Going crazy can not reduce returns tempreature help help

Is it possible the towel warmers, being poor radiators and installed with larger bore pipework, are short circuiting the system and allowing the hot flow water a quick easy path to the boiler return.
I would check whether turning them off for a while makes any difference to the differential across the boiler.
 
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Yes but it means that none what I did had any effect whatsoever, and also it will take longe for the house to heat as I reduced the temp so is it worth it
With a given rad area the flow temperature must be high enough to give the desired room temperature in the coldest weather. If the rads are undersized the temperature could be too high to allow condensation. You could adjust the flow temperature depending on the weather, or install weather compensation, which does it for you.
 
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What's the exact model of boiler....look underneath. Post the full model no. and GC. No.
There's a variety of pumps fitted and some of the D settings may not apply.

Chuck your infra red thermometer in the bin...they are utterly useless unless they have an adjustable emissivity setting (and correctly set for each radiator pipe).
 
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Is it possible the towel warmers, being poor radiators and installed with larger bore pipework, are short circuiting the system and allowing the hot flow water a quick easy path to the boiler return.
I would check whether turning them off for a while makes any difference to the differential across the boiler.
Will try that thanks
 
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I was wondering about the accuracy of this hand held thermo, I will be looking to get the prob ones.

I tried to upload a photo but unfortunately the website prevented me.
ecotec pro 28 VUW GB 286/5-3 R1
Murphy's law the paper is torn at the GC no but the last 2 digits are 45 (I know not of great help)
Serial number 21124900100116901300287164N8

Was reading a little bit and it seems that it was manufactured in 2012 so not 10 years old yet
 
Chuck your infra red thermometer in the bin...they are utterly useless unless they have an adjustable emissivity setting (and correctly set for each radiator pipe).

The default emissivity will almost certainly be 0.95 so all you need to do is apply black PVC tape to whatever is being measured to get consistent and accurate results.
 
The default emissivity will almost certainly be 0.95 so all you need to do is apply black PVC tape to whatever is being measured to get consistent and accurate results.

Great in theory but it just doesn't work...there's no consistency between the readings. Matt black tape, glossy tape, new copper pipes, painted pipes....all makes a difference.
I've been there, used K type thermocouples to give the true temperature and concluded that cheap infra red thermometers are junk whatever you try.
 
You must've been doing something wrong. Black tape on the surface being measured *will* provide consistency and accuracy.
 
Unfortunately my calibrated £600 FGA with thermocouples has to disagree :)
Most of us use our hands...there's far too little time to faff about measuring temperatures to a degree accuracy when a 20+Kw boiler is flat out heating your average house.
 
Unfortunately my calibrated £600 FGA with thermocouples has to disagree :)
Most of us use our hands...there's far too little time to faff about measuring temperatures to a degree accuracy when a 20+Kw boiler is flat out heating your average house.
A 20kW boiler should never be flat out in an average house. 10kW is sufficient for the majority of properties ;)
 
As you are well aware many boilers can't be range rated on HTG and are sized for the DHW requirements... :rolleyes::rolleyes:
 
I was wondering about the accuracy of this hand held thermo, I will be looking to get the prob ones.

I tried to upload a photo but unfortunately the website prevented me.
ecotec pro 28 VUW GB 286/5-3 R1
Murphy's law the paper is torn at the GC no but the last 2 digits are 45 (I know not of great help)
Serial number 21124900100116901300287164N8

Was reading a little bit and it seems that it was manufactured in 2012 so not 10 years old yet

Oversized boiler, possibly. Has it been range rated?

Check the ABV to ensure it is not always bypassing (may need replacing).
 
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How is the pump being adjusted...they are single speed and there is no reference on the D parameters.
It sounds like the water is running straight through the internal bypass due to the high head of a microbore piped system.
When you've only minimal temperature drop looking at the D codes what's the actual drop across the radiators?
 
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Oversized boiler, possibly. Has it been range rated?

Check the ABV to ensure it is not always bypassing (may need replacing).
Any ideas how to check is it just simple taking temp of pipes when boiler is running
 
How is the pump being adjusted...they are single speed and there is no reference on the D parameters.
It sounds like the water is running straight through the internal bypass due to the high head of a microbore piped system.
When you've only minimal temperature drop looking at the D codes what's the actual drop across the radiators?
Reading through the forum previously posts sujested that d19 is the pump speed and that is how I adjusted
The actual drops through radiators is about 15 degrees but that is not reflected on d40 and d41 mesures as it is only 5 degrees
 

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