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Bathroom Radiator replacement

 
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Last Post by Mars 3 weeks ago
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 Alfapat
(@alfapat)
Reputable Member Member
Joined: 2 years ago
Posts: 163
Topic starter 15/04/2025 9:15 am  

I need to replace a 600 x 1200 double panel radiator as it leeks a little with a vertical towel and heat radiator . How do I compare an old radiator to this , is it by the amount of BTU'S they emit ?


   
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 JamesPa
(@jamespa)
Illustrious Member Moderator
Joined: 2 years ago
Posts: 2418
15/04/2025 9:43 am  

Posted by: @alfapat
↑

I need to replace a 600 x 1200 double panel radiator as it leeks a little with a vertical towel and heat radiator . How do I compare an old radiator to this , is it by the amount of BTU'S they emit ?

Thats the main consideration.   You need to calculate btu or kW at your design flow temperature and compare with the room heat loss.  Towel rails emit very little heat so you are unlikely to match the output of a panel radiator.

 

4kW peak of solar PV since 2011; EV and a 1930s house which has been partially renovated to improve its efficiency. 7kW Vaillant heat pump.


   
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 Alfapat
(@alfapat)
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Joined: 2 years ago
Posts: 163
Topic starter 15/04/2025 11:08 am  

OK , Thanks James, can the btu's be calculated from the existing Radiator as it was measured to size for that room initially.

By the way I have a plumber / heat engineer the create a volumizer out of buffer and remove excess pumps and sort the pipework , at last!


   
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 JamesPa
(@jamespa)
Illustrious Member Moderator
Joined: 2 years ago
Posts: 2418
15/04/2025 11:15 am  

Posted by: @alfapat
↑

OK , Thanks James, can the btu's be calculated from the existing Radiator as it was measured to size for that room initially.

By the way I have a plumber / heat engineer the create a volumizer out of buffer and remove excess pumps and sort the pipework , at last!

Yes.  Just find any radiator catalogue eg myson or stelrad and look it up.  This will give you W at a DT of 50C between flow temp and room.  To convert to W at whatever your design ft is, use output proportional to DT raised to the power 1.3. 

Alternatively you can just look for another rad with the same output at DT50, but you are unlikely to find a towel rail that does this.

 

4kW peak of solar PV since 2011; EV and a 1930s house which has been partially renovated to improve its efficiency. 7kW Vaillant heat pump.


   
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Mars
 Mars
(@editor)
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Joined: 4 years ago
Posts: 3185
15/04/2025 11:24 am  

@rob-nezard can you please offer your professional advice on this subject?

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