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 Post subject: Temperature Assumptions?
PostPosted: Mon Feb 11, 2019 5:16 pm 
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Quick question about heat output from a radiator. I spotted on rated at 5569BTU. When manufacturers make their calculations, what temperature drop do the assume between feed and return water temperates, and what room temperature do they assume?

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PostPosted: Tue Feb 12, 2019 12:29 pm 
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Radiators should be tested to BS EN442, which specifies: Flow - 75C, Return - 65C, Room - 20C. This gives a Delta T of 50C

Some unscrupulous firms still quote the earlier standard which used a Delta T of 60C, thus giving "more" output.



For this message the author D Hailsham has received gratitude : AlwaysLearning
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PostPosted: Tue Feb 12, 2019 4:51 pm 
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Depends what boiler you have.

If a condensing model, then the temp difference between flow and return is 20c, if non-condensing then it is 11c.

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PostPosted: Tue Feb 12, 2019 7:58 pm 
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D Hailsham wrote:
Radiators should be tested to BS EN442, which specifies: Flow - 75C, Return - 65C, Room - 20C. This gives a Delta T of 50C


I wouldn't want to touch 70C for very long - that's well into contact burn injury territory

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PostPosted: Tue Feb 12, 2019 8:04 pm 
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gas4you wrote:
Depends what boiler you have.

If a condensing model, then the temp difference between flow and return is 20c, if non-condensing then it is 11c.

That got me hunting for my boiler spec - it has the flow/return differential as 12C for my, what I've always thought of as, condensing combi boiler. :dunno:

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PostPosted: Wed Feb 13, 2019 9:33 am 
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AlwaysLearning wrote:
That got me hunting for my boiler spec - it has the flow/return differential as 12C for my, what I've always thought of as, condensing combi boiler. :dunno:

Make and model of your boiler?


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PostPosted: Fri Feb 15, 2019 12:32 am 
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D Hailsham wrote:
AlwaysLearning wrote:
That got me hunting for my boiler spec - it has the flow/return differential as 12C for my, what I've always thought of as, condensing combi boiler. :dunno:

Make and model of your boiler?

Worcester Bosch 35CDi II

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PostPosted: Sat Feb 16, 2019 11:24 am 
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AlwaysLearning wrote:
Worcester Bosch 35CDi II

If the GC number is 47 311 58, then it's not a condensing boiler; it's just a modulating (variable output) combi boiler.

The GC number is on the front cover of the Installation Manual, or on the boiler's data plate.


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PostPosted: Sun Feb 17, 2019 12:39 am 
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D Hailsham wrote:
AlwaysLearning wrote:
Worcester Bosch 35CDi II

If the GC number is 47 311 58, then it's not a condensing boiler; it's just a modulating (variable output) combi boiler.

The GC number is on the front cover of the Installation Manual, or on the boiler's data plate.

Always nice to know what the white box is called!

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