Heatslave 20/25 surge

[SJB060685]

Yes it will prevent 1200 litres from reaching the fire, if the flexi goes you'll still loose some to aid the fire though. I recommend you have it all serviced by a reputable guy/company anyway.

 

[richard3009]

Just one more thing I have never really understood is how do you decide what temperature to set the radiator water to on the heating control knob, what is most efficient high temp at rads, or warm enough to do the job, if they run up too high fast do you end up cycling the boiler, currently its in mid position but there are no figures for temp.

 

[SJB060685]

If it's a standard efficiency boiler then you need to ensure the return temperature is higher than 55 degrees to prevent corrosion in boiler. If not the then back end protection is required, usually by a mixing valve to ensure desired temperatures are matched. If the return temperature is too low then burner gasses can condense inside chamber causing corrosion on boiler