Recent content by moggie2002

  1. M

    condensing boiler - higher return temp == higher efficiency?

    Done, but I only achieved a few degrees drop on a rad. I need to check the pump again, but I think it has a variable speed grundfos rather than one with the 3 speed knob. There's always the option of lowering the flow temp a bit as someone else suggested. The bigger issue and likely biggest...
  2. M

    condensing boiler - higher return temp == higher efficiency?

    I've not seen the innards of such a boiler dissected to formulate more informed thoughts, but I imagined the possibility of a boiler that drew cold air into itself, not into the surrounding building of course, and directed it to the part of the system that needed to be cooled to trigger the...
  3. M

    condensing boiler - higher return temp == higher efficiency?

    Absolutely :) They are used slightly for feedback with the intention to use them more. There are actually several networks. The 1-wire system snakes around the house over a fair distance and has 11 sensors at the moment covering the UFH, some rooms and the boiler. I'd planned to put sensors...
  4. M

    condensing boiler - higher return temp == higher efficiency?

    Thanks for the further replies. I'm aware of how to balance the system, and had to do this originally when a couple of rads didn't heat up. However there's little drop across the radiators, and I assumed, incorrectly it would seem in this case, that less of a drop was better. The lock shields...
  5. M

    Digistat +3 wrong temp ?

    Not sure if the one you have does this, and while it might just be hard coded, it may have learnt that the room temp overshoots and be compensating; i.e. it might have started by switching off at the exact point, noted that the temperature kept rising by a certain amount, and be using an...
  6. M

    condensing boiler - higher return temp == higher efficiency?

    Due to the nature of the job we have our trades on day rates. The current plumber was recommended after we decided not to continue with the first plumbers and he seems to know his stuff. He's contracted to some big companies in the area and probably wouldn't be if he was totally rubbish, but...
  7. M

    condensing boiler - higher return temp == higher efficiency?

    As mentioned before, the boiler is actually one of the new Ideal logic+ ones that are an unknown reliability wise at the moment, but we decided to be early adopters. Like the rest of the house, the boiler is computer controlled, and in this case is part of a DMX network that controls the...
  8. M

    condensing boiler - higher return temp == higher efficiency?

    Thanks for the reply, and LOL. Actually it's better than the post might suggest, but I don't like to boast - "clearly" you might say, so I'll save you the trouble :) Actually we near enough are for part of the run that goes below ground in a cellar with open vents to the outside and winds...
  9. M

    condensing boiler - higher return temp == higher efficiency?

    Sorry for adding to the many condensing boiler posts, but I'm a little puzzled by the logic behind the efficiency arguments. I've read about the advised flow return temps for condensing mode, over sizing rads that some people do, temperature differentials on flow return, but don't these...
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