Recent content by Waldovr

Afraid the service person didn't... Thanks again now I will definitely get a vaillant service engineer to investigate. Dirt on seating sounds like a possibility, it's only 4 year old boiler but obviously there's every chance the installer just threw it in without cleaning the system... Wasn't...

@Agile I am baffled as was hoping somebody could say 'if you have such a large difference from what the boiler reports obviously you have a '... fill in problem. An over active bypass would be one such problem, that would help. At least then I can get a good vaillant engineer to replace it...

Ok, good to have that clear. Glad I'm not the only one misunderstanding. And it does seem to match the 20 degrees max differential.

@D_Hailsham, Yes, forgive me my errors rounding up and down. When boiler is at minimum power from the display so there is some reading errors there, plus it reports in whole degrees rounded up or down. So I have unfortunately not found a free energy source ;-) Boiler measuring (d40 and d41) a...

@Agile yes, all the way down, clockwise. Says the same in the manual.

@Agile if I recall correctly this was trying to push more flow through the radiators, we had a discussion about house a bit slow warming up during his maintenance visit. I asked about powerflush and if that would help but he said the system didn't seem sludged up and was coping well with the...

Don't worry, the Gas Certified service repair man adjusted the ABV, on advice from the Vaillant helpdesk by telephone. Thanks for the input @Agile, it looks like opinion is divided, but I think you are correct, it shouldn't bypass and it's bad for performance. Problem is, how to find out what...

Sorry missed this one. Quite simple: I live in a 5 bed detached house with bedrooms kept around coolish and only 3 rooms at 21. But my annual usage is 37000 kW. Bit steep I think. It's double glazed, cavity insulated, loft insulation ok; house stays warm for hours once it's warm and heating is...

No, we're not. Strange question. But my original question seems to get lost in the branches of this thread. Basically: If flow over heat exchanger is over 1200 l/h, with a differential of around 5 degrees but flow through radiators is only around 700 l/h, with a differential of around 11...

@D_Hailsham: Pipe 22mm and quite long pipes; but boiler now range rated at 18 kW so that should be ok I guess. One more question to the person that put this oversized boiler there...! Boiler says VU GB 376/5-5 R1. Manual is 0020116700_02 GBIE 062012. Serial number indicates 2012 (xx12xxxxxx)...

Thanks for your reply @D_Hailsham; Same pump, are you sure? I've found documents for ecotecs and they have different pump graphs for different models, and my models' documentation lists different flows for different boiler versions. Latest versions seem to have a smarter pump that has a larger...

The boiler reports what it measures inside just before and after the heat exchanger - d40 and d41. I have bought a temp sensor thingy just for this with two contacts to click on the pipes and measure the temperatures just before and after the boiler. There's a big difference in return values as...

Well I have come across Low loss headers and as I understand it would decouple the boiler flow from the radiator flow... But I don't see how this would improve the situation, as the radiator flow will still be less than the boiler pumps around; basically it would mix colder return with some of...

Thanks @The831Bunny that confirms what I was thinking. A shame it would only just justify the expense. But there's a feel good factor for using less fossil fuel too obviously. And I've got the suspicion it might be more comfortable to have the radiators on gently all the time. Currently you...

@Steelmasons No not exactly - I know the boiler is well up to the task. Problem is that it's too big for what I need and I am seriously concerned this makes it run very inefficiently (from a cost perspective...) Even though it can run at lower power this is only the burner, never the pump and...