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Thread: Setting desired temperature on heater

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    Setting desired temperature on heater

    I have a Hayward H350 with a knob controlled thermostat (as opposed to a digital thermostat). Yesterday I had the heater on with the knob set to about 1/3 of the way between Minimum and Maximum (what I thought was a relatively low setting). However, the pool had reached a temperature of 78 degrees and the heater was still running. My question is: does anybody know, approximately what different positions of the knob equate to in pool temperature? For example does Minimum = 70 degrees and Maximum = 90 degrees or something like that?
    25K Gal, IG gunite, Hayward 1HP pump, Hayward DE filter, Pentair Mastertemp 250, TF100 test kit

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    JasonLion's Avatar
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    May 2007
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    Re: Setting desired temperature on heater

    Welcome to TFP!

    Maximum is going to be over 100, and minimum is going to be down around 60. The knobs vary somewhat from heater to heater. The best way to figure it out is to turn the knob up fairly far, wait till the pool gets to the temperature you want, and then turn the know down slowly until the heater turns off. Of course you have to be around paying attention to the water temperature if you are trying this.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Re: Setting desired temperature on heater

    The temp control makes a "click" when you've passed the current water temp when going from min to max - if you dial down to min and slowly turn the knob, you'll hear the click as that switch closes - use that position as a base point for adjusting the position of the dial 8)

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    -Ted

    Having done construction and service for 4 pool companies in 4 states starting in 1988, what I know about pools could fill a couple of books - what I don't know could fill a couple of libraries :-D

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