I know nothing about central heating so please don't flame me.
We have a small annexe over our garage which is not being used at the moment. I want to set the heating system up so that it uses the least amount of energy while protecting the pipes from freezing, is that necessary?
The system comprises a 'Worcester 240' boiler which heats the hot water and feeds 3 radiators. All of the radiators have thermostatic controls fitted but I am not sure what to set them to, to avoid frozen pipes.
I have some questions I was hoping you could help me with:
1. I was going to set the thermostats on all three radiators to the 'blue snowflake' setting which is the setting below a single red line, Is this right? My only concern is that when I set it to the blue snowflake (on all three radiators) it seems to cut off all the water (perhaps some is still flowing but I can't tell). If I turn the thermostat up to the mid point halfway between the blue snowflake and the single red line, I can hear water start to flow and the radiator gets quite hot but that seems to be too hot. Any advice?
2. I was going to set the boiler thermostat to the minimum setting. Is this right? This article https://www.energyefficiency.powergen.co.uk/advicecentre/category2/BoilerThermostat.htm on the Powergen website suggests that the boiler works most efficiently when set to high but I only want to heat a little water to stop the pipes freezing so I'm not sure what to do for the best.
3. Do I need to turn the hot water setting on to protect the pipes?
4. If I can figure out how to program the boiler, is there a recommended time when you should switch the boiler on over night to stop pipes freezing? Say 10PM - 8AM or something like that.
5. If I can't figure out how to program the boiler is it OK/economic to leave the boiler switched to the ON position for the next few months?
Hope I made some sense.
Thanks for any help.