I have had a Ferroli HE 38C boiler and Salus Programmable Thermostat installed and during the timer "on period" the thermostat switches the boiler on but after it reaches the set point temperature it switches the boiler off and during the evening "on period" does not switch the boiler back on for typically 4 hours during which time the radiators go stone cold and we "feel cold" something we did not experience with our old boiler installation. I have to say that during this time the digital temperature on the programmable thermostat often reads 20.5 degrees the set point being 21 degrees.
Am I right in thinking that this situation arises from the fact that the digital programmer is more sensitive to the ambient temperature and is something we have to live with or is there another solution?