About a year ago I had a new central heating and DHW system installed. Greenstar 24i System boiler with a pressurised hot and cold water system and UFH to the ground floor. The controls are a Heatmiser system and a thermostat on the hot water tank.
I was told by the plumber that the heating & DHW controls on the boiler (1 to 6) should be set to max 6 as the hot water is controlled by the tank thermostat and the UFH temp by the heatmiser system. I took his advice, but painting outside the other day I found that the vapour coming out of the boiler flue was very hot, so I tried turning down both hot water and heating controls on the boiler to the min setting of 1 - the boiler flue gases now appear a lot cooler, the hot water temp is fine but the boiler seems to be running for longer when the hot water is scheduled to be on. Unfortunately it is too warm to test the UFH (super insulated house!)
Clearly there is a trade off here, but what are the best settings for this type of system?
I was told by the plumber that the heating & DHW controls on the boiler (1 to 6) should be set to max 6 as the hot water is controlled by the tank thermostat and the UFH temp by the heatmiser system. I took his advice, but painting outside the other day I found that the vapour coming out of the boiler flue was very hot, so I tried turning down both hot water and heating controls on the boiler to the min setting of 1 - the boiler flue gases now appear a lot cooler, the hot water temp is fine but the boiler seems to be running for longer when the hot water is scheduled to be on. Unfortunately it is too warm to test the UFH (super insulated house!)
Clearly there is a trade off here, but what are the best settings for this type of system?