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Thread: Leaving a Rheem propane heater on after pump shuts off

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    Leaving a Rheem propane heater on after pump shuts off

    I accidently left my Rheem pool heater on after I went to bed last night. My pump is on a timer and shuts off at 11pm but I wasn't awake to turn the heater off. This is one of their basic heaters (not digital) but it has an automatic shut off if water stops going through it. Could this have damaged the heater at all? I turned it off this morning but I am nervous that may have caused a problem. Thanks!
    10.5 gallon, AG, cartridge filter, 4 year old, Rheem propane heater, no water restrictions

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    TFP Guide

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    Re: Leaving a Rheem propane heater on after pump shuts off

    While not the best thing to do, if the safeties are all functioning as designed the heater will shut off when the pressure switch opens from the pump shutting down. This is a design feature of heaters to keep them from firing when there is no water flow. Should be no problems.
    Unknown make 18' above ground (bought used in 1999) Sparco sand filter. Hayward 100,000 BTu heater. 2 speed pump

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    Re: Leaving a Rheem propane heater on after pump shuts off

    You should have the heater wired into the timer so when the pump shuts off, the heater has no power going to it. However, keep in mind that the heater will fire back up when the timer turns the pump on.
    Paul
    http://www.gastekservices.com A word of caution: When working with gas and electrical you might want to consider a licensed contractor. Consider the value of your life and others around you. If you would like to provide a review of the help I provided, please use the following link to leave a review. gastek - Google Search,

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    Re: Leaving a Rheem propane heater on after pump shuts off

    Thanks all for putting my mind at ease!

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    carlos31820's Avatar
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    Leaving a Rheem propane heater on after pump shuts off

    As others have said, there are safety mechanisms that turn off the heater if the pump cuts off. That being said, mine did this a couple nights in a row and the water inside the exchanger would boil over and cause the drain plug to come loose and I found the pool pump had lost prime after air got in the system thru the loose drain plug.

    So now, I like to cut off the heater and let the pump run until the heater and exchanger have time to cool off.


    16x36 Vinyl Pool - 22.5K gallons.
    Jandy Stealth 1hp pump - Jandy CS-150 filter
    Jandy Legacy 250k heater - Jandy Ei SWCG
    Jandy Watercolors LED light
    Paramount Vanquish in-floor cleaner

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