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What is ideal pump size for Vaillant ecoTEC Plus15kW Heat Only Boiler?

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R

raidac

Feb 10, 2023
16
1
3
London
Member Type
Heating Engineer (Has GSR)
What is the ideal pump size for Vaillant ecoTEC Plus 400 15kW Heat Only Boiler? The property is a studio with 1 large room, a small kitchen and a small bathroom.
I've been advised to use Grundfos UPS3 15-50/65-130.
 
Off the sound of it I would say 15/50. Not seen it obviously and the boiler isn't what I would go off.
 

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