I have a Honeywell CM907 programmable thermostat, which cycles the boiler to maintain a steady room temperature. I've recently had the gas boiler replaced with a Vaillant ecoTec 831 plus, which has an anti-cycling mode. I think this is designed to allow the water in the radiators to cool down further between cycles, and so improve efficiency.
It appears to be a trade off between boiler efficiency and maintaining a steady room temperature. Is there more to it?
Honeywell suggest that anti-cycling does not improve boiler efficiency:
http://content.honeywell.com/uk/homes/files/pag101.pdf
I can adjust the anti-cycling period on the boiler, and also set limits on the thermostat cycling so that the boiler will always switch on when the thermostat calls for heat.
Does anyone have information on how these devices should best be configured to work together?
The boiler anti-cycling default is 20 minutes, while the thermostat defaults to 1 minute 'minimum off time' and a maximum of 6 cycles per hour for a gas boiler.
It appears to be a trade off between boiler efficiency and maintaining a steady room temperature. Is there more to it?
Honeywell suggest that anti-cycling does not improve boiler efficiency:
http://content.honeywell.com/uk/homes/files/pag101.pdf
I can adjust the anti-cycling period on the boiler, and also set limits on the thermostat cycling so that the boiler will always switch on when the thermostat calls for heat.
Does anyone have information on how these devices should best be configured to work together?
The boiler anti-cycling default is 20 minutes, while the thermostat defaults to 1 minute 'minimum off time' and a maximum of 6 cycles per hour for a gas boiler.