Hello again, C.H. pundits. Our house has only three radiators (that's how we chose to heat it, mixing gas "fires", electric convection heaters and radiators, and we are quite satisfied with this). The combi boiler currently installed is a Vaillant EcoTEC Plus 824, and I am on the point of changing this for a new Vaillant EcoTEC Plus 826 26kW (the nearest in output and quality, to what is already installed). When the 824 was installed, the engineer said that, in view of the low output it needed because of the few radiators, he had reduced its output accordingly. I understand that this is called "modulation".
My questions, then, are: 1) is the boiler that I am thinking of having installed a modulating boiler also? (I need to know for sure, because the man that is coming round to give me a price does not seem to know. I was not satisfied with the way he seemed to duck my question).
2) If it is a modulating boiler, will it be in keeping with best practice if I also had a modulating timer/thermostat installed? At present, the timer/thermostat is a Honeywell CM 907. I think that this is just an ordinary timer. Would it make a big positive difference to change it for a "modulating" thermostat/timer?
3) Even if the Vaillant 826 were not a modulating boiler, would a modulating timer/thermostat be enough to keep the output stepped down, regardless?
With thanks in advance, for any helpful and informed replies,
L.L.
My questions, then, are: 1) is the boiler that I am thinking of having installed a modulating boiler also? (I need to know for sure, because the man that is coming round to give me a price does not seem to know. I was not satisfied with the way he seemed to duck my question).
2) If it is a modulating boiler, will it be in keeping with best practice if I also had a modulating timer/thermostat installed? At present, the timer/thermostat is a Honeywell CM 907. I think that this is just an ordinary timer. Would it make a big positive difference to change it for a "modulating" thermostat/timer?
3) Even if the Vaillant 826 were not a modulating boiler, would a modulating timer/thermostat be enough to keep the output stepped down, regardless?
With thanks in advance, for any helpful and informed replies,
L.L.