BTU room calculation

[Glasgowman]

Sorry I’ve posted about this before but now ready to order a radiator. These are 2 different calculations from 2 different sites. BTU 6005 from one site. BTU 4829 from another site, 4829 went through a lot more thorough questions, so I’m guessing the 4829 BTU is correct over the 6005.

 

[Glasgowman]

Would this type of BTU/ watts be ok to fit or would I be looking at a lower reading or higher reading thanks. The photo only shows T30 T50. But the first photos shows that I’m T40. Any help would be great as looking to order tonight 🙏🏻

 

[Glasgowman]

Would this type of BTU/ watts be ok to fit or would I be looking at a lower reading or higher reading thanks. The photo only shows T30 T50. But the first photos shows that I’m T40. Any help would be great as looking to order tonight 🙏🏻

This rad has a max output of BTU 6250 at T50

 

[Glasgowman]

Any help please on what type of BTU output I should be ordering for 4829 BTU reading thanks

 

[ShaunCorbs]

What boiler do you have ?

 

[Glasgowman]

It’s a Vokera combi mate

 

[Glasgowman]

Checked online and says I should calculate my reading T40 at btu 4829 and x it by 1.33 giving me btu reading 6422 at T50 that I should be looking for, would just like to know this is correct before ordering thanks

 

[ShaunCorbs]

It’s a Vokera combi mate

Dt30 then

To convert to dt50

30/50 xy 1.3 = 0.514

1600 / 0.514 =3,112.84w at dt50

 

[Glasgowman]

Would any of these be suitable? This is the style of radiator I’m trying to keep throughout. And the more expensive out the 2 is the biggest size it’ll go? Cheers for all your help 👍🏻

 

[ShaunCorbs]

Sorry to say no would need two

 

[Glasgowman]

Sorry to say no would need two

Would the new rad btu at dt50 7500 not be ok if the online calculator gave me my heat requirement Btu at dt40 4829? Thanks again

 

[ShaunCorbs]

Would the new rad btu at dt50 7500 not be ok if the online calculator gave me my heat requirement Btu at dt40 4829? Thanks again

That’s only 2.1kw when you need 3.1kw

 

[Glasgowman]

That’s only 2.1kw when you need 3.1kw

Ok. I just don’t understand why the online calculation says x’s the btu or the watts by 1.3 and that will give you the online calculation from T40 to T50 in BTU and Watts

 

[Glasgowman]

Ok. I just don’t understand why the online calculation says x’s the btu or the watts by 1.3 and that will give you the online calculation from T40 to T50 in BTU and Watts

I take it this isn’t correct?

 

[ShaunCorbs]

I take it this isn’t correct?

Correct needs to be xy 1.3 eg

40/50 xy 1.3 that gives you your conversion factor eg 0.748

So 1600 / 0.748 =2,139.0374w at dt50

 

[Glasgowman]

Correct needs to be xy 1.3 eg

40/50 xy 1.3 that gives you your conversion factor eg 0.748

So 1600 / 0.748 =2,139.0374w at dt50

Or could I try match the output from my old rad. Would that be easier for me and might not need the calculation that I done online?

 

[Last Plumber]

What temperature are you running you heating system at? What is the boiler flow temperature set to?

 

[Glasgowman]

What temperature are you running you heating system at? What is the boiler flow temperature set to?

Not sure if this will help

 

[Last Plumber]

Not sure if this will help

No Not really, I can't see where it is set. I was really looking for a temperature.

 

[ShaunCorbs]

Or could I try match the output from my old rad. Would that be easier for me and might not need the calculation that I done online?

What size rad and what type of?

 

[Glasgowman]

What size rad and what type of?

It was 600mm by 1200mm a double radiator type 22. Room is 7.2L /2.6W /2.6H with 8sqm of double glazing with plastic trim

 

[ShaunCorbs]

It was 600mm by 1200mm a double radiator type 22. Room is 7.2L /2.6W /2.6H with 8sqm of double glazing with plastic trim

2.1kw at dt 50

 

[Glasgowman]

2.1kw at dt 50

Thanks for your help 👍🏻

 

[PlumbAdvice]

Sorry I’ve posted about this before but now ready to order a radiator. These are 2 different calculations from 2 different sites. BTU 6005 from one site. BTU 4829 from another site, 4829 went through a lot more thorough questions, so I’m guessing the 4829 BTU is correct over the 6005.

If the radiator is slightly oversized it should not a problem as the controls for the heating system will restrict heat when the conditions are satisfied.

For example when your thermostat has reached the set temperature it will tell the boiler to turn off. TRV's (Thermostatic Radiator Valve) on the radiation would work on a similar controlling the heat around the radiator. When that are reaches the set temperature the valve closes.