Operating Of A Modulating Boiler Compared With That Of An "On/Off" Boiler - REMEHA Celcia 20 Démarrage Rapide

1.3 Operating of a modulating boiler compared with that of
an "on/off" boiler
On/off boiler
Modulating boiler
• The graph shows how a modulating boiler works. The boiler burns for longer on a
lower heat output. This enables temperatures to remain more uniform.
A non-modulating boiler (on/off) simply burns at full heat output and then switches
off again. This means that the temperature fluctuates more.
• A modulating boiler also ensures that the radiators do not get too hot — even
when the temperature on the thermostat is increased. The radiators remain at a
more constant temperature, which can be gradually increased or decreased.
• After increasing the temperature on the modulating thermostat, the boiler will not
fire up immediately as with an on/off thermostat. This takes around a minute.
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Remeha Celcia 20
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