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Thread: Pentair Thermalflo 900 Heat Pump cracked water coil

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    Join Date
    Aug 2008
    Rochester, NY

    Pentair Thermalflo 900 Heat Pump cracked water coil

    Hi. We just opened our 20000 gallon inground pool. Everything went fine until I turned on the pump. It appears that the titanium water coil in the Heat pump is cracked or has holes in it. I assume that some water got in it during the brutally cold northeast winter we had and did the damage. Has anyone else ever experienced this? I was very careful about blowing out the lines and disconnecting the input and discharge pipes per manufacturers instructions (for drainage). It looks to be about a $1000 part. I'm pretty handy but am not sure if this is a DIY project. The heat pump was put in new in 2008. There is no bypass for the heater so we are "dead in the water" until this gets fixed. Thank you for any help.
    20000 gal IG freeform, vinyl, Pentair Sand Dollar filter, Pentair 2 speed pump, Pentair Intellitouch controller, Pentair Heat Pump. Built 2008

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    Mod Squad tim5055's Avatar
    Join Date
    May 2014
    Columbia, SC

    Re: Pentair Thermalflo 900 Heat Pump cracked water coil

    While you don't have a bypass now, can you plumb one in easily? A repair like that could take a while and you really don't want to be dead in the water that long.
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    Mod Squad Patrick_B's Avatar
    Join Date
    Jun 2011

    Re: Pentair Thermalflo 900 Heat Pump cracked water coil

    I agree, and this is one reason I wanted a bypass. If you can't get this fixed ASAP, I suggest the same as Tim.
    TFP Moderator
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