I am looking to replace a faulty Grundfos central heating pump being a TOTAL novice would really appreciate some advice. Pump is a 15/50 pump but is a class F showing various pumping rates 1800rpm, 1150rpm,etc. I can find 15/50 pumps on line but class H with varying pump rates and also class F's with again varying pump rates. Is this such a big deal or can I buy any class F or class H? Any help/advice would be appreciated.
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