He might be on here to boost ratings, like Wolf on Gladiators or Simon Cowell. Except they both know how an Alpha CD50 works. Although have to concede Drivel probably knows more about music than Cowell.
Your main heat exchanger may be leaking where it transfers heat to the secondary side (HW). To test watch if the boiler pressure gauge rises late at night (when mains pressure is higher). The 24i RSF has a single bi-thermic heat exhanger which will be more costly than a separate secondary plate...
Billy Bob, you should have noticed by now the UK only becomes relevant/irrelevant according to how well or not their (Balenza, DD, WS, RH-G) argument is going.
Not like the Alpha CD50, which of course carries all the burdens of an unvented. Certainly not what DD would usually recommend...... Unless he thought it had a thermal store.
The materials for a traditional fully pumped system are still competitively priced. The downside is the labour cost. However a true professional would still put this together with relative speed.
Not bad though Giblets, think about usual X metres 316 stainless smooth bore liner (for wood fuel), closure plate, sealing plate, flaunching, vermiculite etc... then the labour and it's not even permanent.
Water Systems, R Graville-Silly-B*****ks, Balenza or is it Drivel again under yet another name (could be his boyfriend, maybe he pulled at Ecobuild). You posted about outdoor combis being your invention not me. Can't compete on the Pandorro being as you work for DPS, Heatweb or whatever stone...
So for your latest face saving attempt, you've added theftproof and high flow to your criteria.
Can't answer for theftproof.
Now Italian external combis and lowish flow rates? I presume you say lowish, not plain low, to cover your sorry a***.
The Meteo Green is made up to 35kW to DHW...
Your RGI should have calculated the pipe run. As you've been informed of the result, no-one on here has reason to doubt them.
Using an undersized gas pipe is illegal and dangerous, hence the firm reply at your vain attempt to get round it on this forum. If by getting others in you hope to...
You've just had someone round, so either it's not been explained properly or you've totally misconstrued what might have been told to you.
Most OP's post repeatedly on this subject driven purely by a desire to cut corners after being told something they don't want to hear.