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Need some help with choosing the right Rads

 
Air Source Heat Pumps (ASHPs)
Last Post by JamesPa 2 hours ago
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 Renewables345
(@renewables345)
Eminent Member Member
Joined: 5 months ago
Posts: 7
Topic starter 24/02/2026 11:36 am  

Hi all,

 

I've got an installation coming up of a Warmflow Unit, and I am having some trouble with the radiators for the bathroom.

 

The heat loss is around 1.9kW. I plan to have one electric towel rad and a standard central heating rad. Does anyone have any recommendations?

 

Thanks in advance



   
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JamesPa
 JamesPa
(@jamespa)
Illustrious Member Moderator
Joined: 3 years ago
Posts: 4327
24/02/2026 11:53 am  

Posted by: @renewables345
↑

Hi all,

 

I've got an installation coming up of a Warmflow Unit, and I am having some trouble with the radiators for the bathroom.

 

The heat loss is around 1.9kW. I plan to have one electric towel rad and a standard central heating rad. Does anyone have any recommendations?

 

Thanks in advance

Wow, thats a big (or very poorly insulated) bathroom.  Are you sure its that much?

As I'm sure you know radiator output and thus selection depends on the design flow temperature so without that its impossible to say.  For example a radiator that is rated at 1kW at the standard 50C difference between rad and room (eg flow temp 75, return 65), will emit only 360W at a more typical heat pump flow temp of 45 and return temp 40.

Whats your design FT?  You may struggle to find a radiator, other than a large type 33, that will do 1.9kW at 45.  I had a similar requirement in my lounge area and ended up with a (very satisfactory) fancoil because a passive radiator with that capacity just wouldn't fit.

 


This post was modified 2 hours ago 2 times by JamesPa

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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