Notwithstanding having a new boiler (W-B 30CDi system boiler) fitted a couple of months ago, the house is not warm enough and am trying to understand why. I've just been round the house taking temperatures using the i/r thermometer I bought with a view to balancing the radiators.
First issue is that the roomstat in the hall is set to 20 deg, yet is displaying 17 deg (which is approx the actual temp in the hall), and is calling for heat continually as far as I can see (the boiler seems to have firing pretty much all day).
I've turned up all the TRVs to maximum today (lockshield valves are set wherever they have been since installation) and measured flow and return temps at each radiator and the boiler. With the HW off, boiler flow and return temps are 63 and 53 Celsius; on the radiators the ranges are
51-63 deg (flow) and 47-57 (return). The temp difference across the rads ranges from 2.5 to 9.5 deg; most of them are at around 5 deg, which is much too little, right? (should be about 11 deg?)I'm puzzled as evidently the overall drop accross the boiler flow and return is about right, but why is it much too small on *all* the rads? Where's that heat going?! And how can any fine-tuning of the lockshield valves sort it out? And/or is the new boiler undersized?
If anyone can suggest what I should be doing to get the house heating properly I'd be very grateful...
Thanks David