Discuss Does combi boiler need an external pump or not? in the Central Heating Forum area at PlumbersForums.net

K

Krzysztof

My conventional boiler needs to be replaced. One engineer suggested combi with an external pump because water pressure in my flat is low, the other said there's no need for a pump. He even said that if the pump would have a detrimental effect on the boiler. Who is right?
 
What’s the water pressure and flow rate of the cold mains ?
 
One of the engineers checked and said it's 2 bars cold water, flow 4l per minute.

Not enough for a combi or unvented what water main do you have eg is it a blue one or an old lead / steel pipe one ?
 

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