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Thanks again for the reply its very helpful and apologies if my past replies were not clear. So if i havent been clear enough :) -> the heat requirements for the house are 12.16570984 Kw. - This is what's needed at T50 So as an example, my office needs 2994BTU at T50, and the radiator outputs...

Please remember i'm not a heating engineer so not all of this makes total sense at the moment so 158sqm * the energy loss (134.14watt) based on chat gpt which isnt 100% acurate but will be aroundabout, /100 is what you said above Confusion here is this; my calcs to get the heating requirement...

DT30 KW requirements: 12.1657kw

Ah i see Well i based the heat demand on BTU. I sized the rads at T30 based on the BTU needed for each room, which converted to kw.. see table below :) Name KW dt50 KW dt30 dt50 BTU output dt30 BTU output Required BTU Total BTU FLOMASTA TYPE 22 DOUBLE-PANEL DOUBLE CONVECTOR RADIATOR 600 X...

I think 50 degrees on the boiler should be more than adequate, it's set to 50 at the moment and within an hour the house is WARM Also means as temps drop it has a bit more umph, 45 might be a bit on the low end. It can get to a stale 7 degrees ish here in the UK in the house if* we dont use...

nope, afaik no WC, although that would be great. The setting (6) is Min. outside temperature of the heat curve which is -7, suspect that this is then related to WC Yep, i added 10% BTU to them as well for wiggleroom at T50.. actual heat demand at -5, not sure ho to calculate this I used chat...

We can get lower than -5 but i think generally where I live anyway (Midlands) it gets on cold months about -3. I think the default curve on the boiler is also set to -7 but would need to read up on that Yep, they're rather large.. Mostly T22 and5/6 T21. Appears i can get them down to T20...

Thanks very much i think this makes sense to me now The boiler should do 24kw, so 17.2LPM and that should mean that i can run down to 44 on the flow temp, return of 38 - 17.15LPM.. but i think from a "beat the crap out of the pump" perspective, it would be better at 45 degrees with T20 and flow...

Name KW dt50 KW dt30 FLOMASTA TYPE 22 DOUBLE-PANEL DOUBLE CONVECTOR RADIATOR 600 X 600MM WHITE 1.025207 0.52778 FLOMASTA TYPE 22 DOUBLE-PANEL DOUBLE CONVECTOR RADIATOR 600 X 1200MM WHITE 2.050414 1.05555 FLOMASTA TYPE 22 DOUBLE-PANEL DOUBLE CONVECTOR RADIATOR 600 X 1200MM WHITE 2.050414...

Sorry also assuming that Deg Rad is the radiator temperature

So this is an accurate reflection of the current setup, i'm trying to get that extra 4 degrees out of the DT One thing not on the sheet that i need to know is the pump speed for the CH (c) and Modulating Pump (c.) I guess i can add an extra couple of columns in and play with the formulas...

Legend i will have a play!

Ah ok this is great to know thank you :) - yes i sized them based on T50 rads I have well insulated the house, we have a new extension on the back and the rest i have battened out the walls and applied 50mm phenolic board so it gets nice an toasty. The settings i have on the boiler at the...

Great reply thank you! Apologies about my beginner level understanding, i am learning still :) I see.. then i may have oversized the radiators a bit too much? I calculated the radiator size by finding the BTU needed for the room based on the BTU output of the rads at Delta T50°C. So...

Thanks to all for your replies it is appreciated Mine are mildly warm at the top and almost stone cold at the bottom, but after about 20 minutes they get mildly warm at the bottom and warm at the top, never hot all over Sorry not sure, i dont think so.. The boiler has 2 options on c and c. -...

Well at some point last night i played about with the CH pump and modulating pump and all the radiators got warm, even at the bottom. id set the boiler temp to 55 degrees and had a return of 34 degrees However i turned the pump up high to push water trough the system and now the radiators are...

Hi All Firstly a bit of background. We have an Intergas 28/24 boiler, factory settings bar the min rpm set to 25 not 30. We have just had an extension and we have added in new radiators across the house. We have gone from a 3 bed 1 bathroom to 4/5 bed (if you include the garage now an office)...