Correct size of radiator for BTU calculations

[Glasgowman]

Hi I’ve done a BTU room calculator, going by the calculations I need a radiator 6407 BTU, and 1877 watts. I’ve found a radiator just over these calculations at 6581 but in the description delta T65 is 6581. Delta T50 is 4695. Delta T30 is 2433. I have a recently fitted combi boiler. Would this radiator be fine for my room? Or do I need the T50 readings to be the same as my room calculation? Thanks for any help 👍🏻

 

[ShaunCorbs]

Needs to be dt34 or dt29

So dt50 size would be 10.5k btu

 

[Glasgowman]

Needs to be dt34 or dt29

So dt50 size would be 10.5k btu

So would the one above not be sufficient for my room?

If I calculate my room at 6407, what reading of radiator should I be looking to buy?

I’m pretty confused as tried a few different calculators and they’ve all gave me totally different readings ranging from 3000 to 6000. Thanks

 

[Glasgowman]

Needs to be dt34 or dt29

So dt50 size would be 10.5k btu

Should I be looking for a rad with (delta t50 10.5btu readings) even though the calculator says I need 6407btu? Cheers

 

[ShaunCorbs]

Should I be looking for a rad with (delta t50 10.5btu readings) even though the calculator says I need 6407btu? Cheers

Yes output at dt50 of 10500btu / 3kw

Problem is that doesn’t take in your flow and return temperatures that’s just your heat loss

Dt50 is for an old school boiler high temperature eg 75-80c

As you have a condensing boiler your temperature will be 60-65c

 

[Glasgowman]

If the calculator says I need 6407, why would I choose one higher than that?

Yes output at dt50 of 10500btu / 3kw

Problem is that doesn’t take in your flow and return temperatures that’s just your heat loss

Dt50 is for an old school boiler high temperature eg 75-80c

As you have a condensing boiler your temperature will be 60-65c

 

[ShaunCorbs]

If the calculator says I need 6407, why would I choose one higher than that?

Because your emitter size is different to your Heatloss

As you know the heat output varies with different mwt/at-dt

Condensing boilers need a dt 34 max else you won’t have any efficiency/ energy savings and will decrease the boiler life

If you want a good read have a look at part L

 

[Glasgowman]

Because your emitter size is different to your Heatloss

As you know the heat output varies with different mwt/at-dt

Condensing boilers need a dt 34 max else you won’t have any efficiency/ energy savings and will decrease the boiler life

If you want a good read have a look at part L

Would you have a link for a vertical radiator that’s 10,500 btu, I can’t seem to find any that’s at 10.5 btu at dt50. Thanks for the quick reply’s 👍🏻

 

[ShaunCorbs]

Would you have a link for a vertical radiator that’s 10,500 btu, I can’t seem to find any that’s at 10.5 btu at dt50. Thanks for the quick reply’s 👍🏻

https://www.stelrad.com/radiators/vertical-radiators/compact-vertical/

 

[Glasgowman]

https://www.stelrad.com/radiators/vertical-radiators/compact-vertical/

These only seem to range between 5,405 – 8,107 btu

 

[ShaunCorbs]

These only seem to range between 5,405 – 8,107 btu

2m x 700 k2

 

[Glasgowman]

2m x 700 k2

Great thanks 👍🏻