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Thread: in ground spa won't heat up

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    in ground spa won't heat up

    Split by moderator from HERE. Please start your own thread with your own questions. Thanks, jblizzle.

    I'm going through this now. I have a 400 gallon in ground hot tub. I configured my hot tub so that is can run with the pool or by itself. I bought a 5.5 kw spa-pak from rheem. According to mfg specs the hot tub should heat up 5 degrees every hour. Starting off my hot tub is at 70 degrees. The first two hours the hot tub increases 5 degrees an hour as stated in the mfg specs. From there it tapers off. The third hour it increases 2 degrees, the 4th hour another 2 degrees. The next 6 hours it only increased to 2 hours.

    1st hour 70 - 75
    2nd hour 75-80
    3rd hour 80 - 82
    4th hour 82-84
    The temperature only went up to 2 degrees over the next 6 hours to 86. A couple of factors I want to mention.

    1. The heater is located near the pump which is about 15 feet from the hot tub.
    2. Outside temperature in south Louisiana at the time was 74 degrees
    3. I do not have a cover
    4. It is an in-ground hot tub with over flow. However, I'm able to isolate the pump to just the spa when I run the heater.

    I'm currently testing with a makeshift cover and will post the results.

    I'm thinking that the distance from the heater to the hot tub is reason for most of heat loss but I'm still in the investigating mode.
    50 gallon bathtub, white fiberglass. Single drain. Faucet and "rain" feature. Elbow grease cleaning system.

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    Re: in ground spa - heater question

    Update to my previous question. The makeshift cover increased the temperature but it still takes a long time to heat up.
    50 gallon bathtub, white fiberglass. Single drain. Faucet and "rain" feature. Elbow grease cleaning system.

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    Mod Squad jblizzle's Avatar
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    Re: in ground spa - heater question

    Seems odd. Just to be sure, you do have full suction and return only in the spa right? Nothing mixing with the cooler pool water?
    Jason, TFP Moderator
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    Re: in ground spa - heater question

    I do have full suction. However, I believe my deep end skimmer is introducing cooler water from the pool to the hot tub. I believe this is happening because the skimmer's valve keeps turning when I'm trying to turn it off. In other words I can continue to turn it towards the off position without it tightening. Also, water is overflowing from the spa to the pool at a very slow rate. This is a pretty good indication that I'm not only pulling water from the hot tub but also from the pool. I'm going to replace the valves this week. In addition I'm going to order a cover. I feel pretty good that this will fix my problem.

    I'll keep you informed.

    Thanks.
    50 gallon bathtub, white fiberglass. Single drain. Faucet and "rain" feature. Elbow grease cleaning system.

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    Mod Squad jblizzle's Avatar
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    Re: in ground spa won't heat up

    If water is spilling over, then you are certainly still pulling in cold pool water and that is your problem. What kind of valves do you have? The pool valves (like Neverlube) are much better than the cheap PVC ball valves which can fail.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

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