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help with new bathroom and towel radiator

 
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Last Post by JamesPa 17 hours ago
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 AdamK
(@adamk)
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Topic starter 17/03/2025 12:37 pm  

having a big renovation of the house so getting a heat pump in at the same time, but ive got a problem room. weve created a new bath/util room with a dedicated plant room within it for the HW tank etc. the ceiling is insulated the floor is insulated the walls on both sides are insulated. the other 2 walls are thermal type blocks. whole room is dot and dabbed. tiny double glazed window 400x800. heat loss for the whole area is 593W for just the actual area that is the bath/util its about 492W. im struggling to find a stainless steel towel rad that will fit in the 550Wx2300H wall that can manage much more than 250W at the 40c design flow. dont want to use underfloor and floors tiled now anyway. dont want to use normal rads if possible as they tend to rust. the main flow and return 28mm's to the house are running in the ceiling void so might help with some heat into the room?

ideas?

This topic was modified 21 hours ago 3 times by AdamK

   
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 Old_Scientist
(@old_scientist)
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17/03/2025 2:20 pm  

Can you include the heat loss from the plant in the calculations, as these may help you meet the heat loss for the room? A DHW tank can lose (emit) 100W per hour, and a volumiser 50W, not to mention uninsulated pipework.

This post was modified 20 hours ago by Old_Scientist

   
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 JamesPa
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17/03/2025 4:50 pm  

Posted by: @adamk
↑

having a big renovation of the house so getting a heat pump in at the same time, but ive got a problem room. weve created a new bath/util room with a dedicated plant room within it for the HW tank etc. the ceiling is insulated the floor is insulated the walls on both sides are insulated. the other 2 walls are thermal type blocks. whole room is dot and dabbed. tiny double glazed window 400x800. heat loss for the whole area is 593W for just the actual area that is the bath/util its about 492W. im struggling to find a stainless steel towel rad that will fit in the 550Wx2300H wall that can manage much more than 250W at the 40c design flow. dont want to use underfloor and floors tiled now anyway. dont want to use normal rads if possible as they tend to rust. the main flow and return 28mm's to the house are running in the ceiling void so might help with some heat into the room?

ideas?

I persuaded my installer that heat loss from the adjacent hallway plus steam when you actually take a bath/shower was sufficient (in order that we didn't have to replace an existing towel rail).  In practice its true!

 

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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