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    nicki222's Avatar
    nicki222 Posts: 1, Reputation: 1
    New Member

    Feb 1, 2015, 10:36 AM
    I want to calculate central heating pump size.
    I have thirteen radiators so I need to know what size pump I need. Not all the radiators are getting hot. Some staying cold.
    ma0641's Avatar
    ma0641 Posts: 15,681, Reputation: 1012
    Uber Member

    Feb 1, 2015, 11:07 AM
    Pretty difficult to tell you when we have no idea as to the capacity, climate, insulation etc. Is your boiler adequate-first thing to check? Bled all the system? Could be corrosion in the piping is restricting the flow. One floor or many as that influences design pressure? Suggest a good local HVAC person.
    Grady White's Avatar
    Grady White Posts: 1,417, Reputation: 59
    Ultra Member

    Feb 2, 2015, 03:11 PM
    I seriously doubt the pump is the problem. We are talking about a hot water boiler, are we not?

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