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scoobydo123...you were after some data. Only setting I changed was D0 to 22. D2 is still preset value of 20. Typical flow temps for D41/D40 as follows (haven't timed...) HW / CH 52/37 Delta 15 65/50 Delta 15 68/52 Delta 16 71/62 Delta 19 HW only 66/49 Delta 17 74/54 Delta...

scoobydo123 I kept the same cylinder thermostat

gypsy182...I was about to give an update so you've prompted me. I've just replaced an old 120 litre cylinder with a 140 litre version that has high recovery. (Range Ultracal). I've gone slightly over the top on that as the family is growing and needs more water etc. I reckoned the heating...

FWIW...I don't know ALEC1 and have had little contact with installer. They have done their best to resolve but are clearly out of their depth. I really appreciate the recent messages that confirms my suspicion that the pump isn't right. (although the installer relaced it..). In meantime...

I forgot to mention typical D40/D41 values. Ramping up when D0 = 17 this morning...though its behaved itself much better than previously! 10 mins = 55/30 (dT =25) 20 mins = 67/38 (dT = 29) 25 mins = 70/41 (dT = 29) S53 for 15 mins and restarts automatically 40 mins = 68/46 (dT = 22)...

As its been a few months since I posted I thought I'd give an update as well asking a question. A reminder that I have a replacement boiler: • Ecotech 428 • Open Vent condensing boiler • Fully pumped system (2 motorised valves) • DAB VA55-130: 3 speed pump on setting 2 • Power flushed...

UpgradeMe...I really appreciated your post and was gobsmacked by all the work you've done to optimise your boiler. Impressive. It's very clear from the expertise on this board, that the experience is in the people who install/use the boilers. I got very little out of Vaillant themselves. I...

Agile has asked details of the cylinder. There are no markings whatsoever on it. Its factory lined foam with a dirty yellow/ green colour. Thickness of foam is about 1/2". Size is 900mm tall by 450mm diameter. Looks as though comes out about 120 litres. Agile has also asked details of the...

Wow...fantastic advice. Here's an update and reply to comments. Agile asks re. load. My first pass calc this morning is about 22kW but there's a more accurate method that I shall check tonight. (I have a 4 bed house plus conservatory). Hence you are spot on re. oversizing. The system is...

Many thanks to all. Terrific advice and I wish I'd posted earlier!. I have derated the boiler as suggested and that seems to have solved the S23 issue. (issue no.4). Rerouting the feed/vent of the expansion tank will no doubt solve issues 2,3. Only remaining issue is no.1 which is the...

Appreciate comments so far. More info as follows: It replaced a Potterton Netaheat 16-22 so increase in size didn't seem too great. I have 14 radiators and size chosen was similar for 3 quotes I got. I had system powerflushed beforehand. Took a day for them to do all radiators. Wish I'd...

I'm pulling my hair out on some issues with my newly installed Vaillant system. The installer has been responsive but I think the issues are beyond them so seek the input of specialists on this forum. Details: • Ecotech 428 • Open Vent condensing boiler • Fully pumped system (2...