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    Is my GPM too high for pool heater?

    I have a pump (cannot adjust RPM) that is pumping around 150GPM to my 5000 gallon pool. I have a 110V 20K BTU water heater that says it’s minimum GPM is 23. It doesn’t give a maximum but I’m not seeing any lift in temperature. Is my pump running too fast for it?
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    Don’t know what I’m doing!

    Hi all - just found this forum and I’m reading more than I did in college! I’m new to this but really want a beautiful sparkly blue pool. Determined to get there. I have a 10x20 oval above ground pool so somewhere around 4,500 gallons. I have it set up with a proper pump and sand filter. Just...